Magnetotransport of Massless Dirac Fermions in Multilayer Organic Conductors
Magnetotransport of Massless Dirac Fermions in Multilayer Organic Conductors
复制标题
多层有机导体中无质量狄拉克费米子的磁输运
DOI：
10.1088/1742-6596/334/1/012049
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
and T. Konoike
中科院分区：
文献类型：
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作者：
T. Osada;K. Uchida;and T. Konoike
研究了多层无质量狄拉克费米子系统的磁输运问题，其中二维层中存在一对弱层间耦合的狄拉克-锥色散层。费米能级被假定为固定在狄拉克点，导致零间隙导体。在高场量子极限下，只有狄拉克点处的n= 0朗道能级被部分占据，电导率张量的所有元素都由层间耦合的最低阶贡献来计算.我们推导出了面内电阻饱和、面内霍尔电阻局部极大值、负层间磁电阻以及层间霍尔电阻的cotθ型异常角度依赖性。这些结果很好地解释了在有机零能隙导体α-（BEDT-TTF）2 I3及其相关化合物中观察到的神秘输运特性。
Magnetotransport has been considered in multilayer massless Dirac fermion systems, in which two-dimensional (2D) layers with a pair of Dirac-cone dispersion stack with weak interlayer coupling. The Fermi level is assumed to be fixed at the Dirac point resulting in the zero-gap conductor. At the high-field quantum limit, where only the n= 0 Landau level at the Dirac point is partially occupied, all elements of conductivity tensor have been evaluated by the lowest order contribution of interlayer coupling. We have deduced saturation of in-plane resistance, local maxima of in-plane Hall resistance, negative interlayer magnetoresistance, and cotθ-type unusual angle-dependence of interlayer Hall resistance. These results propose good explanations for mysterious transport features observed in organic zero-gap conductors, α-(BEDT-TTF) 2 I 3 and its related compounds.