Floating of extended states in a random magnetic field with a finite mean
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概要
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Effects of a uniform magnetic field on two-dimensional (2D) electrons subject to a random magnetic field(RMF) are studied by a multifractal scaling analysis. For sufficiently strong uniform field (B¯ ≫ δb), the RMFsystem is equivalent to a quantum Hall system (QHS), namely, the spectral density of states splits intosubbands, and states only at the subband centers are extended with the localization-length exponent v=2.31±0.01, where B¯ is the averaged magnetic field and d b is the characteristic amplitude of the spatially fluctuatingfield. In the case of B¯＜＝δb , subbands overlap each other and energies of extended states shift upwardswith keeping its universality class. This behavior conflicts with a recent theoretical prediction and demonstratesthat 2D systems in RMF’s even with small finite means are rather close to QHS’s.
- The American Physical Societyの論文
- 2000-12-15
The American Physical Society | 論文
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