Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin squeezing in a spin-orbit coupled Bose-Einstein condensate   We study the spin squeezing in a spin-1/2 Bose-Einstein condensates (BEC)
with Raman induced spin-orbit coupling (SOC). Under the condition of two-photon
resonance and weak Raman coupling strength, the system possesses two degenerate
ground states, using which we construct an effective two-mode model. The
Hamiltonian of the two-mode model takes the form of the one-axis-twisting
Hamiltonian which is known to generate spin squeezing. More importantly, we
show that the SOC provides a convenient control knob to adjust the spin
nonlinearity responsible for spin squeezing. Specifically, the spin
nonlinearity strength can be tuned to be comparable to the two-body
density-density interaction, hence is much larger than the intrinsic
spin-dependent interaction strength in conventional two-component BEC systems
such as $^{87}$Rb and $^{23}$Na in the absence of the SOC. We confirm the spin
squeezing by carrying out a fully beyond-mean-field numerical calculation using
the truncated Wigner method. Additionally, the experimental implementation is
also discussed.

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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: econ