[{"oa_version":"Published Version","date_published":"2022-09-10T00:00:00Z","publication_status":"published","doi":"10.1038/s41535-022-00496-w","intvolume":"         7","citation":{"mla":"Paerschke, Ekaterina, et al. “Evolution of Electronic and Magnetic Properties of Sr₂IrO₄ under Strain.” <i>Npj Quantum Materials</i>, vol. 7, 90, Springer Nature, 2022, doi:<a href=\"https://doi.org/10.1038/s41535-022-00496-w\">10.1038/s41535-022-00496-w</a>.","apa":"Paerschke, E., Chen, W.-C., Ray, R., &#38; Chen, C.-C. (2022). Evolution of electronic and magnetic properties of Sr₂IrO₄ under strain. <i>Npj Quantum Materials</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41535-022-00496-w\">https://doi.org/10.1038/s41535-022-00496-w</a>","ista":"Paerschke E, Chen W-C, Ray R, Chen C-C. 2022. Evolution of electronic and magnetic properties of Sr₂IrO₄ under strain. npj Quantum Materials. 7, 90.","chicago":"Paerschke, Ekaterina, Wei-Chih Chen, Rajyavardhan Ray, and Cheng-Chien Chen. “Evolution of Electronic and Magnetic Properties of Sr₂IrO₄ under Strain.” <i>Npj Quantum Materials</i>. Springer Nature, 2022. <a href=\"https://doi.org/10.1038/s41535-022-00496-w\">https://doi.org/10.1038/s41535-022-00496-w</a>.","ama":"Paerschke E, Chen W-C, Ray R, Chen C-C. Evolution of electronic and magnetic properties of Sr₂IrO₄ under strain. <i>npj Quantum Materials</i>. 2022;7. doi:<a href=\"https://doi.org/10.1038/s41535-022-00496-w\">10.1038/s41535-022-00496-w</a>","ieee":"E. Paerschke, W.-C. Chen, R. Ray, and C.-C. Chen, “Evolution of electronic and magnetic properties of Sr₂IrO₄ under strain,” <i>npj Quantum Materials</i>, vol. 7. Springer Nature, 2022.","short":"E. Paerschke, W.-C. Chen, R. Ray, C.-C. Chen, Npj Quantum Materials 7 (2022)."},"scopus_import":"1","file_date_updated":"2023-01-27T07:59:27Z","ddc":["530"],"article_number":"90","_id":"12213","date_updated":"2023-08-04T09:23:43Z","abstract":[{"text":"Motivated by properties-controlling potential of the strain, we investigate strain dependence of structure, electronic, and magnetic properties of Sr2IrO4 using complementary theoretical tools: ab-initio calculations, analytical approaches (rigid octahedra picture, Slater-Koster integrals), and extended t−J model. We find that strain affects both Ir-Ir distance and Ir-O-Ir angle, and the rigid octahedra picture is not relevant. Second, we find fundamentally different behavior for compressive and tensile strain. One remarkable feature is the formation of two subsets of bond- and orbital-dependent carriers, a compass-like model, under compression. This originates from the strain-induced renormalization of the Ir-O-Ir superexchange and O on-site energy. We also show that under compressive (tensile) strain, Fermi surface becomes highly dispersive (relatively flat). Already at a tensile strain of 1.5%, we observe spectral weight redistribution, with the low-energy band acquiring almost purely singlet character. These results can be directly compared with future experiments.","lang":"eng"}],"year":"2022","month":"09","ec_funded":1,"status":"public","publication_identifier":{"eissn":["2397-4648"]},"oa":1,"type":"journal_article","language":[{"iso":"eng"}],"department":[{"_id":"MiLe"}],"has_accepted_license":"1","date_created":"2023-01-16T09:46:01Z","publication":"npj Quantum Materials","external_id":{"isi":["000852381200003"]},"volume":7,"quality_controlled":"1","keyword":["Condensed Matter Physics","Electronic","Optical and Magnetic Materials"],"related_material":{"link":[{"url":"https://doi.org/10.1038/s41535-022-00510-1","relation":"erratum"}]},"article_type":"original","article_processing_charge":"No","project":[{"call_identifier":"H2020","name":"ISTplus - Postdoctoral