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Paper   IPM / P / 7230
School of Physics
  Title:   Effective Mass Enhancement in Two-Dimensional Electron Systems: The Rrole of Interaction and Disorder Effects
1.  R. Asgari
2.  B. Davoudi
3.  B. Tanatar
  Status:   Published
  Journal: Solid State Commun.
  Vol.:  130
  Year:  2004
  Pages:   13-17
  Supported by:  IPM
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 GWΓ approximation where the vertex correction describes the correlation Γ 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.

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