Hashimoto, Katsushi, Sohrmann, C., Wiebe, Jens, Inaoka, T., Meier, F., Hirayama, Yoshiro, Roemer, Rudolf A., Wiesendanger, R. and Morgenstern, M. (2008) Quantum hall transition in real space : from localized to extended states. Physical Review Letters, Vol.101 (No.25). article no. 256802 . doi:10.1103/PhysRevLett.101.256802

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Abstract

Using scanning tunneling spectroscopy in an ultrahigh vacuum at low temperature (T=0.3 K) and high magnetic fields (B <= 12 T), we directly probe electronic wave functions across an integer quantum Hall transition. In accordance with theoretical predictions, we observe the evolution from localized drift states in the insulating phases to branched extended drift states at the quantum critical point. The observed microscopic behavior close to the extended state indicates points of localized quantum tunneling, which are considered to be decisive for a quantitative description of the transition.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics Faculty of Science > Centre for Scientific Computing
Library of Congress Subject Headings (LCSH):	Quantum Hall effect, Phase transformations (Statistical physics)
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	19 December 2008
Dates:	Date Event 19 December 2008 Published
Volume:	Vol.101
Number:	No.25
Number of Pages:	4
Page Range:	article no. 256802
DOI:	10.1103/PhysRevLett.101.256802
Status:	Peer Reviewed
Publication Status:	Published
Funder:	Deutsche Forschungsgemeinschaft (DFG)
Grant number:	SFB 508-B4 (DFG)

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