Fellowships","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425"}],"isi":1,"author":[{"first_name":"Ekaterina","orcid":"0000-0003-0853-8182","id":"8275014E-6063-11E9-9B7F-6338E6697425","last_name":"Paerschke","full_name":"Paerschke, Ekaterina"},{"first_name":"Wei-Chih","last_name":"Chen","full_name":"Chen, Wei-Chih"},{"first_name":"Rajyavardhan","last_name":"Ray","full_name":"Ray, Rajyavardhan"},{"first_name":"Cheng-Chien","last_name":"Chen","full_name":"Chen, Cheng-Chien"}],"file":[{"access_level":"open_access","creator":"dernst","file_id":"12414","checksum":"d93b477b5b95c0d1b8f9fef90a81f565","date_created":"2023-01-27T07:59:27Z","file_name":"2022_NPJ_Paerschke.pdf","date_updated":"2023-01-27T07:59:27Z","file_size":1852598,"success":1,"relation":"main_file","content_type":"application/pdf"}],"acknowledgement":"E.M.P. thanks Eugenio Paris, Thorsten Schmitt, Krzysztof Wohlfeld, and other coauthors for an inspiring previous collaboration23, and is grateful to Gang Cao, Ambrose Seo, and Jungho Kim for insightful discussions. R.R. acknowledges helpful discussion with Sanjeev Kumar and Manuel Richter. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 754411. C.C.C. acknowledges support from the U.S. National Science Foundation Award No. DMR-2142801.","day":"10","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publisher":"Springer Nature","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","title":"Evolution of electronic and magnetic properties of Sr₂IrO₄ under strain"},{"date_created":"2022-09-08T15:01:16Z","publication":"Physical Review Research","has_accepted_license":"1","language":[{"iso":"eng"}],"type":"journal_article","article_type":"original","article_processing_charge":"No","volume":3,"quality_controlled":"1","day":"27","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"extern":"1","file":[{"date_created":"2022-09-09T07:23:40Z","file_name":"2021_PhysicalRevResearch_Sun.pdf","date_updated":"2022-09-09T07:23:40Z","access_level":"open_access","creator":"dernst","checksum":"73f1331b9716295849e87a7d3acd9323","file_id":"12075","file_size":4020901,"success":1,"content_type":"application/pdf","relation":"main_file"}],"author":[{"last_name":"Sun","first_name":"Zhixiang","full_name":"Sun, Zhixiang"},{"full_name":"Guevara, Jose M.","first_name":"Jose M.","last_name":"Guevara"},{"first_name":"Steffen","last_name":"Sykora","full_name":"Sykora, Steffen"},{"last_name":"Paerschke","id":"8275014E-6063-11E9-9B7F-6338E6697425","orcid":"0000-0003-0853-8182","first_name":"Ekaterina","full_name":"Paerschke, Ekaterina"},{"first_name":"Kaustuv","last_name":"Manna","full_name":"Manna, Kaustuv"},{"last_name":"Maljuk","first_name":"Andrey","full_name":"Maljuk, Andrey"},{"full_name":"Wurmehl, Sabine","last_name":"Wurmehl","first_name":"Sabine"},{"full_name":"van den Brink, Jeroen","last_name":"van den Brink","first_name":"Jeroen"},{"last_name":"Büchner","first_name":"Bernd","full_name":"Büchner, Bernd"},{"first_name":"Christian","last_name":"Hess","full_name":"Hess, Christian"}],"title":"Evidence for a percolative Mott insulator-metal transition in doped Sr₂IrO₄","publisher":"American Physical Society","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_status":"published","doi":"10.1103/physrevresearch.3.023075","date_published":"2021-04-27T00:00:00Z","oa_version":"Published Version","ddc":["530"],"file_date_updated":"2022-09-09T07:23:40Z","scopus_import":"1","citation":{"ista":"Sun Z, Guevara JM, Sykora S, Paerschke E, Manna K, Maljuk A, Wurmehl S, van den Brink J, Büchner B, Hess C. 2021. Evidence for a percolative Mott insulator-metal transition in doped Sr₂IrO₄. Physical Review Research. 3(2), 023075.","apa":"Sun, Z., Guevara, J. M., Sykora, S., Paerschke, E., Manna, K., Maljuk, A., … Hess, C. (2021). Evidence for a percolative Mott insulator-metal transition in doped Sr₂IrO₄. <i>Physical Review Research</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevresearch.3.023075\">https://doi.org/10.1103/physrevresearch.3.023075</a>","mla":"Sun, Zhixiang, et al. “Evidence for a Percolative Mott Insulator-Metal Transition in Doped Sr₂IrO₄.” <i>Physical Review Research</i>, vol. 3, no. 2, 023075, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/physrevresearch.3.023075\">10.1103/physrevresearch.3.023075</a>.","chicago":"Sun, Zhixiang, Jose M. Guevara, Steffen Sykora, Ekaterina Paerschke, Kaustuv Manna, Andrey Maljuk, Sabine Wurmehl, Jeroen van den Brink, Bernd Büchner, and Christian Hess. “Evidence for a Percolative Mott Insulator-Metal Transition in Doped Sr₂IrO₄.” <i>Physical Review Research</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/physrevresearch.3.023075\">https://doi.org/10.1103/physrevresearch.3.023075</a>.","ieee":"Z. Sun <i>et al.</i>, “Evidence for a percolative Mott insulator-metal transition in doped Sr₂IrO₄,” <i>Physical Review Research</i>, vol. 3, no. 2. American Physical Society, 2021.","ama":"Sun Z, Guevara JM, Sykora S, et al. Evidence for a percolative Mott insulator-metal transition in doped Sr₂IrO₄. <i>Physical Review Research</i>. 2021;3(2). doi:<a href=\"https://doi.org/10.1103/physrevresearch.3.023075\">10.1103/physrevresearch.3.023075</a>","short":"Z. Sun, J.M. Guevara, S. Sykora, E. Paerschke, K. Manna, A. Maljuk, S. Wurmehl, J. van den Brink, B. Büchner, C. Hess, Physical Review Research 3 (2021)."},"intvolume":"         3","year":"2021","date_updated":"2022-09-09T07:26:01Z","abstract":[{"lang":"eng","text":"Despite many efforts to rationalize the strongly correlated electronic ground states in doped Mott insulators, the nature of the doping-induced insulator-to-metal transition is still a subject under intensive investigation. Here, we probe the nanoscale electronic structure of the Mott insulator Sr₂IrO₄δ with low-temperature scanning tunneling microscopy and find an enhanced local density of states (LDOS) inside the Mott gap at the location of individual defects which we interpret as defects at apical oxygen sites. A chiral behavior in the topography for those defects has been observed. We also visualize the local enhanced conductance arising from the overlapping of defect states which induces finite LDOS inside of the Mott gap. By combining these findings with the typical spatial extension of isolated defects of about 2 nm, our results indicate that the insulator-to-metal transition in Sr₂IrO₄−δ could be percolative in nature."}],"issue":"2","_id":"12071","article_number":"023075","oa":1,"publication_identifier":{"issn":["2643-1564"]},"status":"public","month":"04"},{"_id":"8699","year":"2020","date_updated":"2023-08-22T12:11:52Z","issue":"40","abstract":[{"lang":"eng","text":"In the high spin–orbit-coupled Sr2IrO4, the high sensitivity of the ground state to the details of the local lattice structure shows a large potential for the manipulation of the functional properties by inducing local lattice distortions. We use epitaxial strain to modify the Ir–O bond geometry in Sr2IrO4 and perform momentum-dependent resonant inelastic X-ray scattering (RIXS) at the metal and at the ligand sites to unveil the response of the low-energy elementary excitations. We observe that the pseudospin-wave dispersion for tensile-strained Sr2IrO4 films displays large softening along the [h,0] direction, while along the [h,h] direction it shows hardening. This evolution reveals a renormalization of the magnetic interactions caused by a strain-driven cross-over from anisotropic to isotropic interactions between the magnetic moments. Moreover, we detect dispersive electron–hole pair excitations which shift to lower (higher) energies upon compressive (tensile) strain, manifesting a reduction (increase) in the size of the charge gap. This behavior shows an intimate coupling between charge excitations and lattice distortions in Sr2IrO4, originating from the modified hopping elements between the t2g orbitals. Our work highlights the central role played by the lattice degrees of freedom in determining both the pseudospin and charge excitations of Sr2IrO4 and provides valuable information toward the control of the ground state of complex oxides in the presence of high spin–orbit coupling."