Tkachenko polarons in vortex lattices
Quantum Gases
2013-09-18 v2 Strongly Correlated Electrons
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.
Cite
@article{arxiv.1307.0144,
title = {Tkachenko polarons in vortex lattices},
author = {M. A. Caracanhas and V. S. Bagnato and R. G. Pereira},
journal= {arXiv preprint arXiv:1307.0144},
year = {2013}
}
Comments
10 pages, 2 figures