2004/01/16 by Reza Asgari, R. Asgari, B. Davoudi +1 · 18 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic physics #Condensed matter physics #Effective mass (spring–mass system) #Electron #Electron density #Electron scattering #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Quasiparticle #Scattering #Vertex (graph theory) #cond-mat.mes-hall
paper · pdf · doi:10.1016/j.ssc.2004.01.018
published in Solid State Communications 130(1-2), 13-17 (Elsevier BV) · To appear in Solid State Communications
arxiv created 2004/01/16 · openalex publication_date 2004/01/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Γ 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.