Berry Phases with Real Hamiltonians With and Without a Many-body System as a Background
Loading...
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
We present both the gauge theoretic description and the numerical calculations of the Berry phases with the real eigenstates, involving one with a many-body system as a background and the other with no such background. We demonstrate that for the former the sign of the Berry phase factor for a spin $\f{1}{2}$ particle (hole) coupled to a slow subsystem (phonon) depends on both the strength of electron correlations and the characteristics of the closed paths, unlike the cases for the latter.
4 pages RevTex, uses epsf,twocolumn, 3 embedded postscript figures, submitted to PRL, acknowledgement appended
4 pages RevTex, uses epsf,twocolumn, 3 embedded postscript figures, submitted to PRL, acknowledgement appended