Charge and spin density response functions of the clean two-dimensional
electron gas with Rashba spin-orbit coupling at finite momenta and frequencies |
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Authors: | M Pletyukhov S Konschuh |
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Institution: | 1.Institut für Theoretische Festk?rperphysik and Center for Functional Nanostructures, Universit?t Karlsruhe,Karlsruhe,Germany;2.Institut für Theoretische Physik A,Aachen,Germany;3.Institut für Theoretische Physik, Universit?t Regensburg,Regensburg,Germany |
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Abstract: | We analytically evaluate charge and spin density response functions of the
clean two-dimensional electron gas with Rashba spin-orbit coupling at finite
momenta and frequencies. On the basis of our exact expressions we discuss the
accuracy of the long-wavelength and the quasiclassical approximations. We also
derive the static limit of spin susceptibilities and demonstrate,
in particular, how the Kohn-like anomalies in their derivatives are related
to the spin-orbit modification of the Ruderman-Kittel-Kasuya-Yosida
interaction. Taking into account screening and exchange effects of the Coulomb
interaction, we describe the collective charge and spin density excitation
modes which appear to be coupled due to nonvanishing spin-charge response
function. |
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Keywords: | PACS" target="_blank">PACS 71 70 Ej Spin-orbit coupling 73 20 Mf Collective excitations (including excitons polarons plasmons and other charge-density excitations) 73 21 -b Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems |
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