}],"arxiv":1,"ec_funded":1,"month":"10","oa":1,"publication_identifier":{"issn":["00278424"],"eissn":["10916490"]},"status":"public","date_published":"2020-10-06T00:00:00Z","oa_version":"Published Version","publication_status":"published","doi":"10.1073/pnas.2012043117","intvolume":"       117","citation":{"chicago":"Paris, Eugenio, Yi Tseng, Ekaterina Paerschke, Wenliang Zhang, Mary H Upton, Anna Efimenko, Katharina Rolfs, et al. “Strain Engineering of the Charge and Spin-Orbital Interactions in Sr2IrO4.” <i>Proceedings of the National Academy of Sciences of the United States of America</i>. National Academy of Sciences, 2020. <a href=\"https://doi.org/10.1073/pnas.2012043117\">https://doi.org/10.1073/pnas.2012043117</a>.","apa":"Paris, E., Tseng, Y., Paerschke, E., Zhang, W., Upton, M. H., Efimenko, A., … Schmitt, T. (2020). Strain engineering of the charge and spin-orbital interactions in Sr2IrO4. <i>Proceedings of the National Academy of Sciences of the United States of America</i>. National Academy of Sciences. <a href=\"https://doi.org/10.1073/pnas.2012043117\">https://doi.org/10.1073/pnas.2012043117</a>","ista":"Paris E, Tseng Y, Paerschke E, Zhang W, Upton MH, Efimenko A, Rolfs K, McNally DE, Maurel L, Naamneh M, Caputo M, Strocov VN, Wang Z, Casa D, Schneider CW, Pomjakushina E, Wohlfeld K, Radovic M, Schmitt T. 2020. Strain engineering of the charge and spin-orbital interactions in Sr2IrO4. Proceedings of the National Academy of Sciences of the United States of America. 117(40), 24764–24770.","mla":"Paris, Eugenio, et al. “Strain Engineering of the Charge and Spin-Orbital Interactions in Sr2IrO4.” <i>Proceedings of the National Academy of Sciences of the United States of America</i>, vol. 117, no. 40, National Academy of Sciences, 2020, pp. 24764–70, doi:<a href=\"https://doi.org/10.1073/pnas.2012043117\">10.1073/pnas.2012043117</a>.","ama":"Paris E, Tseng Y, Paerschke E, et al. Strain engineering of the charge and spin-orbital interactions in Sr2IrO4. <i>Proceedings of the National Academy of Sciences of the United States of America</i>. 2020;117(40):24764-24770. doi:<a href=\"https://doi.org/10.1073/pnas.2012043117\">10.1073/pnas.2012043117</a>","ieee":"E. Paris <i>et al.</i>, “Strain engineering of the charge and spin-orbital interactions in Sr2IrO4,” <i>Proceedings of the National Academy of Sciences of the United States of America</i>, vol. 117, no. 40. National Academy of Sciences, pp. 24764–24770, 2020.","short":"E. Paris, Y. Tseng, E. Paerschke, W. Zhang, M.H. Upton, A. Efimenko, K. Rolfs, D.E. McNally, L. Maurel, M. Naamneh, M. Caputo, V.N. Strocov, Z. Wang, D. Casa, C.W. Schneider, E. Pomjakushina, K. Wohlfeld, M. Radovic, T. Schmitt, Proceedings of the National Academy of Sciences of the United States of America 117 (2020) 24764–24770."},"ddc":["530"],"file_date_updated":"2020-10-28T11:53:12Z","scopus_import":"1","file":[{"file_size":1176522,"success":1,"relation":"main_file","content_type":"application/pdf","date_created":"2020-10-28T11:53:12Z","file_name":"2020_PNAS_Paris.pdf","date_updated":"2020-10-28T11:53:12Z","access_level":"open_access","creator":"cziletti","file_id":"8715","checksum":"1638fa36b442e2868576c6dd7d6dc505"}],"project":[{"name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425"}],"isi":1,"author":[{"full_name":"Paris, Eugenio","first_name":"Eugenio","last_name":"Paris"},{"first_name":"Yi","last_name":"Tseng","full_name":"Tseng, Yi"},{"orcid":"0000-0003-0853-8182","first_name":"Ekaterina","id":"8275014E-6063-11E9-9B7F-6338E6697425","last_name":"Paerschke","full_name":"Paerschke, Ekaterina"},{"full_name":"Zhang, Wenliang","last_name":"Zhang","first_name":"Wenliang"},{"first_name":"Mary H","last_name":"Upton","full_name":"Upton, Mary H"},{"full_name":"Efimenko, Anna","last_name":"Efimenko","first_name":"Anna"},{"full_name":"Rolfs, Katharina","last_name":"Rolfs","first_name":"Katharina"},{"first_name":"Daniel E","last_name":"McNally","full_name":"McNally, Daniel E"},{"full_name":"Maurel, Laura","first_name":"Laura","last_name":"Maurel"},{"last_name":"Naamneh","first_name":"Muntaser","full_name":"Naamneh, Muntaser"},{"last_name":"Caputo","first_name":"Marco","full_name":"Caputo, Marco"},{"first_name":"Vladimir N","last_name":"Strocov","full_name":"Strocov, Vladimir