Enhancing the Efimov correlation in Bose polarons with large mass imbalance

Sun, Mingyuan; Cui, Xiaoling

doi:10.1103/physreva.96.022707

Cited by 21 publications

(26 citation statements)

References 56 publications

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“…It is an expansion in terms of the small fugacity z σ = e βµσ for each component σ. The virial expansion of the single-particle Green function in a spinbalanced Fermi gas was recently developed by Sun and Leyronas [69] and the technique was applied to investigate the Bose polaron at high temperature [70,71]. In this work, we apply the same technique to understand the Fermi polaron at high temperature.…”

Section: B Virial Expansion Theorymentioning

confidence: 99%

Breakdown of the Fermi polaron description near Fermi degeneracy at unitarity

Mulkerin

Liu

2019

Annals of Physics

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We theoretically investigate attractive and repulsive Fermi polarons in three dimensions at finite temperature and impurity concentration through the many-body T -matrix theory and hightemperature virial expansion. By using the analytically continued impurity Green's function, we calculate the direct rf spectroscopy of attractive polarons in the unitary regime. Taking the peak value of the rf spectroscopy as the polaron energy and the full width half maximum as the polaron lifetime, we determine the temperature range of validity for the quasi-particle description of Fermi polarons in the unitary limit. We also explore the temperature and impurity dependence of attractive and repulsive Fermi polarons using the direct and reverse rf spectroscopy. This methodology allows us to directly compare our results to the recent experimental data from the European Laboratory for Non-Linear Spectroscopy [F. Scazza et al., Phys. Rev. Lett. 118, 083602 (2017)].

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Section: B Virial Expansion Theorymentioning

confidence: 99%

Breakdown of the Fermi polaron description near Fermi degeneracy at unitarity

Mulkerin

Liu

2019

Annals of Physics

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“…Similarly, recent results in Refs. [42,43] for the Bose polaron problem suggest that when the size of Efimov trimers becomes comparable to the interparticle scaling, signatures of Efimov physics become visible in the polaron spectrum.…”

Section: R→0mentioning

confidence: 99%

Dynamics of Three-Body Correlations in Quenched Unitary Bose Gases

2018

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We investigate dynamical three-body correlations in the Bose gas during the earliest stages of evolution after a quench to the unitary regime. The development of few-body correlations is theoretically observed by determining the two-and three-body contacts. We find that the growth of three-body correlations is gradual compared to two-body correlations. The three-body contact oscillates coherently, and we identify this as a signature of Efimov trimers. We show that the growth of three-body correlations depends nontrivially on parameters derived from both the density and Efimov physics. These results demonstrate the violation of scaling invariance of unitary bosonic systems via the appearance of log-periodic modulation of three-body correlations.

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“…While the initial theoretical [38,39,[41][42][43][44][45][46][47][48][49][50][51] and experimental [13][14][15][16] work on this problem focused on the effective Fröhlich model valid at weak couplings, it has been realized first in Ref. [28] that additional two-phonon terms need to be included in the Hamiltonian to provide an accurate description of Bose polarons at strong couplings [25][26][27][52][53][54][55][56][57][58][59][60][61][62]. It has been argued recently that, on the attractive side of a Feshbach resonance, two-phonon terms mainly renormalize the effective Fröhlich Hamiltonian describing the Bose polaron [26].…”

Section: Bose Polarons In Bose-einstein Condensatesmentioning

confidence: 99%

Strong-coupling Bose polarons out of equilibrium: Dynamical renormalization-group approach

et al. 2018

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When a mobile impurity interacts with a surrounding bath of bosons, it forms a polaron. Numerous methods have been developed to calculate how the energy and the effective mass of the polaron are renormalized by the medium for equilibrium situations. Here we address the much less studied non-equilibrium regime and investigate how polarons form dynamically in time. To this end, we develop a time-dependent renormalization group approach which allows calculations of all dynamical properties of the system and takes into account the effects of quantum fluctuations in the polaron cloud. We apply this method to calculate trajectories of polarons following a sudden quench of the impurity-boson interaction strength, revealing how the polaronic cloud around the impurity forms in time. Such trajectories provide additional information about the polaron's properties which are challenging to extract directly from the spectral function measured experimentally using ultracold atoms. At strong couplings, our calculations predict the appearance of trajectories where the impurity wavers back at intermediate times as a result of quantum fluctuations. Our method is applicable to a broader class of non-equilibrium problems. As a check, we also apply it to calculate the spectral function and find good agreement with experimental results. At very strong couplings, we predict that quantum fluctuations lead to the appearance of a dark continuum with strongly suppressed spectral weight at low energies. While our calculations start from an effective Fröhlich Hamiltonian describing impurities in a three-dimensional Bose-Einstein condensate, we also calculate the effects of additional terms in the Hamiltonian beyond the Fröhlich paradigm. We demonstrate that the main effect of these additional terms on the attractive side of a Feshbach resonance is to renormalize the coupling strength of the effective Fröhlich model.

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Enhancing the Efimov correlation in Bose polarons with large mass imbalance

Cited by 21 publications

References 56 publications

Breakdown of the Fermi polaron description near Fermi degeneracy at unitarity

Breakdown of the Fermi polaron description near Fermi degeneracy at unitarity

Dynamics of Three-Body Correlations in Quenched Unitary Bose Gases

Strong-coupling Bose polarons out of equilibrium: Dynamical renormalization-group approach

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