TY - GEN

T1 - Superfluid/ferromagnet/superfluid-junction and π-phase in a superfluid Fermi gas at finite temperatures

AU - Kashimura, Takashi

AU - Tsuchiya, S.

AU - Ohashi, Y.

PY - 2011/8/23

Y1 - 2011/8/23

N2 - We investigate the stability of π-phase in a polarized superfluid Fermi gas (N↑ > N↓, where Nσ is the number of atoms in the hyperfine state described by pseudospin-σ). In our previous paper [T. Kashimura, S. Tsuchiya, and Y. Ohashi, Phys. Rev. A 82, 033617 (2010)], we showed that excess atoms (ΔN = N↑ - N↓) localized around a potential barrier embedded in the system induces the π-phase at T = 0, where the phase of superfluid order parameter differ by π across the junction. In this paper, we extend our previous work to include temperature effects within the mean-field theory. We show that the π-phase is stable even at finite temperatures, although transition from the π-phase to 0-phase eventually occurs at a certain temperature. Our results indicate that the π-phase is experimentally accessible in cold Fermi gases.

AB - We investigate the stability of π-phase in a polarized superfluid Fermi gas (N↑ > N↓, where Nσ is the number of atoms in the hyperfine state described by pseudospin-σ). In our previous paper [T. Kashimura, S. Tsuchiya, and Y. Ohashi, Phys. Rev. A 82, 033617 (2010)], we showed that excess atoms (ΔN = N↑ - N↓) localized around a potential barrier embedded in the system induces the π-phase at T = 0, where the phase of superfluid order parameter differ by π across the junction. In this paper, we extend our previous work to include temperature effects within the mean-field theory. We show that the π-phase is stable even at finite temperatures, although transition from the π-phase to 0-phase eventually occurs at a certain temperature. Our results indicate that the π-phase is experimentally accessible in cold Fermi gases.

KW - Fermi superfluid

KW - cold Fermi gas

KW - ferromagnet

KW - magnetic junction

KW - π-phase

UR - http://www.scopus.com/inward/record.url?scp=80051812537&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80051812537&partnerID=8YFLogxK

U2 - 10.1109/ISAS.2011.5960916

DO - 10.1109/ISAS.2011.5960916

M3 - Conference contribution

AN - SCOPUS:80051812537

SN - 9781457707179

T3 - Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011

SP - 32

EP - 35

BT - Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011

T2 - 2011 1st International Symposium on Access Spaces, ISAS 2011

Y2 - 17 June 2011 through 19 June 2011

ER -