N"},{"full_name":"Wang, Zhiming","last_name":"Wang","first_name":"Zhiming"},{"first_name":"Diego","last_name":"Casa","full_name":"Casa, Diego"},{"full_name":"Schneider, Christof W","last_name":"Schneider","first_name":"Christof W"},{"full_name":"Pomjakushina, Ekaterina","first_name":"Ekaterina","last_name":"Pomjakushina"},{"full_name":"Wohlfeld, Krzysztof","last_name":"Wohlfeld","first_name":"Krzysztof"},{"full_name":"Radovic, Milan","first_name":"Milan","last_name":"Radovic"},{"last_name":"Schmitt","first_name":"Thorsten","full_name":"Schmitt, Thorsten"}],"day":"06","tmp":{"name":"Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode","short":"CC BY-NC-ND (4.0)","image":"/images/cc_by_nc_nd.png"},"acknowledgement":"We gratefully acknowledge C. Sahle for experimental support at the ID20 beamline of the ESRF. The soft X-ray experiments were carried out at the ADRESS beamline of the Swiss Light Source, Paul Scherrer Institut (PSI). E. Paris and T.S. thank X. Lu and C. Monney for valuable discussions. The work at PSI is supported by the Swiss National Science Foundation (SNSF) through Project 200021_178867, the NCCR (National Centre of Competence in Research) MARVEL (Materials’ Revolution: Computational Design and Discovery of Novel Materials) and the Sinergia network Mott Physics Beyond the Heisenberg Model (MPBH) (SNSF Research Grants CRSII2_160765/1 and CRSII2_141962). K.W. acknowledges support by the Narodowe Centrum Nauki Projects 2016/22/E/ST3/00560 and 2016/23/B/ST3/00839. E.M.P. and M.N. acknowledge funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreements 754411 and 701647, respectively. M.R. was supported by the Swiss National Science Foundation under Project 200021 – 182695. This research used resources of the APS, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract DE-AC02-06CH11357.","pmid":1,"title":"Strain engineering of the charge and spin-orbital interactions in Sr2IrO4","publisher":"National Academy of Sciences","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","language":[{"iso":"eng"}],"department":[{"_id":"MiLe"}],"type":"journal_article","page":"24764-24770","date_created":"2020-10-25T23:01:17Z","publication":"Proceedings of the National Academy of Sciences of the United States of America","has_accepted_license":"1","external_id":{"isi":["000579059100029"],"pmid":["32958669"],"arxiv":["2009.12262"]},"quality_controlled":"1","volume":117,"article_type":"original","article_processing_charge":"No"},{"article_type":"original","article_processing_charge":"No","external_id":{"arxiv":["2009.11773"]},"volume":5,"quality_controlled":"1","has_accepted_license":"1","date_created":"2020-11-06T07:21:00Z","publication":"Condensed Matter","type":"journal_article","language":[{"iso":"eng"}],"department":[{"_id":"MiLe"}],"publisher":"MDPI","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","title":"Evolution of spin-orbital entanglement with increasing ising spin-orbit coupling","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"day":"26","project":[{"name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","grant_number":"754411"}],"author":[{"full_name":"Gotfryd, Dorota","last_name":"Gotfryd","first_name":"Dorota"},{"id":"8275014E-6063-11E9-9B7F-6338E6697425","last_name":"Paerschke","first_name":"Ekaterina","orcid":"0000-0003-0853-8182","full_name":"Paerschke, Ekaterina"},{"last_name":"Wohlfeld","first_name":"Krzysztof","full_name":"Wohlfeld, Krzysztof"},{"first_name":"Andrzej M.","last_name":"Oleś","full_name":"Oleś, Andrzej M."