Dynamical response of ultracold interacting fermion–boson mixtures

Jia, Kai; Maier, Stefan A.; Komnik, A.

doi:10.1016/j.physb.2014.07.075

Cited by 1 publication

(7 citation statements)

References 35 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(27). In an earlier work [44], we have studied the fermion-phonon correlation in Bragg spectra by a random phase approximation (RPA). That formalism has an advantage to reveal the interaction effects in a simple way.…”

Section: Sws In Fermion-boson Mixturesmentioning

confidence: 99%

“…In Ref. [44] it was shown that RPA cannot recover the SWS, hence an alternative one is necessary. In this section we shall take into account the contribution from a two-phonon process, and compare the diagrammatic calculations with the numerically exact path integral QMC results [51].…”

Section: Vertex Correction and The Swsmentioning

confidence: 99%

“…The technical details of QMC simulations are described in Ref. [44]. In order to improve the spectral resolution, in the present work we have increased the size of 1D system to 41 states.…”

Section: Vertex Correction and The Swsmentioning

confidence: 99%

“…(A1), a partial integration has been applied (x ′ refers to the coordinate of the impurity). Next we make The details of RPA calculation have been elaborated in an earlier paper [44]. Here we only outline the main procedure together with the representative result for a 1D system.…”

Section: Appendix A: Drag Force On Fermionic Impurities Interacting Wmentioning

confidence: 99%

“…Earlier theoretical studies on the BEC polaron have identified characteristic phonon-induced structures in the Bragg spectra of impurities [42][43][44], indicative of polaron formation in the system. In addition, quantum Monte Carlo (QMC) simulations revealed a highly nontrivial feature in the excitation spectra of such mixtures [44] -a characteristic suppression of spectral weight in response functions. However, the presence of this spectral weight suppression (SWS) was not corroborated in other analytical works and its origin remains a puzzle.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Spectral weight suppression in response functions of ultracold fermion-boson mixtures

Jia

Komnik

2016

Phys. Rev. A

Self Cite

View full text Add to dashboard Cite

We study the dynamical response of ultracold fermion-boson mixture in the Bogoliubov regime, where the interactions between fermionic impurities and bosonic excitations (phonons) are described by an effective Fröhlich model under the Bogoliubov approximation. A characteristic suppression of the single-particle spectral weight is found in the small momentum region where the impurity band and phonon mode intersect. Using diagrammatic technique we compute the Bragg spectra as well as the momentum dependent force-force correlation function. We find that both of them are heavily affected by the spectral weight suppression effect at low impurity densities in both 1D and 2D systems. We show that the the spectral weight suppression feature in Bragg spectra, which was previously found in the quantum Monte Carlo simulations and which cannot be recovered by the random phase approximation, can be accurately reproduced with the help of vertex corrections.

show abstract

Section: Sws In Fermion-boson Mixturesmentioning

confidence: 99%

Section: Vertex Correction and The Swsmentioning

confidence: 99%

“…The technical details of QMC simulations are described in Ref. [44]. In order to improve the spectral resolution, in the present work we have increased the size of 1D system to 41 states.…”

Section: Vertex Correction and The Swsmentioning

confidence: 99%

Section: Appendix A: Drag Force On Fermionic Impurities Interacting Wmentioning

confidence: 99%