Tian, Chushun (2012). Anomalous quantum diffusion and the topological metal. Phys. Rev. B, 86 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1098-0121

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Abstract

Electron wave scattering off disorders provides a key to many fascinating transport phenomena recently observed in topological insulators. Here, we present a nonperturbative diagrammatic theory of this subject. Surprisingly, quantum superdiffusion is found on the surface of three-dimensional strong topological insulators regardless of disorder strength (but not vanishing), where the diffusion coefficient grows in time logarithmically. Such a transport anomaly serves as a main characteristic of the novel quantum metal, the so-called topological metal, and indicates that it is a hybridization of Ohmic and perfect metals. It washes out the Anderson transition occurring in two-dimensional normal metals with disordered spin-orbit coupling, and leads to a logarithmic divergence of the conductance in the sample size instead. Therefore, the present work provides an analytical proof of the transport anomaly discovered numerically [Nomura, Koshino, and Ryu, Phys. Rev. Lett. 99, 146806 (2007); Bardarson et al., ibid. 99, 106801 (2007)].

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Tian, ChushunUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-482841
DOI: 10.1103/PhysRevB.86.121304
Journal or Publication Title: Phys. Rev. B
Volume: 86
Number: 12
Date: 2012
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1098-0121
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SINGLE DIRAC CONE; INSULATORS; SURFACE; LOCALIZATION; REALIZATION; BI2TE3Multiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/48284

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