<研究ノート>2層系v=1量子ホール効果における擬スピン・ソリトン

Abstract

We investigate a soliton lattice- a domain structure of pseudospins, in the bilayer quantum Hall state at total Landau level filling factor v= l, with an in-plane magnetic field, where the vertical and in-plane components of the pseudospin represent the layer degree of freedom and phase difference between two layers, respectively. An anomalous peak in the magnetoresistance Rxxappears at the commensurate - incommensurate transition point. The Rxx at the peak behaves highly anisotropic for the angle between the in-plain magnetic field B// and the current, and indicates a formation of the soliton lattice aligned parallel to B// Temperature dependence of the Rxx peak reveals that the dissipation is caused by thermal fluctuations of pseudospin solitons. We construct a phase diagram of the bilayer v=l system as a function of B// and the total electron density.