电场诱导α-（BEDT-TTF）_2I_3类Dirac Landau能级谷简并度的提升
Electric-field-induced lifting of the valley degeneracy in alpha-(BEDT-TTF)_2I_3 Dirac-like Landau levels
摘要：
层状有机材料α-（BEDT-TTF）_2I_3 [BEDT-TTF=双（亚乙基二硫代）四硫富瓦烯]中的相对论朗道能级对狄拉克锥的倾斜很敏感，与石墨烯一样，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。该方案可以在红外透射光谱中进行测试。
英文摘要：
The relativistic Landau levels in the layered organic material alpha-(BEDT-TTF)_2I_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 inplane 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. The scenario may be tested in infrared transmission spectroscopy.
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