@article{21373,
  abstract     = {Cold atom experiments show that a mobile impurity particle immersed in a weakly interacting Bose-Einstein condensate forms a well-defined quasiparticle (Bose polaron) for weak to moderate impurity-boson interaction strengths, whereas a significant line broadening is consistently observed for strong interactions. Motivated by this, we introduce a phenomenological theory based on the assumption that the most relevant states are characterized by the impurity correlated with at most one boson, since they have the largest overlap with the uncorrelated states to which the most common experimental probes couple. These experimentally relevant states can, however, decay to lower energy states characterized by correlations involving multiple bosons, and we model this using a minimal variational wave function combined with a complex impurity-boson interaction strength. We first motivate this approach by comparing to a more elaborate theory that includes correlations with up to two bosons. Our phenomenological model is shown to recover the main results of two recent experiments probing both the spectral and the nonequilibrium properties of the Bose polaron. Our work offers an intuitive framework for analyzing experimental data and highlights the importance of understanding the complicated problem of the Bose polaron decay in a many-body setting.},
  author       = {Al Hyder, Ragheed and Bruun, G. M. and Pohl, T. and Lemeshko, Mikhail and Volosniev, Artem},
  issn         = {2643-1564},
  journal      = {Physical Review Research},
  publisher    = {American Physical Society},
  title        = {{Phenomenological model of decaying Bose polarons}},
  doi          = {10.1103/16dk-5dgx},
  volume       = {8},
  year         = {2026},
}

@article{19880,
  abstract     = {We investigate quantum transport in a two-dimensional electron system coupled to a chiral molecular potential, demonstrating how molecular chirality and orientation affect charge and spin transport properties. We propose a minimal model for realizing true chiral symmetry breaking on a magnetized surface, with a crucial role played by the tilt angle of the molecular dipole with respect to the surface. For non-zero tilting, we show that the Hall response exhibits clear signatures of chirality-induced effects, in both charge- and spin-resolved observables. Concerning the former, tilted enantiomers produce asymmetric Hall conductances and, even more remarkably, the persistence of this feature in the absence of spin–orbit coupling (SOC) signals how the enantiospecific charge response results from electron scattering off the molecular potential. Concerning spin-resolved observables where SOC plays a relevant role, we reveal that chiral symmetry breaking is crucial in enabling spin-flipping processes.},
  author       = {Al Hyder, Ragheed and Lemeshko, Mikhail and Cappellaro, Alberto},
  issn         = {1089-7690},
  journal      = {The Journal of Chemical Physics},
  number       = {23},
  publisher    = {AIP Publishing},
  title        = {{Quantum transport in the presence of a chiral molecular potential}},
  doi          = {10.1063/5.0271155},
  volume       = {162},
  year         = {2025},
}

@article{19437,
  abstract     = {We demonstrate the formation of ferroelectric domain-wall polarons in a minimal two-dimensional lattice model of electrons interacting with rotating dipoles. Along the domain wall, the rotors polarize in opposite directions, causing the electron to localize along a particular lattice direction. The rotor-electron coupling is identified as the origin of a structural instability in the crystal that leads to the domain-wall formation via a symmetry-breaking process. Our results provide the first theoretical description of ferroelectric polarons, as discussed in the context of soft semiconductors.},
  author       = {Kluibenschedl, Florian and Koutentakis, Georgios and Al Hyder, Ragheed and Lemeshko, Mikhail},
  issn         = {1079-7114},
  journal      = {Physical Review Letters},
  number       = {9},
  publisher    = {American Physical Society},
  title        = {{Domain-wall ferroelectric polarons in a two-dimensional rotor lattice model}},
  doi          = {10.1103/PhysRevLett.134.096302},
  volume       = {134},
  year         = {2025},
}