### Abstract

We investigate the stability of π-phase in a polarized superfluid Fermi gas (N_{↑} > N_{↓}, where N_{σ} 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.

Original language | English |
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Title of host publication | Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011 |

Pages | 32-35 |

Number of pages | 4 |

DOIs | |

Publication status | Published - 2011 |

Event | 2011 1st International Symposium on Access Spaces, ISAS 2011 - Yokohama, Japan Duration: 2011 Jun 17 → 2011 Jun 19 |

### Other

Other | 2011 1st International Symposium on Access Spaces, ISAS 2011 |
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Country | Japan |

City | Yokohama |

Period | 11/6/17 → 11/6/19 |

### Fingerprint

### Keywords

- π-phase
- cold Fermi gas
- Fermi superfluid
- ferromagnet
- magnetic junction

### ASJC Scopus subject areas

- Computer Networks and Communications
- Electrical and Electronic Engineering

### Cite this

*Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011*(pp. 32-35). [5960916] https://doi.org/10.1109/ISAS.2011.5960916

**Superfluid/ferromagnet/superfluid-junction and π-phase in a superfluid Fermi gas at finite temperatures.** / Kashimura, Takashi; Tsuchiya, S.; Ohashi, Yoji.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011.*, 5960916, pp. 32-35, 2011 1st International Symposium on Access Spaces, ISAS 2011, Yokohama, Japan, 11/6/17. https://doi.org/10.1109/ISAS.2011.5960916

}

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, Yoji

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 - π-phase

KW - cold Fermi gas

KW - Fermi superfluid

KW - ferromagnet

KW - magnetic junction

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

SP - 32

EP - 35

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

ER -