Effective mass enhancement in two-dimensional electron systems: the role of interaction and disorder effects

Abstract

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.

To appear in Solid State Communications

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Cited by in corpus (9)

• Metal-insulator transitions and the effects of electron-electron interactions in two-dimensional electron systems
• Quasiparticle self-energy and many-body effective mass enhancement in a two-dimensional electron liquid
• Contrast between spin and valley degrees of freedom
• Effective mass suppression upon complete spin-polarization in an isotropic two-dimensional electron system
• Effect of disorder on the ground-state properties of graphene
• Quasiparticle properties of graphene in the presence of disorder
• Effective mass suppression in a ferromagnetic two-dimensional electron liquid
• Effective Mass and Spin Susceptibility of Dilute Two-Dimensional Holes in GaAs
• Spin polarization dependence of quasiparticle properties in graphene