Momentum relaxation of the spin distribution function caused by electron-electron scattering in a two-dimensional Fermi gas

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy Physical Review B Pub Date : 2025-03-26 DOI:10.1103/physrevb.111.125308

O. E. Raichev

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Abstract

The influence of Coulomb interaction on the relaxation of the spin distribution function over the directions of electron momenta is studied by calculating the angular harmonics of the linearized electron-electron collision integral at low temperatures, when the electron gas is degenerate. It is shown that the relaxation rates of the spin distribution function of two-dimensional electron gas are substantially different for even and odd angular harmonics. For even harmonics, the relaxation rate of the spin distribution function is equal to the relaxation rate of the density distribution function, demonstrating a logarithmic increase with the number of harmonic and T2 temperature dependence. For odd harmonics, the relaxation rate does not depend on the number of harmonic and depends on temperature as T2ln(ɛF/T), where ɛF is the Fermi energy. The results are used for theoretical investigation of the temperature dependence of spin accumulation rates relating the intensity of external spin pumping with nonequilibrium spin polarization in the electron gas with spin-orbit coupling. This dependence has a maximum when the collisional broadening energy governed by electron-electron scattering exceeds the spin splitting energy, and is sensitive to the difference in the relaxation rates for even and odd harmonics.

Published by the American Physical Society

2025

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二维费米气体中电子-电子散射引起的自旋分布函数的动量松弛

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来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter