Tkachenko polarons in vortex lattices
arXiv:1307.0144 · doi:10.1103/PhysRevLett.111.115304
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.
arXiv comment10 pages, 2 figures
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- 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