Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Spin Dynamics in a Normal Bose Gas with Spin-orbit Coupling   In this Letter, we investigate spin dynamics of a two-component Bose gas with
spin-orbit coupling realised in cold atom experiments. We derive coupled
hydrodynamic equations for number and spin densities as well as their
associated currents. Specialising to quasi-one-dimensional situation, we obtain
analytic solutions of the spin helix structure and its dynamics in both
adiabatic and diabatic regimes. In the adiabatic regime, the transverse spin
decays parabolically in the short-time limit and exponentially in the long time
limit, depending on initial polarisation. In contrast, in the diabatic regime,
transverse spin density and current oscillate in a way similar to the
charge-current oscillation in an undamped LC circuit. The effects of Rabi
coupling on the short-time spin dynamics is also discussed. Finally, using
realistic experimental parameters for $^{87}$Rb, we show that the time scales
for spin dynamics is of order of milliseconds to a few seconds and can be
observed experimentally.

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The categories of this paper are: hep-ph
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga