Search for multiple-step integer quantum Hall transitions

Article

关键词: METAL-INSULATOR-TRANSITION;    GLOBAL PHASE-DIAGRAM;    MAGNETIC-FIELD;    DISORDERED SYSTEMS;    LANDAU-LEVEL;    LOCALIZATION;    UNIVERSALITY;    STATES;    LIQUID;   

DOI  :  10.1103/PhysRevB.64.201313

来源: SCIE

【 摘 要 】

Recent experiments in the integer quantum Hall regime seem to find direct transitions from quantum Hall states with Hall conductance sigma (xy)=ne(2)/h with integer n> 1, to an insulating state in weak magnetic fields. We study the issue of quantum Hall transitions with change in Hall conductance ne(2)/h with n> 1 using a variation of the tight-binding lattice model for noninteracting electrons. Although such transitions do exist in our model for special tuning of parameters, they generically split, with the Hall conductance changing by e(2)/h at each transition. This suggests that a generic multiple step quantum Hall transition is incompatible with a noninteracting electron picture.

【 授权许可】

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