Pseudogap Regime of a Two-dimensional Uniform Fermi Gas

Matsumoto, Morio; Hanai, Ryo; Inotani, Daisuke; Ōhashi, Y.

doi:10.7566/jpsj.87.014301

Cited by 4 publications

(4 citation statements)

References 84 publications

(163 reference statements)

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“…It is a key point also for properties of carbon nanotubes [43,44], organic conductors [45][46][47], as well as nuclear pasta in neutron star crusts [48,49]. In ultracold atom physics, two-dimensional pseudogap effects have attracted much attention [50][51][52][53][54][55][56][57][58][59][60] because these many-body effects are expected to be more visible than three-dimensional (3D) systems. Along this direction, the pseudogap in a onedimensional (1D) cold atomic system would be a fascinating topic.…”

Section: Introductionmentioning

confidence: 99%

Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases

Tajima

Tsutsui

Doi

2020

Phys. Rev. Research

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The pseudogap is a ubiquitous phenomenon in strongly correlated systems, such as high-T c superconductors, ultracold atoms, and nuclear physics. Whereas pairing fluctuations inducing the pseudogap are known to be enhanced in low-dimensional systems, such effects have not been explored well in one of the most fundamental one-dimensional models, that is, Gaudin-Yang model. In this paper, we show how the pseudogap effect emerges in the single-particle excitation in this system using a diagrammatic approach. Fermionic single-particle spectra exhibit a unique crossover from the double-particle dispersion to the pseudogap state with increasing the attractive interaction and the number density at finite temperature. Surprisingly, our results of thermodynamic quantities in unpolarized and polarized gases show an excellent agreement with the recent quantum Monte Carlo and complex Langevin results, indicating the validity of our approach even in the region where the pseudogap appears.

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Section: Introductionmentioning

confidence: 99%

Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases

Tajima

Tsutsui

Doi

2020

Phys. Rev. Research

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“…The other is the dimensionless attractive-interaction strength u = U/t . In the two-dimensional limit (r → 0), the pair condensation at a finite temperature is expected to be replaced by the Berezinskii-Kosterlitz-Thouless (BKT) transition [11][12][13][14][15][16][17]. In this paper, we focus on a finite-r regime (r 0.05) and do not discuss the BKT transition.…”

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confidence: 99%

Dimensionality-induced BCS-BEC crossover in layered superconductors

Adachi

Ikeda

2018

Phys. Rev. B

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Based on a simple model of a layered superconductor with strong attractive interaction, we find that the separation of the pair-condensation temperature from the pair-formation temperature becomes more remarkable as the interlayer hopping gets smaller. We propose from this result the BCS-BEC crossover induced by the change in dimensionality, for instance, due to insertion of additional insulating layers or application of uniaxial pressure. The emergence of a pseudogap in the electronic density of states, which supports the idea of the dimensionality-induced BCS-BEC crossover, is also verified. arXiv:1809.01837v2 [cond-mat.supr-con]

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“…In future works the manybody pairing should be carefully examined. The appearance of 2D many-body pairing at high temperature in the crossover regime remains an interesting and controversial topic to be explored [40,[57][58][59].…”

Section: Discussionmentioning

confidence: 99%

Role of the confinement-induced effective range in the thermodynamics of a strongly correlated Fermi gas in two dimensions

Mulkerin

Liu

2020

Phys. Rev. A

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We theoretically investigate the thermodynamic properties of a strongly correlated twodimensional Fermi gas with a confinement-induced negative effective range of interactions, which is described by a two-channel model Hamiltonian. By extending the many-body T -matrix approach by Nozières and Schmitt-Rink to the two-channel model, we calculate the equation of state in the normal phase and present several thermodynamic quantities as functions of temperature, interaction strength, and effective range. We find that there is a non-trivial dependence of thermodynamics on the effective range. In experiment, where the effective range is set by the tight axial confinement, the contribution of the effective range becomes non-negligible as the temperature decreases down to the degenerate temperature. We compare our finite-range results with recent measurements on the density equation of state, and show that the effective range has to be taken into account for the purpose of a quantitative understanding of the experimental data. arXiv:1909.03578v1 [cond-mat.quant-gas]

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Pseudogap Regime of a Two-dimensional Uniform Fermi Gas

Cited by 4 publications

References 84 publications

Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases

Low-dimensional fluctuations and pseudogap in Gaudin-Yang Fermi gases

Dimensionality-induced BCS-BEC crossover in layered superconductors

Role of the confinement-induced effective range in the thermodynamics of a strongly correlated Fermi gas in two dimensions

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