A topological characterization of delocalization in a spin-orbit coupling system

Details A topological characterization of delocalization in a spin-orbit coupling system A topological characterization of delocalization in a spin-orbit coupling system

1996-09-17

arxiv.org/abs/cond-mat/9609147v1

Physics

Condensed Matter

RevTex, 12 pages; Two PostScript figures

Scientific paper

10.1103/PhysRevB.54.R11070

We show that wavefunctions in a two-dimensional (2D) electron system with spin-orbit coupling can be characterized by a topological quantity--the Chern integer due to the existence of the intrinsic Kramers degeneracy. The localization-delocalization transition in such a system is studied in terms of such a Chern number description, which reproduces the known metal-insulator transition point. The present work suggests a unified picture for various known 2D delocalization phenomena based on the same topological characterization.

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