Single-Particle Properties of a Strongly Interacting Bose–Fermi Mixture Above the BEC Phase Transition Temperature

Kharga, Digvijay; Inotani, Daisuke; Hanai, Ryo; Ōhashi, Y.

doi:10.1007/s10909-017-1742-x

Cited by 2 publications

(17 citation statements)

References 19 publications

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“…29-31, 33, 35) The pseudogap phenomenon in this system has been predicted by using this strong-coupling theory. 29,30) TMA has also succeeded in explaining the photoemission spectra 35,39) observed in 40 K Fermi gases. [36][37][38] However, we have recently pointed out that TMA has room for improvement, 40) when it is applied to a Bose-Fermi mixture.…”

Section: Introductionmentioning

confidence: 93%

“…[20][21][22][23][24][25][26][27][28] In the intermediate coupling regime (BCS-BEC crossover region), strong pairing fluctuations are expected to cause the so-called pseudogap phenomenon. [29][30][31][32][33][34][35] Although this expectation has not completely been confirmed experimentally yet, the recent photoemission-type experiments on 40 K Fermi gases have observed a back-bending behavior of single-particle excitations, [36][37][38] being consistent with the pseudogap scenario. [29][30][31][32][33][34][35] Since the pseudogap in this case originates from the formation of (fluctuating) preformed Cooper pairs, it is interesting to explore a similar phenomenon caused by hetero-pairing fluctuations in a Bose-Fermi mixture.…”

Section: Introductionmentioning

confidence: 99%

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Single-Particle Excitations and Effects of Hetero-Pairing Fluctuations in a Bose–Fermi Mixture with a Feshbach Resonance

et al. 2017

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JapanWe theoretically investigate normal-state properties of a gas mixture of single-component bosons and fermions with a hetero-nuclear Feshbach resonance. Including strong heteropairing fluctuations associated with the Feshbach resonance, we calculate single-particle density of states, as well as the spectral weight at various interaction strengths. For this purpose, we employ an improved T -matrix approximation (TMA), where the bare Bose Green's function in the non-selfconsistent TMA self-energy is modified so as to satisfy the Hugenholtz-Pines relation at the Bose-Einstein condensation (BEC) temperature T BEC . In the unitary regime at T BEC , we show that hetero-pairing fluctuations couple Fermi atomic excitations with Fermi molecular excitations, as well as with Bose atomic excitations. Although a similar coupling phenomenon by pairing fluctuations is known to give a pseudo-gapped density of states in the unitary regime of a two-component Fermi gas, such a dip structure is found to not appear even in the unitary limit of a Bose-Fermi mixture. It only appears in the strongcoupling regime. Instead, a spectral peak along the molecular dispersion appears in the spectral weight. We also clarify how this coupling phenomenon is seen in the Bose channel. Since a hetero-nuclear Feshbach resonance, as well as the formation of Bose-Fermi molecules, have been realized, our results would be useful for the study of strong-coupling properties of this unique quantum gas.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Single-Particle Excitations and Effects of Hetero-Pairing Fluctuations in a Bose–Fermi Mixture with a Feshbach Resonance

et al. 2017

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“…41) In this strong-coupling theory, these are determined from the coupled number equations for bosons and fermions,…”

Section: Formulationmentioning

confidence: 99%

“…Indeed, this approach has been started by several groups. [34][35][36][37][38][39][40][41][42] In this paper, we theoretically investigate normal-state properties of a unitary gas mixture of single-component Bose and Fermi atoms, as a typical strongly interacting Bose-Fermi mixture. Including Bose-Fermi hetero-pairing fluctuations associated with a tunable interspecies interaction, we examine strong-coupling corrections to thermodynamic quantities in the unitarity limit.…”

Section: Introductionmentioning

confidence: 99%

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Normal-State Properties of a Unitary Bose–Fermi Mixture: A Combined Strong-Coupling Approach with Universal Thermodynamics

et al. 2017

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JapanWe theoretically investigate normal-state properties of a unitary Bose-Fermi mixture. Including strong hetero-pairing fluctuations, we evaluate the Bose and Fermi chemical potential, internal energy, pressure, entropy, as well as specific heat at constant volume C V , within the framework of a combined strong-coupling theory with exact thermodynamic identities. We show that hetero-pairing fluctuations at the unitarity cause non-monotonic temperature dependence of C V , being qualitatively different from the monotonic behavior of this quantity in the weak-and strong-coupling limit. On the other hand, such an anomalous behavior is not seen in the other quantities. Our results indicate that the specific heat C V , which has recently become observable in cold atom physics, is a useful quantity for understanding strong-coupling aspects of this quantum system.

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Single-Particle Properties of a Strongly Interacting Bose–Fermi Mixture Above the BEC Phase Transition Temperature

Cited by 2 publications

References 19 publications

Single-Particle Excitations and Effects of Hetero-Pairing Fluctuations in a Bose–Fermi Mixture with a Feshbach Resonance

Single-Particle Excitations and Effects of Hetero-Pairing Fluctuations in a Bose–Fermi Mixture with a Feshbach Resonance

Normal-State Properties of a Unitary Bose–Fermi Mixture: A Combined Strong-Coupling Approach with Universal Thermodynamics

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