UNSPECIFIED (2003) Renormalization group approach to the energy level statistics at the integer quantum Hall transition. In: 23rd International Conference on Low Temperature Physics (LT23), HIROSHIMA, JAPAN, AUG 20-27, 2002. Published in: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 18 (1-3). pp. 126-127.

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Abstract

We apply the real-space renormalization group (RG) approach to investigate the energy level statistics at the integer quantum Hall (QH) transition. Within the RG approach the macroscopic array of saddle points of the Chalker-Coddington network is replaced by a fragment consisting of only five saddle points. Previously, we have demonstrated that the RG approach reproduces the distribution of the conductance at the transition, P(G), with very high accuracy. To assess the level statistics we analyze the phases of the transmission coefficients of the saddle points. We find that, at the transition, the nearest-neighbor energy level spacing distribution (LSD) exhibits well-pronounced level repulsion. We emphasize that a metal-like LSD emerges when the fixed point distribution P-c of G is used. Studying the change of the LSD around the QH transition we observe scaling behavior. Using a one-parameter finite-size scaling analysis we are able to extract a critical exponent v = 2.38 +/- 0.04 of the localization length. (C) 2003 Elsevier Science B.V. All rights reserved.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology Q Science > QC Physics
Journal or Publication Title:	PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Publisher:	ELSEVIER SCIENCE BV
ISSN:	1386-9477
Date:	May 2003
Volume:	18
Number:	1-3
Number of Pages:	2
Page Range:	pp. 126-127
Identification Number:	10.1016/S1386-9477(02)01044-5
Publication Status:	Published
Title of Event:	23rd International Conference on Low Temperature Physics (LT23)
Location of Event:	HIROSHIMA, JAPAN
Date(s) of Event:	AUG 20-27, 2002
URI:	http://wrap.warwick.ac.uk/id/eprint/9630

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