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期刊论文
Search for multiple-step integer quantum Hall transitions
PHYSICAL REVIEW B, VOLUME 64, 201313(R),-0001,():
Recent experiments in the integer quantum Hall regime seem to find direct transitions from quantum Hall states with Hall conductance σ=ne2/h with integer n>1, to an insulating state in weak magnetic fields. We study the issue of quantmn Hall transitions with change in Hall conductance ne2/h with n>1 using a variation of the tight-binclJng lattice model for noninteracting electrons. Although such transitions do exit in our model for special tuning of parameters, they generically split, with the Hall conductance changing by e2/h at each transition. This suggests that a generic multiple step quantum Hall transition is incompatible with a noninter-acting electron picture.
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