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Effect of Coulomb interactions on the Seebeck coefficient of the organic Dirac electron system α-(BEDT-TTF)_2I_3

机译:库仑相互作用对有机Dirac电子系统的塞贝克系数α-(卧床-TTF)_2i_3

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摘要

Motivated by the results of recent thermoelectric effect studies, we show the effects of Coulomb interactions on the Seebeck coefficient based on an extended Hubbard model that describes the electronic states of a slightly doped organic Dirac electron system, α-(BEDT-TTF)_2I_3. Our results indicate that the Hartree terms of the Coulomb interactions enhance the electron-hole asymmetry of the energy band structure and change the energy dependence of the relaxation time from impurity scattering, which reflects the shape of the density of states. Thus, the Seebeck coefficient exhibits a nonmonotonic T dependence which qualitatively agrees with the experimental results. Furthermore, we also show that the signs of the Seebeck coefficient and the Hall coefficient calculated by linear response theory do not necessarily correspond to the sign of the chemical potential using a modified Weyl model with electron-hole asymmetry. These results point out that changing the electron-hole asymmetry by strong Coulomb interaction has the potential to control the sign and value of the Seebeck coefficient in the Dirac electron systems.
机译:通过最近的热电效应研究的结果,我们展示了基于扩展的船舶模型的Coulomb相互作用对eDbeck系数的影响,所述延伸的船舶模型描述了略微掺杂有机DIRAC电子系统的电子状态,α-(卧TTF)_2i_3。我们的结果表明,库仑相互作用的Hartree术语增强了能带结构的电子孔不对称性,并从杂质散射改变松弛时间的能量依赖性,这反映了状态密度的形状。因此,塞贝克系数表现出具有定性同意实验结果的非单调T依赖性。此外,我们还表明,塞贝克系数的迹象和通过线性响应理论计算的霍尔系数不一定对应于使用具有电子孔不对称的改进的Weyl模型的化学潜力的符号。这些结果指出,通过强的库仑相互作用改变电子孔不对称性具有控制Dirac电子系统中塞贝克系数的符号和值的可能性。

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  • 来源
    《Physical review》 |2020年第24期|245201.1-245201.10|共10页
  • 作者

    D. Ohki; Y. Omori; A. Kobayashi;

  • 作者单位

    Department of Physics Nagoya University Furo-cho Chikusa-ku Nagoya 464-8602 Japan;

    Toyota College National Institute of Technology Eisei-cho 2-1 Toyota 471-8525 Japan;

    Department of Physics Nagoya University Furo-cho Chikusa-ku Nagoya 464-8602 Japan;

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