@article{11590,
  abstract     = {We investigate the ground-state properties of weakly repulsive one-dimensional bosons in the presence of an attractive zero-range impurity potential. First, we derive mean-field solutions to the problem on a finite ring for the two asymptotic cases: (i) all bosons are bound to the impurity and (ii) all bosons are in a scattering state. Moreover, we derive the critical line that separates these regimes in the parameter space. In the thermodynamic limit, this critical line determines the maximum number of bosons that can be bound by the impurity potential, forming an artificial atom. Second, we validate the mean-field results using the flow equation approach and the multi-layer multi-configuration time-dependent Hartree method for atomic mixtures. While beyond-mean-field effects destroy long-range order in the Bose gas, the critical boson number is unaffected. Our findings are important for understanding such artificial atoms in low-density Bose gases with static and mobile impurities.},
  author       = {Brauneis, Fabian and Backert, Timothy G. and Mistakidis, Simeon I. and Lemeshko, Mikhail and Hammer, Hans Werner and Volosniev, Artem},
  issn         = {1367-2630},
  journal      = {New Journal of Physics},
  number       = {6},
  publisher    = {IOP Publishing},
  title        = {{Artificial atoms from cold bosons in one dimension}},
  doi          = {10.1088/1367-2630/ac78d8},
  volume       = {24},
  year         = {2022},
}

@article{11998,
  abstract     = {Recently it became possible to study highly excited rotational states of molecules in superfluid helium through nonadiabatic alignment experiments (Cherepanov et al 2021 Phys. Rev. A 104 L061303). This calls for theoretical approaches that go beyond explaining renormalized values of molecular spectroscopic constants, which suffices when only the lowest few rotational states are involved. As the first step in this direction, here we present a basic quantum mechanical model describing highly excited rotational states of molecules in superfluid helium nanodroplets. We show that a linear molecule immersed in a superfluid can be seen as an effective symmetric top, similar to the rotational structure of radicals, such as OH or NO, but with the angular momentum of the superfluid playing the role of the electronic angular momentum in free molecules. The simple theory sheds light onto what happens when the rotational angular momentum of the molecule increases beyond the lowest excited states accessible by infrared spectroscopy. In addition, the model allows to estimate the effective rotational and centrifugal distortion constants for a broad range of species and to explain the crossover between light and heavy molecules in superfluid 4He in terms of the many-body wavefunction structure. Some of the above mentioned insights can be acquired by analyzing a simple 2 × 2 matrix.},
  author       = {Cherepanov, Igor and Bighin, Giacomo and Schouder, Constant A. and Chatterley, Adam S. and Stapelfeldt, Henrik and Lemeshko, Mikhail},
  issn         = {1367-2630},
  journal      = {New Journal of Physics},
  number       = {7},
  publisher    = {IOP},
  title        = {{A simple model for high rotational excitations of molecules in a superfluid}},
  doi          = {10.1088/1367-2630/ac8113},
  volume       = {24},
  year         = {2022},
}

@article{10628,
  abstract     = {The surface states of 3D topological insulators in general have negligible quantum oscillations (QOs) when the chemical potential is tuned to the Dirac points. In contrast, we find that topological Kondo insulators (TKIs) can support surface states with an arbitrarily large Fermi surface (FS) when the chemical potential is pinned to the Dirac point. We illustrate that these FSs give rise to finite-frequency QOs, which can become comparable to the extremal area of the unhybridized bulk bands. We show that this occurs when the crystal symmetry is lowered from cubic to tetragonal in a minimal two-orbital model. We label such surface modes as 'shadow surface states'. Moreover, we show that the sufficient next-nearest neighbor out-of-plane hybridization leading to shadow surface states can be self-consistently stabilized for tetragonal TKIs. Consequently, shadow surface states provide an important example of high-frequency QOs beyond the context of cubic TKIs.},
  author       = {Ghazaryan, Areg and Nica, Emilian M. and Erten, Onur and Ghaemi, Pouyan},
  issn         = {1367-2630},
  journal      = {New Journal of Physics},
  number       = {12},
  publisher    = {IOP Publishing},
  title        = {{Shadow surface states in topological Kondo insulators}},
  doi          = {10.1088/1367-2630/ac4124},
  volume       = {23},
  year         = {2021},
}

@article{9164,
  author       = {Speck, Thomas and Tailleur, Julien and Palacci, Jérémie A},
  issn         = {1367-2630},
  journal      = {New Journal of Physics},
  keywords     = {General Physics and Astronomy},
  number       = {6},
  publisher    = {IOP Publishing},
  title        = {{Focus on active colloids and nanoparticles}},
  doi          = {10.1088/1367-2630/ab90d9},
  volume       = {22},
  year         = {2020},
}