Spin-independent effective mass in a valley-degenerate electron system

Abstract

In a generic spin-polarized Fermi liquid, the masses of spin-up and spin-down electrons are expected to be different and to depend on the degree of polarization. This expectation is not confirmed by the experiments on two-dimensional heterostructures. We consider a model of an $N$-fold degenerate electron gas. It is shown that in the large-N limit, the mass is enhanced via a polaronic mechanism of emission/absorption of virtual plasmons. As plasmons are classical collective excitations, the resulting mass does not depend on $N$, and thus on polarization, to the leading order in 1/N. We evaluate the 1/N corrections and show that they are small even for N=2.

5 pages, 3 figures

References in corpus (8)

• The low-density spin susceptibility and effective mass of mobile electrons in Si inversion layers
• Universal Aspects of Coulomb Frustrated Phase Separation
• Dilute electron gas near the metal-insulator transition in two dimensions
• Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system
• Interaction corrections at intermediate temperatures: magneto-resistance in parallel field
• Role of finite layer thickness in spin-polarization of GaAs 2D electrons in strong parallel magnetic fields
• Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom
• Multicomponent dense electron gas as a model of Si MOSFET

Cited by in corpus (16)

• Nonanalytic paramagnetic response of itinerant fermions away and near a ferromagnetic quantum phase transition
• Effective mass suppression in dilute, spin-polarized two-dimensional electron systems
• Theory of a chiral Fermi liquid: general formalism
• Contrast between spin and valley degrees of freedom
• Effective mass suppression upon complete spin-polarization in an isotropic two-dimensional electron system
• Probing Electron Interactions in a Two-Dimensional System by Quantum Magneto-Oscillations
• Effective mass suppression in a ferromagnetic two-dimensional electron liquid
• Effective Mass and Spin Susceptibility of Dilute Two-Dimensional Holes in GaAs
• Dependence of Effective Mass on Spin and Valley Degrees of Freedom
• $m^{\ast }$ of two-dimensional electron gas: a neural canonical transformation study
• Two-dimensional system of strongly interacting electrons in silicon (100) structures
• Two dimensional electrons in (100) oriented silicon field effect structures in the region of low concentrations and high mobilities
• Universal and non-universal renormalizations in Fermi liquids
• Dynamical susceptibility of a Fermi liquid
• Quantum Phase Transition of the Electron-Hole Liquid In the Coupled Quantum Wells
• Spin polarization dependence of quasiparticle properties in graphene