Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-01-16
Solid State Communications 130, 13 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To appear in Solid State Communications
Scientific paper
10.1016/j.ssc.2004.01.018
Recent experiments on two-dimensional (2D) electron systems have found a sharp increase in the effective mass of electrons with decreasing electron density. In an effort to understand this behavior we employ the many-body theory to calculate the quasiparticle effective mass in 2D electron systems. Because the low density regime is explored in the experiments we use the $GW\Gamma$ approximation where the vertex correction $\Gamma$ describes the correlation effects to calculate the self-energy from which the effective mass is obtained. We find that the quasiparticle effective mass shows a sharp increase with decreasing electron density. Disorder effects due to charged impurity scattering plays a crucial role in density dependence of effective mass.
Asgari Reza
Davoudi Bahman
Tanatar B.
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