##### URI
http://hdl.handle.net/10355/7782
 dc.contributor.author Asgari, R. eng dc.contributor.author Davoudi, B. eng dc.contributor.author Polini, Marco eng dc.contributor.author Tosi, M. P. eng dc.contributor.author Giuliani, Gabriele, 1953- eng dc.contributor.author Vignale, Giovanni, 1957- eng dc.date.issued 2004 eng dc.description http://arxiv.org/PS_cache/cond-mat/pdf/0412/0412665v1.pdf eng dc.description.abstract Motivated 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. eng dc.description.sponsorship One of us (M.P.) gratefully acknowledges the hospitality of Giovanni Vignale at the Department of Physics and Astronomy of the University of Missouri-Columbia and partial support fromWashington University and from the Division of Undergraduate Education of the U.S. National Science Foundation through grant DUE-0127488 to the Shodor Education Foundation, Inc. This work was partially supported by MIUR through the PRIN2001 and PRIN2003 programs. G.V. acknowledges support eng from NSF Grant No. DMR 0313681. dc.identifier.citation arXiv:cond-mat/0412665v1 eng dc.identifier.uri http://hdl.handle.net/10355/7782 eng dc.language English eng dc.publisher arXiv eng dc.relation.ispartofcollection University of Missouri--Columbia. College of Arts and Sciences. Department of Physics and Astronomy. Physics and Astronomy publications eng dc.subject Mesoscopic Systems eng dc.subject.lcsh Condensed matter eng dc.subject.lcsh Quantum Hall effect eng dc.subject.lcsh Electron configuration eng dc.title Many-body effective mass enhancement in a two-dimensional electron liquid eng dc.type Article eng
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