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
from NSF Grant No. DMR 0313681. | eng |
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 |