TY - JOUR

T1 - Rashbon Bound States Associated with a Spherical Spin–Orbit Coupling in an Ultracold Fermi Gas with an s-Wave Interaction

AU - Yamaguchi, T.

AU - Inotani, Daisuke

AU - Ohashi, Yoji

PY - 2016/3/3

Y1 - 2016/3/3

N2 - We investigate the formation of rashbon bound states and strong-coupling effects in an ultracold Fermi gas with a spherical spin–orbit interaction, (Formula presented.) (where (Formula presented.) are Pauli matrices). Extending the strong-coupling theory developed by Nozières and Schmitt-Rink (NSR) to include this spin–orbit coupling, we determine the superfluid phase transition temperature (Formula presented.), as functions of the strength of a pairing interaction (Formula presented.), as well as the spin–orbit coupling strength (Formula presented.). Evaluating poles of the NSR particle–particle scattering matrix describing fluctuations in the Cooper channel, we clarify the region where rashbon bound states dominate the superfluid phase transition in the (Formula presented.)–(Formula presented.) phase diagram. Since the antisymmetric spin–orbit interaction (Formula presented.) breaks the inversion symmetry of the system, rashbon bound states naturally have not only a spin-singlet and even-parity symmetry, but also a spin-triplet and odd-parity symmetry. Thus, our results would be also useful for the study of this parity-mixing effect in the BCS–BEC crossover regime of a spin–orbit coupled Fermi gas.

AB - We investigate the formation of rashbon bound states and strong-coupling effects in an ultracold Fermi gas with a spherical spin–orbit interaction, (Formula presented.) (where (Formula presented.) are Pauli matrices). Extending the strong-coupling theory developed by Nozières and Schmitt-Rink (NSR) to include this spin–orbit coupling, we determine the superfluid phase transition temperature (Formula presented.), as functions of the strength of a pairing interaction (Formula presented.), as well as the spin–orbit coupling strength (Formula presented.). Evaluating poles of the NSR particle–particle scattering matrix describing fluctuations in the Cooper channel, we clarify the region where rashbon bound states dominate the superfluid phase transition in the (Formula presented.)–(Formula presented.) phase diagram. Since the antisymmetric spin–orbit interaction (Formula presented.) breaks the inversion symmetry of the system, rashbon bound states naturally have not only a spin-singlet and even-parity symmetry, but also a spin-triplet and odd-parity symmetry. Thus, our results would be also useful for the study of this parity-mixing effect in the BCS–BEC crossover regime of a spin–orbit coupled Fermi gas.

KW - BCS–BEC crossover

KW - Rashbon

KW - Spin–orbit coupling

KW - Ultracold Fermi gas

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U2 - 10.1007/s10909-016-1558-0

DO - 10.1007/s10909-016-1558-0

M3 - Article

AN - SCOPUS:84960115674

SP - 1

EP - 8

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

SN - 0022-2291

ER -