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Paper IPM / P / 7230  


Abstract:  
Recent experiments on twodimensional (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 manybody 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 selfenergy 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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