Two-dimensional pseudogap effects of an ultracold fermi gas in the BCS-BEC crossover region

R. Watanabe; S. Tsuchiya; Y. Ohashi

doi:10.1007/s10909-012-0691-7

Two-dimensional pseudogap effects of an ultracold fermi gas in the BCS-BEC crossover region

R. Watanabe, S. Tsuchiya, Y. Ohashi

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We investigate pseudogap phenomena originating from pairing fluctuations in the BCS-BEC crossover regime of a two-dimensional Fermi gas in a harmonic trap. Including pairing fluctuations within a T -matrix theory and effects of a trap within the local density approximation, we calculate the local density of states (LDOS) at the superfluid phase transition temperature Tc. In the weak-coupling regime, we show that the pseudogap already appears in LDOS around the trap center. The spatial region where the pseudogap can be seen in LDOS becomes wider for a strong pairing interaction. We also discuss how the pseudogap affects the spectrum of the photoemission-type experiment developed by JILA group.

Original language	English
Pages (from-to)	341-347
Number of pages	7
Journal	Journal of Low Temperature Physics
Volume	171
Issue number	3-4
DOIs	https://doi.org/10.1007/s10909-012-0691-7
Publication status	Published - 2013 May

Keywords

Cold Fermi gas
Low-dimensionality
Pseudogap

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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10.1007/s10909-012-0691-7

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title = "Two-dimensional pseudogap effects of an ultracold fermi gas in the BCS-BEC crossover region",

abstract = "We investigate pseudogap phenomena originating from pairing fluctuations in the BCS-BEC crossover regime of a two-dimensional Fermi gas in a harmonic trap. Including pairing fluctuations within a T -matrix theory and effects of a trap within the local density approximation, we calculate the local density of states (LDOS) at the superfluid phase transition temperature Tc. In the weak-coupling regime, we show that the pseudogap already appears in LDOS around the trap center. The spatial region where the pseudogap can be seen in LDOS becomes wider for a strong pairing interaction. We also discuss how the pseudogap affects the spectrum of the photoemission-type experiment developed by JILA group.",

keywords = "Cold Fermi gas, Low-dimensionality, Pseudogap",

author = "R. Watanabe and S. Tsuchiya and Y. Ohashi",

note = "Funding Information: Acknowledgements We would like to thank S. Watabe, T. Kashimura, D. Inotani, and R. Hanai for fruitful discussions. R.W. was supported by the Japan Society for the Promotion of Science. Y.O. was supported by Grant-in-Aid for Scientific research from MEXT in Japan (22540412, 23104723, 23500056).",

year = "2013",

month = may,

doi = "10.1007/s10909-012-0691-7",

language = "English",

volume = "171",

pages = "341--347",

journal = "Journal of Low Temperature Physics",

issn = "0022-2291",

publisher = "Springer New York",

number = "3-4",

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TY - JOUR

T1 - Two-dimensional pseudogap effects of an ultracold fermi gas in the BCS-BEC crossover region

AU - Watanabe, R.

AU - Tsuchiya, S.

AU - Ohashi, Y.

N1 - Funding Information: Acknowledgements We would like to thank S. Watabe, T. Kashimura, D. Inotani, and R. Hanai for fruitful discussions. R.W. was supported by the Japan Society for the Promotion of Science. Y.O. was supported by Grant-in-Aid for Scientific research from MEXT in Japan (22540412, 23104723, 23500056).

PY - 2013/5

Y1 - 2013/5

N2 - We investigate pseudogap phenomena originating from pairing fluctuations in the BCS-BEC crossover regime of a two-dimensional Fermi gas in a harmonic trap. Including pairing fluctuations within a T -matrix theory and effects of a trap within the local density approximation, we calculate the local density of states (LDOS) at the superfluid phase transition temperature Tc. In the weak-coupling regime, we show that the pseudogap already appears in LDOS around the trap center. The spatial region where the pseudogap can be seen in LDOS becomes wider for a strong pairing interaction. We also discuss how the pseudogap affects the spectrum of the photoemission-type experiment developed by JILA group.

AB - We investigate pseudogap phenomena originating from pairing fluctuations in the BCS-BEC crossover regime of a two-dimensional Fermi gas in a harmonic trap. Including pairing fluctuations within a T -matrix theory and effects of a trap within the local density approximation, we calculate the local density of states (LDOS) at the superfluid phase transition temperature Tc. In the weak-coupling regime, we show that the pseudogap already appears in LDOS around the trap center. The spatial region where the pseudogap can be seen in LDOS becomes wider for a strong pairing interaction. We also discuss how the pseudogap affects the spectrum of the photoemission-type experiment developed by JILA group.

KW - Cold Fermi gas

KW - Low-dimensionality

KW - Pseudogap

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U2 - 10.1007/s10909-012-0691-7

DO - 10.1007/s10909-012-0691-7

M3 - Article

AN - SCOPUS:84892958128

SN - 0022-2291

VL - 171

SP - 341

EP - 347

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 3-4

ER -

Two-dimensional pseudogap effects of an ultracold fermi gas in the BCS-BEC crossover region

Abstract

Keywords

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