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
Y1 - 2011
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
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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 -