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Laser energy dependence of valley polarization in transition-metal dichalcogenides

机译:过渡金属二卤化物中谷极化的激光能量依赖性

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摘要

Photoabsorption spectra by circular polarized light in transition-metal dichalcogenides are calculated as a function of laser excitation energy. Although the 100% valley polarization occurs at the K point of the Brillouin zone, the difference of the absorption intensity for left-handed and right-handed circular polarized light becomes maximum at about 1 eV higher energy than the direct energy band gap. The maximum intensity difference corresponds to the so-called A valley in the Brillouin zone. In order to understand valley polarization, analytic formula of optical absorption is given by tight-binding method.
机译:计算过渡金属二卤化物中圆偏振光的光吸收光谱,作为激光激发能的函数。尽管100%的谷底偏振发生在布里渊区的K点,但左旋和右旋圆偏振光的吸收强度之差在比直接能带隙高约1 eV的能量处变为最大。最大强度差对应于布里渊区中的所谓A谷。为了理解波谷偏光,采用紧束缚法给出了光吸收的解析公式。

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  • 来源
    《Physical review》 |2016年第23期|235408.1-235408.10|共10页
  • 作者单位

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

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