Plasmon attenuation and optical conductivity of a twodimensional electron gas
Abstract
In a ballistic twodimensional 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, wave vector, 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 electronhole pairs, phononassisted excitation of one pair, and a direct plasmonphonon conversion. We evaluate the corresponding contributions to the plasmon linewidth and to the optical conductivity.
 Publication:

Physical Review B
 Pub Date:
 May 2004
 DOI:
 10.1103/PhysRevB.69.195302
 arXiv:
 arXiv:condmat/0312684
 Bibcode:
 2004PhRvB..69s5302M
 Keywords:

 73.23.b;
 72.30.+q;
 71.45.Gm;
 63.22.+m;
 Electronic transport in mesoscopic systems;
 Highfrequency effects;
 plasma effects;
 Exchange correlation dielectric and magnetic response functions plasmons;
 Phonons or vibrational states in lowdimensional structures and nanoscale materials;
 Condensed Matter  Mesoscopic Systems and Quantum Hall Effect
 EPrint:
 8 pages, 4 figures