Electric-field-induced lifting of the valley degeneracy in α-(BEDT-TTF)2I3 Dirac-like Landau levels
Electric-field-induced lifting of the valley degeneracy in α-(BEDT-TTF)2I3 Dirac-like Landau levels
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DOI：
10.1209/0295-5075/85/57005
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发表时间：
2009-03-01
期刊：
影响因子：
1.8
通讯作者：
Piechon, F.
中科院分区：
文献类型：
--
作者：
Goerbig, M. O.;Fuchs, J. -N.;Piechon, F.
层状有机材料α-（BEDT-TTF）（2）I-3（BEDT-TTF=双（亚乙基二硫代）四硫富瓦烯）中的相对论性朗道能级对狄拉克锥的倾斜敏感，与石墨烯的情况一样，狄拉克锥的倾斜决定了适当压力下的低能电子性质。我们表明，所施加的面内电场，这恰好是在竞争与锥的倾斜，升降机的双重谷简并由于不同的水平间距。这种情况可以在红外透射光谱中进行测试。版权所有（C）EPLA，2009
The relativistic Landau levels in the layered organic material alpha-(BEDT-TTF)(2)I-3 (BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene) are sensitive to the tilt of the Dirac cones, which, as in the case of graphene, determine the low-energy electronic properties under appropriate pressure. We show that an applied in-plane electric field, which happens to be in competition with the tilt of the cones, lifts the twofold valley degeneracy due to a different level spacing. This scenario may be tested in infrared transmission spectroscopy. Copyright (C) EPLA, 2009