2009/08/31 by Lijun Zhu, R. Ma, L. Sheng +5 · 2 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Dirac fermion #Electrical resistivity and conductivity #Fermion #Graphene #Graphene research and applications #Materials science #Nernst effect #Nernst equation #Physics #Quantum and electron transport phenomena #Quantum mechanics #Seebeck coefficient #Thermoelectric effect #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.104.076804
published as Phys. Rev. Lett. 104, 076804 (2010) · 4 pages, 4 figures, published version
arxiv created 2010/02/19 · openalex publication_date 2010/02/19 · arxiv updated 2010/02/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 alphaxy 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 kB/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.