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Terahertz absorption in a periodically modulated two-dimensional electron gas under a magnetic field

Conference Paper


Abstract


  • We present a theoretical calculation of the THz electromagnetic (EM) absorption in a periodically modulated two-dimensional system. It is found that: (i) The electron-hole pair excitation of finite momentum is the dominant absorption mechanism below and around the cyclotron frequency. Such processes are absent in a uniform electron gas under a magnetic field, (ii) The contribution from the plasmon excitation to the EM absorption is no longer singular due to the angular distribution of the spectral weight. The effect of electron-electron interaction can be included to any order while the electron-impurity interaction is included to the lowest order.

Publication Date


  • 1998

Citation


  • Zhang, C., Xu, W., Brataas, A., & Chao, K. A. (1998). Terahertz absorption in a periodically modulated two-dimensional electron gas under a magnetic field. In Physics of Low-Dimensional Structures Vol. 1998 (pp. 39-46).

Scopus Eid


  • 2-s2.0-3042871820

Start Page


  • 39

End Page


  • 46

Volume


  • 1998

Issue


  • 1-2

Abstract


  • We present a theoretical calculation of the THz electromagnetic (EM) absorption in a periodically modulated two-dimensional system. It is found that: (i) The electron-hole pair excitation of finite momentum is the dominant absorption mechanism below and around the cyclotron frequency. Such processes are absent in a uniform electron gas under a magnetic field, (ii) The contribution from the plasmon excitation to the EM absorption is no longer singular due to the angular distribution of the spectral weight. The effect of electron-electron interaction can be included to any order while the electron-impurity interaction is included to the lowest order.

Publication Date


  • 1998

Citation


  • Zhang, C., Xu, W., Brataas, A., & Chao, K. A. (1998). Terahertz absorption in a periodically modulated two-dimensional electron gas under a magnetic field. In Physics of Low-Dimensional Structures Vol. 1998 (pp. 39-46).

Scopus Eid


  • 2-s2.0-3042871820

Start Page


  • 39

End Page


  • 46

Volume


  • 1998

Issue


  • 1-2