}],"file":[{"access_level":"open_access","creator":"dernst","checksum":"a57a698ff99a11b6665bafd1bac7afbc","file_id":"8727","date_created":"2020-11-06T07:24:40Z","file_name":"2020_CondensedMatter_Gotfryd.pdf","date_updated":"2020-11-06T07:24:40Z","file_size":768336,"success":1,"content_type":"application/pdf","relation":"main_file"}],"file_date_updated":"2020-11-06T07:24:40Z","scopus_import":"1","ddc":["530"],"citation":{"chicago":"Gotfryd, Dorota, Ekaterina Paerschke, Krzysztof Wohlfeld, and Andrzej M. Oleś. “Evolution of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit Coupling.” <i>Condensed Matter</i>. MDPI, 2020. <a href=\"https://doi.org/10.3390/condmat5030053\">https://doi.org/10.3390/condmat5030053</a>.","mla":"Gotfryd, Dorota, et al. “Evolution of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit Coupling.” <i>Condensed Matter</i>, vol. 5, no. 3, 53, MDPI, 2020, doi:<a href=\"https://doi.org/10.3390/condmat5030053\">10.3390/condmat5030053</a>.","apa":"Gotfryd, D., Paerschke, E., Wohlfeld, K., &#38; Oleś, A. M. (2020). Evolution of spin-orbital entanglement with increasing ising spin-orbit coupling. <i>Condensed Matter</i>. MDPI. <a href=\"https://doi.org/10.3390/condmat5030053\">https://doi.org/10.3390/condmat5030053</a>","ista":"Gotfryd D, Paerschke E, Wohlfeld K, Oleś AM. 2020. Evolution of spin-orbital entanglement with increasing ising spin-orbit coupling. Condensed Matter. 5(3), 53.","ama":"Gotfryd D, Paerschke E, Wohlfeld K, Oleś AM. Evolution of spin-orbital entanglement with increasing ising spin-orbit coupling. <i>Condensed Matter</i>. 2020;5(3). doi:<a href=\"https://doi.org/10.3390/condmat5030053\">10.3390/condmat5030053</a>","ieee":"D. Gotfryd, E. Paerschke, K. Wohlfeld, and A. M. Oleś, “Evolution of spin-orbital entanglement with increasing ising spin-orbit coupling,” <i>Condensed Matter</i>, vol. 5, no. 3. MDPI, 2020.","short":"D. Gotfryd, E. Paerschke, K. Wohlfeld, A.M. Oleś, Condensed Matter 5 (2020)."},"intvolume":"         5","publication_status":"published","doi":"10.3390/condmat5030053","oa_version":"Published Version","date_published":"2020-08-26T00:00:00Z","status":"public","oa":1,"publication_identifier":{"issn":["2410-3896"]},"month":"08","ec_funded":1,"date_updated":"2021-01-12T08:20:46Z","arxiv":1,"issue":"3","abstract":[{"lang":"eng","text":"Several realistic spin-orbital models for transition metal oxides go beyond the classical expectations and could be understood only by employing the quantum entanglement. Experiments on these materials confirm that spin-orbital entanglement has measurable consequences. Here, we capture the essential features of spin-orbital entanglement in complex quantum matter utilizing 1D spin-orbital model which accommodates SU(2)⊗SU(2) symmetric Kugel-Khomskii superexchange as well as the Ising on-site spin-orbit coupling. Building on the results obtained for full and effective models in the regime of strong spin-orbit coupling, we address the question whether the entanglement found on superexchange bonds always increases when the Ising spin-orbit coupling is added. We show that (i) quantum entanglement is amplified by strong spin-orbit coupling and, surprisingly, (ii) almost classical disentangled states are possible. We complete the latter case by analyzing how the entanglement existing for intermediate values of spin-orbit coupling can disappear for higher values of this coupling."}],"year":"2020","article_number":"53","_id":"8726"},{"quality_controlled":"1","volume":2,"article_type":"original","article_processing_charge":"No","language":[{"iso":"eng"}],"department":[{"_id":"MiLe"}],"type":"journal_article","date_created":"2020-03-20T15:21:10Z","publication":"Physical Review Research","has_accepted_license":"1","title":"How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator","publisher":"American Physical Society","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","file":[{"access_level":"open_access","checksum":"1be551fd5f5583635076017d7391ffdc","file_id":"7610","creator":"dernst","date_created":"2020-03-23T10:18:38Z","date_updated":"2020-07-14T12:48:00Z","file_name":"2020_PhysRevResearch_Gotfryd.pdf","file_size":1436735,"relation":"main_file","content_type":"application/pdf"}],"project":[{"grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"ISTplus - Postdoctoral Fellowships"}],"author":[{"full_name":"Gotfryd, Dorota","first_name":"Dorota","last_name":"Gotfryd"},{"id":"8275014E-6063-11E9-9B7F-6338E6697425","last_name":"Paerschke","first_name":"Ekaterina","orcid":"0000-0003-0853-8182","full_name":"Paerschke, Ekaterina"},{"first_name":"Jiri","last_name":"Chaloupka","full_name":"Chaloupka, Jiri"},{"last_name":"Oles","first_name":"Andrzej M.","full_name":"Oles, Andrzej M."