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M. Matsuo, A. Endo, N. Hatano, H. Nakamura, R. Shirasaki, K. Sugihara
Quantum Nernst Effect in a Bismuth Single Crystal
Date of publication:
July 09, 2009
Bismuth, quantum Hall effect, quantum Nernst effect, phonon-drag effect
We calculate the phonon-drag contribution to the transverse (Nernst) thermoelectric power Syx in a bismuth single crystal subjected to a quantizing magnetic field. The calculated heights of the Nernst peaks originating from the hole Landau levels and their temperature dependence reproduce the right order of magnitude for those of the pronounced magneto-oscillations recently reported by Behnia et al [Phys. Rev. Lett. 98, 166602 (2007)]. A striking experimental finding that Syx is much larger than the longitudinal (Seebeck) thermoelectric power Sxx can be naturally explained as the effect of the phonon drag, combined with the well-known relation between the longitudinal and the Hall resistivity ρxx >> |ρyx| in a semi-metal bismuth. The calculation that includes the contribution of both holes and electrons suggests that some of the hitherto unexplained minor peaks located roughly at the fractional filling of the hole Landau levels are attributable to the electron Landau levels.
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