Resonant scattering effect in spectroscopies of interacting atomic gases

Leskinen, M. J.; Kajala, J.; Kinnunen, Jami J.

doi:10.1088/1367-2630/12/8/083041

Cited by 4 publications

(4 citation statements)

References 49 publications

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“…( 15) is in contradiction with the expected pseudogap physics at high temperatures [9] but this is a direct consequence of the choice of the ansatz. However, despite this deficit, the ansatz used here is in agreement with experiments that have been used for trying to observe the pseudogap phenomena [53,54].…”

Section: Discussion On the Modelsupporting

confidence: 70%

Hartree shift in unitary Fermi gases

Kinnunen

2012

Phys. Rev. A

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The Hartree energy shift is calculated for a unitary Fermi gas. By including the momentum dependence of the scattering amplitude explicitly, the Hartree energy shift remains finite even at unitarity. Extending the theory also for spin-imbalanced systems allows calculation of polaron properties. The results are in good agreement with more involved theories and experiments.Comment: 31 pages, many figure

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Section: Discussion On the Modelsupporting

confidence: 70%

Hartree shift in unitary Fermi gases

Kinnunen

2012

Phys. Rev. A

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“…The process described in the diagram C involves dynamics generated by the creation of the hole excitation [38], and it does not influence ground state properties, such as the momentum distribution. Fig.…”

Section: Resultsmentioning

confidence: 99%

Momentum-resolved spectroscopy of a Fermi liquid

Doggen

Kinnunen

2015

Sci Rep

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We consider a recent momentum-resolved radio-frequency spectroscopy experiment, in which Fermi liquid properties of a strongly interacting atomic Fermi gas were studied. Here we show that by extending the Brueckner-Goldstone model, we can formulate a theory that goes beyond basic mean-field theories and that can be used for studying spectroscopies of dilute atomic gases in the strongly interacting regime. The model hosts well-defined quasiparticles and works across a wide range of temperatures and interaction strengths. The theory provides excellent qualitative agreement with the experiment. Comparing the predictions of the present theory with the mean-field Bardeen-Cooper-Schrieffer theory yields insights into the role of pair correlations, Tan's contact, and the Hartree mean-field energy shift.

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“…Neglecting the final-state effects [29] and using the linear response theory, the current can be expressed as a convolution of the spatially dependent spectral function A(k,ω,r) and the Fermi distribution [13,30] where is the detuning frequency, R F denotes the Thomas-Fermi radius, and corresponds to the tunneling matrix, which we assume as a constant.…”

Section: Effects Of Spatial Inhomogeneitymentioning

confidence: 99%

Spectroscopic Bogoliubov features near the unitary limit

Domański

2011

Phys. Rev. A

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We analyze the single particle excitation spectrum of the ultracold fermion atom system close to the unitary limit where there has been found experimental evidence for the Bogoliubov quasiparticles below as well as above the transition temperature Tc. We consider the short-range correlations originating from the preformed pairs and try to reproduce the experimental data adapting phenomenological selfenergy previously used for description of the anti-nodal spectra of the underdoped cuprate superconductors. We show that it fairly fits the lineshapes obtained by the momentum resolved RF spectroscopy for {40}^K atoms.Comment: 4 pages + epsilo

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Resonant scattering effect in spectroscopies of interacting atomic gases

Cited by 4 publications

References 49 publications

Hartree shift in unitary Fermi gases

Hartree shift in unitary Fermi gases

Momentum-resolved spectroscopy of a Fermi liquid

Spectroscopic Bogoliubov features near the unitary limit

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