},{"full_name":"Wohlfeld, Krzysztof","last_name":"Wohlfeld","first_name":"Krzysztof"}],"day":"20","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"intvolume":"         2","citation":{"short":"D. Gotfryd, E. Paerschke, J. Chaloupka, A.M. Oles, K. Wohlfeld, Physical Review Research 2 (2020).","ama":"Gotfryd D, Paerschke E, Chaloupka J, Oles AM, Wohlfeld K. How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator. <i>Physical Review Research</i>. 2020;2(1). doi:<a href=\"https://doi.org/10.1103/PhysRevResearch.2.013353\">10.1103/PhysRevResearch.2.013353</a>","ieee":"D. Gotfryd, E. Paerschke, J. Chaloupka, A. M. Oles, and K. Wohlfeld, “How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator,” <i>Physical Review Research</i>, vol. 2, no. 1. American Physical Society, 2020.","chicago":"Gotfryd, Dorota, Ekaterina Paerschke, Jiri Chaloupka, Andrzej M. Oles, and Krzysztof Wohlfeld. “How Spin-Orbital Entanglement Depends on the Spin-Orbit Coupling in a Mott Insulator.” <i>Physical Review Research</i>. American Physical Society, 2020. <a href=\"https://doi.org/10.1103/PhysRevResearch.2.013353\">https://doi.org/10.1103/PhysRevResearch.2.013353</a>.","mla":"Gotfryd, Dorota, et al. “How Spin-Orbital Entanglement Depends on the Spin-Orbit Coupling in a Mott Insulator.” <i>Physical Review Research</i>, vol. 2, no. 1, 013353, American Physical Society, 2020, doi:<a href=\"https://doi.org/10.1103/PhysRevResearch.2.013353\">10.1103/PhysRevResearch.2.013353</a>.","apa":"Gotfryd, D., Paerschke, E., Chaloupka, J., Oles, A. M., &#38; Wohlfeld, K. (2020). How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator. <i>Physical Review Research</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevResearch.2.013353\">https://doi.org/10.1103/PhysRevResearch.2.013353</a>","ista":"Gotfryd D, Paerschke E, Chaloupka J, Oles AM, Wohlfeld K. 2020. How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator. Physical Review Research. 2(1), 013353."},"ddc":["530"],"file_date_updated":"2020-07-14T12:48:00Z","date_published":"2020-03-20T00:00:00Z","oa_version":"Published Version","publication_status":"published","doi":"10.1103/PhysRevResearch.2.013353","ec_funded":1,"month":"03","oa":1,"status":"public","_id":"7594","article_number":"013353","year":"2020","date_updated":"2021-01-12T08:14:23Z","issue":"1","abstract":[{"lang":"eng","text":"The concept of the entanglement between spin and orbital degrees of freedom plays a crucial role in our understanding of various phases and exotic ground states in a broad class of materials, including orbitally ordered materials and spin liquids. We investigate how the spin-orbital entanglement in a Mott insulator depends on the value of the spin-orbit coupling of the relativistic origin. To this end, we numerically diagonalize a one-dimensional spin-orbital model with Kugel-Khomskii exchange interactions between spins and orbitals on different sites supplemented by the on-site spin-orbit coupling. In the regime of small spin-orbit coupling with regard to the spin-orbital exchange, the ground state to a large extent resembles the one obtained in the limit of vanishing spin-orbit coupling. On the other hand, for large spin-orbit coupling the ground state can, depending on the model parameters, either still show negligible spin-orbital entanglement or evolve to a highly spin-orbitally-entangled phase with completely distinct properties that are described by an effective XXZ model. The presented results suggest that (i) the spin-orbital entanglement may be induced by large on-site spin-orbit coupling, as found in the 5d transition metal oxides, such as the iridates; (ii) for Mott insulators with weak spin-orbit coupling of Ising type, such as, e.g., the alkali hyperoxides, the effects of the spin-orbit coupling on the ground state can, in the first order of perturbation theory, be neglected."}]}]