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Floating of extended states in a random magnetic field with a finite mean

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タイトル: Floating of extended states in a random magnetic field with a finite mean
著者: Yakubo, K. 著作を一覧する
発行日: 2000年12月15日
出版者: The American Physical Society
巻: 62
号: 24
開始ページ: 16756
終了ページ: 16760
出版社 DOI: 10.1103/PhysRevB.62.16756
抄録: 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 RMF system is equivalent to a quantum Hall system (QHS), namely, the spectral density of states splits into subbands, 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 fluctuating field. In the case of B¯≲δb , subbands overlap each other and energies of extended states shift upwards with keeping its universality class. This behavior conflicts with a recent theoretical prediction and demonstrates that 2D systems in RMF's even with small finite means are rather close to QHS's.
Rights: Copyright © 2003 American Physical Society
Relation (URI):
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 矢久保 考介


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