Document Detail


Universal thermoelectric effect of Dirac fermions in graphene.
MedLine Citation:
PMID:  20366904     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
We numerically study the thermoelectric transports of Dirac fermions in graphene in the presence of a strong magnetic field and disorder. We find that the thermoelectric transport coefficients demonstrate universal behavior depending on the ratio between the temperature and the width of the disorder-broadened Landau levels (LLs). The transverse thermoelectric conductivity alpha{xy} reaches a universal quantum value at the center of each LL in the high temperature regime, and it has a linear temperature dependence at low temperatures. The calculated Nernst signal has a peak at the central LL with heights of the order of k{B}/e, and changes sign near other LLs, while the thermopower has an opposite behavior, in good agreement with experimental data. The validity of the generalized Mott relation between the thermoelectric and electrical transport coefficients is verified in a wide range of temperatures.
Authors:
Lijun Zhu; Rong Ma; Li Sheng; Mei Liu; Dong-Ning Sheng
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Publication Detail:
Type:  Journal Article     Date:  2010-02-19
Journal Detail:
Title:  Physical review letters     Volume:  104     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-04-06     Completed Date:  2010-06-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  076804     Citation Subset:  -    
Affiliation:
Department of Physics and Astronomy, California State University, Northridge, California 91330, USA.
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