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Plasmon attenuation and optical conductivity of a two-dimensional electron gas

E. G. Mishchenko·M. Yu. Reizer·L. I. Glazman
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Abstract

In a ballistic two-dimensional electron gas, the Landau damping does not lead to plasmon attenuation in a broad interval of wave vectors q << k_F. Similarly, it does not contribute to the optical conductivity σ(ω, q) in a wide domain of its arguments, E_F > ω> qv_F, where E_F, k_F and v_F are, respectively, the Fermi energy, wavevector and velocity of the electrons. We identify processes that result in the plasmon attenuation in the absence of Landau damping. These processes are: the excitation of two electron-hole pairs, phonon-assisted excitation of one pair, and a direct plasmon-phonon conversion. We evaluate the corresponding contributions to the plasmon linewidth and to the optical conductivity.

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E. G. Mishchenko, M. Yu. Reizer, L. I. Glazman. 2004-04-23. Plasmon attenuation and optical conductivity of a two-dimensional electron gas. https://doi.org/10.1103/physrevb.69.195302

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