Charge and spin density response functions of the clean two-dimensional electron gas with Rashba spin-orbit coupling at finite momenta and frequencies

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.

15 pages, 9 figures

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• Plasmon mass and Drude weight in strongly spin-orbit-coupled 2D electron gases
• Spin susceptibility of interacting two-dimensional electrons in the presence of spin-orbit coupling
• Theory of a chiral Fermi liquid: general formalism
• Competing superconducting phases in interacting two-dimensional electron gas with strong Rashba spin-orbit coupling
• Plasmons in spin-orbit coupled two-dimensional hole gas systems
• Carrier-density-controlled anisotropic spin susceptibility of two-dimensional hole systems
• Influence of Dielectric Environment on Role of Spin-Orbit Interaction for Image Potentials