{"quality_controlled":"1","title":"Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors","status":"public","oa_version":"Preprint","oa":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_created":"2020-02-02T23:01:01Z","publisher":"American Physical Society","scopus_import":"1","date_published":"2020-01-13T00:00:00Z","publication_status":"published","issue":"2","department":[{"_id":"MiLe"}],"abstract":[{"lang":"eng","text":"In the superconducting regime of FeTe(1−x)Sex, there exist two types of vortices which are distinguished by the presence or absence of zero-energy states in their core. To understand their origin, we examine the interplay of Zeeman coupling and superconducting pairings in three-dimensional metals with band inversion. Weak Zeeman fields are found to suppress intraorbital spin-singlet pairing, known to localize the states at the ends of the vortices on the surface. On the other hand, an orbital-triplet pairing is shown to be stable against Zeeman interactions, but leads to delocalized zero-energy Majorana modes which extend through the vortex. In contrast, the finite-energy vortex modes remain localized at the vortex ends even when the pairing is of orbital-triplet form. Phenomenologically, this manifests as an observed disappearance of zero-bias peaks within the cores of topological vortices upon an increase of the applied magnetic field. The presence of magnetic impurities in FeTe(1−x)Sex, which are attracted to the vortices, would lead to such Zeeman-induced delocalization of Majorana modes in a fraction of vortices that capture a large enough number of magnetic impurities. Our results provide an explanation for the dichotomy between topological and nontopological vortices recently observed in FeTe(1−x)Sex."}],"main_file_link":[{"url":"https://arxiv.org/abs/1907.02077","open_access":"1"}],"type":"journal_article","day":"13","article_processing_charge":"No","month":"01","date_updated":"2024-02-28T13:11:13Z","isi":1,"intvolume":"       101","volume":101,"year":"2020","article_type":"original","citation":{"ama":"Ghazaryan A, Lopes PLS, Hosur P, Gilbert MJ, Ghaemi P. Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors. <i>Physical Review B</i>. 2020;101(2). doi:<a href=\"https://doi.org/10.1103/PhysRevB.101.020504\">10.1103/PhysRevB.101.020504</a>","ista":"Ghazaryan A, Lopes PLS, Hosur P, Gilbert MJ, Ghaemi P. 2020. Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors. Physical Review B. 101(2), 020504.","chicago":"Ghazaryan, Areg, P. L.S. Lopes, Pavan Hosur, Matthew J. Gilbert, and Pouyan Ghaemi. “Effect of Zeeman Coupling on the Majorana Vortex Modes in Iron-Based Topological Superconductors.” <i>Physical Review B</i>. American Physical Society, 2020. <a href=\"https://doi.org/10.1103/PhysRevB.101.020504\">https://doi.org/10.1103/PhysRevB.101.020504</a>.","apa":"Ghazaryan, A., Lopes, P. L. S., Hosur, P., Gilbert, M. J., &#38; Ghaemi, P. (2020). Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevB.101.020504\">https://doi.org/10.1103/PhysRevB.101.020504</a>","short":"A. Ghazaryan, P.L.S. Lopes, P. Hosur, M.J. Gilbert, P. Ghaemi, Physical Review B 101 (2020).","mla":"Ghazaryan, Areg, et al. “Effect of Zeeman Coupling on the Majorana Vortex Modes in Iron-Based Topological Superconductors.” <i>Physical Review B</i>, vol. 101, no. 2, 020504, American Physical Society, 2020, doi:<a href=\"https://doi.org/10.1103/PhysRevB.101.020504\">10.1103/PhysRevB.101.020504</a>.","ieee":"A. Ghazaryan, P. L. S. Lopes, P. Hosur, M. J. Gilbert, and P. Ghaemi, “Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors,” <i>Physical Review B</i>, vol. 101, no. 2. American Physical Society, 2020."},"_id":"7428","article_number":"020504","language":[{"iso":"eng"}],"author":[{"orcid":"0000-0001-9666-3543","full_name":"Ghazaryan, Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","last_name":"Ghazaryan","first_name":"Areg"},{"full_name":"Lopes, P. L.S.","last_name":"Lopes","first_name":"P. L.S."},{"full_name":"Hosur, Pavan","first_name":"Pavan","last_name":"Hosur"},{"full_name":"Gilbert, Matthew J.","first_name":"Matthew J.","last_name":"Gilbert"},{"full_name":"Ghaemi, Pouyan","first_name":"Pouyan","last_name":"Ghaemi"}],"publication":"Physical Review B","doi":"10.1103/PhysRevB.101.020504","external_id":{"isi":["000506843500001"],"arxiv":["1907.02077"]},"publication_identifier":{"issn":["24699950"],"eissn":["24699969"]}}