Topological characterization of delocalization in a spin-orbit coupling system

Article

关键词: RANDOM MAGNETIC-FIELD;    QUANTIZED HALL CONDUCTANCE;    DENOMINATOR FILLING FRACTIONS;    2 DIMENSIONS;    LOCALIZATION PROBLEM;    STATES;    PHASE;    FLUX;    TRANSITION;    SCATTERING;   

DOI  :  10.1103/PhysRevB.54.R11070

来源: SCIE

【 摘 要 】

We show that wave functions 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.

【 授权许可】

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