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

Takashi Kashimura; S. Tsuchiya; Y. Ohashi

doi:10.1109/ISAS.2011.5960916

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

Takashi Kashimura, S. Tsuchiya, Y. Ohashi

Department of Physics

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

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
Title of host publication	Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011
Pages	32-35
Number of pages	4
DOIs	https://doi.org/10.1109/ISAS.2011.5960916
Publication status	Published - 2011 Aug 23
Event	2011 1st International Symposium on Access Spaces, ISAS 2011 - Yokohama, Japan Duration: 2011 Jun 17 → 2011 Jun 19

Publication series

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

Other

Other	2011 1st International Symposium on Access Spaces, ISAS 2011
Country	Japan
City	Yokohama
Period	11/6/17 → 11/6/19

Keywords

Fermi superfluid
cold Fermi gas
ferromagnet
magnetic junction
π-phase

ASJC Scopus subject areas

Computer Networks and Communications
Electrical and Electronic Engineering

Access to Document

10.1109/ISAS.2011.5960916

Fingerprint Dive into the research topics of 'Superfluid/ferromagnet/superfluid-junction and π-phase in a superfluid Fermi gas at finite temperatures'. Together they form a unique fingerprint.

Cite this

Kashimura, T., Tsuchiya, S., & Ohashi, Y. (2011). Superfluid/ferromagnet/superfluid-junction and π-phase in a superfluid Fermi gas at finite temperatures. In Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011 (pp. 32-35). [5960916] (Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011). 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, Y.

Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011. 2011. p. 32-35 5960916 (Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011).

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

Kashimura, T, Tsuchiya, S & Ohashi, Y 2011, Superfluid/ferromagnet/superfluid-junction and π-phase in a superfluid Fermi gas at finite temperatures. in Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011., 5960916, Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011, 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

@inproceedings{e544f091545b42698d4813f6c872859c,

title = "Superfluid/ferromagnet/superfluid-junction and π-phase in a superfluid Fermi gas at finite temperatures",

abstract = "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.",

keywords = "Fermi superfluid, cold Fermi gas, ferromagnet, magnetic junction, π-phase",

author = "Takashi Kashimura and S. Tsuchiya and Y. Ohashi",

year = "2011",

month = aug,

day = "23",

doi = "10.1109/ISAS.2011.5960916",

language = "English",

isbn = "9781457707179",

series = "Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011",

pages = "32--35",

booktitle = "Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011",

note = "2011 1st International Symposium on Access Spaces, ISAS 2011 ; Conference date: 17-06-2011 Through 19-06-2011",

}

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 -