Many-body effective mass enhancement in a two-dimensional electron liquid

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dc.creatorAsgari, R.
dc.creatorDavoudi, B.
dc.creatorPolini, M.
dc.creatorTosi, M. P.
dc.creatorGiuliani, G. F.
dc.creatorVignale, G.
dc.date2004-12-23
dc.date.accessioned2026-07-07T03:02:55Z
dc.date.available2026-07-07T03:02:55Z
dc.descriptionMotivated by a large number of recent magnetotransport studies we have revisited the problem of the microscopic calculation of the quasiparticle effective mass in a paramagnetic two-dimensional (2D) electron liquid (EL). Our systematic study is based on a generalized $GW$ approximation which makes use of the many-body local fields and takes advantage of the results of the most recent QMC calculations of the static charge- and spin-response of the 2D EL. We report extensive calculations for the many-body effective mass enhancement over a broad range of electron densities. In this respect we critically examine the relative merits of the on-shell approximation, commonly used in weak-coupling situations, {\it versus} the actual self-consistent solution of the Dyson equation. We show that already for $r_s \simeq 3$ and higher, a solution of the Dyson equation proves here necessary in order to obtain a well behaved effective mass. Finally we also show that our theoretical results for a quasi-2D EL, free of any adjustable fitting parameters, are in good qualitative agreement with some recent measurements in a GaAs/AlGaAs heterostructure.
dc.description12 pages, 3 figures, CMT28 Conference Proceedings, work related to cond-mat/0412260
dc.identifierhttps://arxiv.org/abs/cond-mat/0412665
dc.identifierhttp://arxiv.org/abs/cond-mat/0412665
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25571
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleMany-body effective mass enhancement in a two-dimensional electron liquid
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