On the magneto-roton gap and the Laughlin state stability
Mesoscale and Nanoscale Physics
2007-05-23 v1 Strongly Correlated Electrons
Abstract
It is argued that the Girvin, MacDonald and Platzman (GMP) evaluation of the magneto-roton spectrum, in spite of probably being a sensible estimate of the excitation spectrum around the real ground state, is not implying the variational stability of the Laughlin state. The suplementary corrections needed to produce a variational calculation around the Laughlin state at 1/3 value of the filling factor are evaluated approximately. The results indicate, within the considered approximation, the existence of lower lying states for a range of wavevector values.
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Cite
@article{arxiv.cond-mat/9807074,
title = {On the magneto-roton gap and the Laughlin state stability},
author = {Alejandro Cabo Montes de Oca},
journal= {arXiv preprint arXiv:cond-mat/9807074},
year = {2007}
}
Comments
8 pages, 1 figure