Thermoelectric and thermal transport properties in ABA-stacked trilayer graphene
School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, P.R. China
Received: 20 May 2012
Received in final form: 7 June 2012
Published online: 30 July 2012
We numerically study the thermoelectric and thermal transport in ABA-stacked trilayer graphene in the presence of a strong magnetic field and disorder. We find that the thermoelectric conductivities display different asymptotic behaviors, depending on the ratio between the temperature and the width of the disorder-broadened Landau levels (LLs), similar to those of monolayer graphene. In the high temperature regime, the transverse thermoelectric conductivity αxy saturates to a universal value 8.31kBe / h at the center of each LL, and displays a linear temperature dependence at low temperatures. The calculated Nernst signal has a peak with a height of the order of kB / e, while the thermopower changes sign at the central LL. We attribute this unique behavior at the central is due to the coexistence of particle and hole LLs. We further study the thermal transport from electronic origin and verify the validity of the generalized Weidemann-Franz law.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012