Anomalous Thermoelectric Transport and Giant Nernst Effect in Multilayered Massless Dirac Fermion System

作者：Konoike Takako^*; Sato Mitsuyuki; Uchida Kazuhito; Osada Toshihito

来源：Journal of the Physical Society of Japan, 2013, 82(7): 073601.

DOI：10.7566/JPSJ.82.073601

• Dirac fermion
• organic conductor
• alpha-(BEDT-TTF)(2)I-3
• thermopower
• Seebeck effect
• Nernst effect
• high pressure
• zero-mode Landau level
• quantum limit
• spin splitting

We have measured the thermopower and Nernst effect of the multilayered massless Dirac fermion system alpha-(BED-TTTF)(2)I-3 under pressure. In the quantum limit region, the extremely large Nernst effect rather than the Seebeck effect was observed. This unusual behavior results from the intrinsic nature of the zero-mode Landau level characteristic of the Dirac fermion system. The possible origin of the giant Nernst signal compared with that of graphene is the sharp width of the Landau level and the Zeeman gap in high-purity alpha-(BEDT-TTF)(2)I-3 crystal.

• 出版日期2013-7