Dynamics of lattice pinned charge stripes
软凝聚态物质
2009-10-31 v1
摘要
We study the transversal dynamics of a charged stripe (quantum string) and show that zero temperature quantum fluctuations are able to depin it from the lattice. If the hopping amplitude t is much smaller than the string tension J, the string is pinned by the underlying lattice. At t>>J, the string is depinned and allowed to move freely, if we neglect the effect of impurities. By mapping the system onto a 1D array of Josephson junctions, we show that the quantum depinning occurs at t/J = 2 / pi^2. Besides, we exploit the relation of the stripe Hamiltonian to the sine-Gordon theory and calculate the infrared excitation spectrum of the quantum string for arbitrary t/J values.
引用
@article{arxiv.cond-mat/9912075,
title = {Dynamics of lattice pinned charge stripes},
author = {Y. A. Dimashko and C. Morais Smith and N. Hasselmann and A. O. Caldeira},
journal= {arXiv preprint arXiv:cond-mat/9912075},
year = {2009}
}
备注
4 pages, 2 figures