Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin precession and spin waves in a chiral electron gas: beyond Larmor's
  theorem   Larmor's theorem holds for magnetic systems that are invariant under spin
rotation. In the presence of spin-orbit coupling this invariance is lost and
Larmor's theorem is broken: for systems of interacting electrons, this gives
rise to a subtle interplay between the spin-orbit coupling acting on individual
single-particle states and Coulomb many-body effects. We consider a
quasi-two-dimensional, partially spin-polarized electron gas in a semiconductor
quantum well in the presence of Rashba and Dresselhaus spin-orbit coupling.
Using a linear-response approach based on time-dependent density-functional
theory, we calculate the dispersions of spin-flip waves. We obtain analytic
results for small wave vectors and up to second order in the Rashba and
Dresselhaus coupling strengths $\alpha$ and $\beta$. Comparison with
experimental data from inelastic light scattering allows us to extract $\alpha$
and $\beta$ as well as the spin-wave stiffness very accurately. We find
significant deviations from the local density approximation for spin-dependent
electron systems.

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The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph