Anomalous Thermoelectric Transport and Giant Nernst Effect in Multilayered Massless Dirac Fermion System
Anomalous Thermoelectric Transport and Giant Nernst Effect in Multilayered Massless Dirac Fermion System
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DOI：
10.7566/jpsj.82.073601
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发表时间：
2013-06
影响因子：
1.7
通讯作者：
T. Konoike;M. Sato;K. Uchida;T. Osada
中科院分区：
文献类型：
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作者：
T. Konoike;M. Sato;K. Uchida;T. Osada
我们测量了多层无质量狄拉克费米子系统α-（BEDT-TTF）_2I_3在压力下的热电势和能斯特效应。在量子极限区，观察到极大的能斯特效应而不是塞贝克效应。这种不寻常的行为是狄拉克费米子系统的零模朗道能级特性的内在本质所致。高纯度α-（BEDT-TTF）2 I3晶体中的朗道能级宽度和塞曼能隙是产生相对于石墨烯的巨大能斯特信号的可能原因。
We have measured the thermopower and Nernst effect of the multilayered massless Dirac fermion system α-(BEDT-TTF)2I3 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 α-(BEDT-TTF)2I3 crystal.