Tkachenko polarons in vortex lattices

Abstract

We analyze the properties of impurities immersed in a vortex lattice formed by ultracold bosons in the mean field quantum Hall regime. In addition to the effects of a periodic lattice potential, the impurity is dressed by collective modes with parabolic dispersion (Tkachenko modes). We derive the effective polaron model, which contains a marginal impurity-phonon interaction. The polaron spectral function exhibits a Lorentzian broadening for arbitrarily small wave vectors even at zero temperature, in contrast with the result for optical or acoustic phonons. The anomalous damping of Tkachenko polarons could be detected experimentally using momentum-resolved spectroscopy.

10 pages, 2 figures

References in corpus (7)

• Many-Body Physics with Ultracold Gases
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Attractive and repulsive Fermi polarons in two dimensions
• Cold Atoms and Molecules in Self-Assembled Dipolar Lattices
• Investigating polaron transitions with polar molecules
• Dissipative dynamics of atomic Hubbard models coupled to a phonon bath: Dark state cooling of atoms within a Bloch band of an optical lattice
• Perturbation theory of the mass enhancement for a polaron coupled to acoustic phonons

Cited by in corpus (7)

• Hubbard model for atomic impurities bound by the vortex lattice of a rotating BEC
• Phase transition of ultracold atoms immersed in a BEC vortex lattice
• Density-dependent hopping for ultracold atoms immersed in a Bose-Einstein-condensate vortex lattice
• Mobile Impurities and Orthogonality Catastrophe in two-dimensional Vortex Lattices
• Bound-state spectrum of an impurity in a quantum vortex
• Tunable breakdown of the polaron picture for mobile impurities in a topological semimetal
• Bound states in two-dimensional Fermi systems with quadratic band touching