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Plasmon mass and Drude weight in strongly spin-orbit-coupled two-dimensional electron gases

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dc.creator Agarwal, Amit en_US
dc.creator Chesi, Stefano en_US
dc.creator Jungwirth, T. en_US
dc.creator Sinova, Jairo en_US
dc.creator Vignale, G. en_US
dc.creator Polini, Marco. en_US
dc.date.accessioned 2012-09-19T20:05:47Z
dc.date.available 2012-09-19T20:05:47Z
dc.date.issued 2011 en_US
dc.identifier.citation Amit Agarwal, Stefano Chesi, T. Jungwirth, Jairo Sinova, G. Vignale and Marco Polini. Phys.Rev.B 83 115135 2011."Copyright (2011) by the American Physical Society." en_US
dc.identifier.uri http://dx.doi.org/10.1103/PhysRevB.83.115135 en_US
dc.identifier.uri http://hdl.handle.net/1969.1/146835
dc.description Journals published by the American Physical Society can be found at http://journals.aps.org/ en_US
dc.description.abstract Spin-orbit-coupled two-dimensional electron gases (2DEGs) are a textbook example of helical Fermi liquids, i.e., quantum liquids in which spin (or pseudospin) and momentum degrees of freedom at the Fermi surface have a well-defined correlation. Here we study the long-wavelength plasmon dispersion and the Drude weight of archetypical spin-orbit-coupled 2DEGs. We first show that these measurable quantities are sensitive to electron-electron interactions due to broken Galilean invariance and then discuss in detail why the popular random phase approximation is not capable of describing the collective dynamics of these systems even at very long wavelengths. This work is focused on presenting approximate microscopic calculations of these quantities based on the minimal theoretical scheme that captures the basic physics correctly, i.e., the time-dependent Hartree-Fock approximation. We find that interactions enhance the "plasmon mass" and suppress the Drude weight. Our findings can be tested by inelastic light scattering, electron energy loss, and far-infrared optical-absorption measurements. en_US
dc.language.iso en en_US
dc.publisher American Physical Society en_US
dc.rights This work is archived in the Texas A&M Digital Repository with the express permission of the rights holder (commonly but not always the publisher). A copy of the permission document is on file with the Texas A&M University Libraries. en_US
dc.subject SINGLE DIRAC CONE en_US
dc.subject SPINTRONICS en_US
dc.subject EXCITATIONS en_US
dc.subject SCATTERING en_US
dc.subject SYSTEMS en_US
dc.subject SURFACE en_US
dc.subject Physics en_US
dc.title Plasmon mass and Drude weight in strongly spin-orbit-coupled two-dimensional electron gases en_US
dc.type Article en_US
local.department Physics and Astronomy en_US

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