Finite-temperature transitions in nu=2 bilayer quantum Hall systems

Article

关键词: 2-DIMENSIONAL ELECTRON-GAS;    PHASE-TRANSITIONS;    DOUBLE-LAYERS;    WELL SYSTEM;    STATES;   

DOI  :  10.1103/PhysRevB.61.R2429

来源: SCIE

【 摘 要 】

In this paper, the influence of an in-plane magnetic field B-parallel to on the transitions at finite temperatures in v = 2 bilayer quantum Hall systems is examined. It is found that there can exist two types of characteristic temperatures which separate different regions in the phase diagram. The first is the Kosterlitz-Thouless (KT) transition temperature, which can have an unusual nonmonotonic dependence on B-parallel to; the second type originates from the crossing of energy levels and always increases with B-parallel to. Based on these results, we point out that the threshold temperature observed in the inelastic light scattering experiments cannot be the KT transition temperature, because the latter shows a totally different B-parallel to dependence as compared with the experimental observation. Instead, it should be the level-crossing temperature, which we found agrees with the B-parallel to dependence observed. Thus an investigation of the KT transition in the bilayer quantum Hall systems awaits experimental measurements to probe the proposed canted antiferromagnetic phase more directly.

【 授权许可】

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