Cooper-pair-condensate fluctuations and plasmons in layered superconductors

Côté, R.; Griffin, Allan

doi:10.1103/physrevb.48.10404

Cited by 77 publications

(97 citation statements)

References 32 publications

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“…The RPA [33] is a standard tool for describing collective modes of interacting fermion systems and it was first applied to the BCS context by Anderson [34]. The method has been used to also describe, e.g., layered superconductors [35] and the BEC-BCS crossover [36,37]. In addition to analyzing the collective mode dispersion and the speed of sound, we also study the damping properties of the collective modes.…”

Section: Introductionmentioning

confidence: 99%

Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state

Heikkinen

Törmä

2011

Phys. Rev. A

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We consider the density response of a spin-imbalanced ultracold Fermi gas in an optical lattice in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. We calculate the collective mode spectrum of the system in the generalised random phase approximation and find that though the collective modes are damped even at zero tempererature, the damping is weak enough to have well-defined collective modes. We calculate the speed of sound in the gas and show that it is anisotropic due to the anisotropy of the FFLO pairing, which implies an experimental signature for the FFLO state.

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Section: Introductionmentioning

confidence: 99%

Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state

Heikkinen

Törmä

2011

Phys. Rev. A

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“…The response of the system to the perturbation U (k, ω)(n ↑ − n ↓ ) in a homogenous system is calculated in the Appendix following the derivation in [10]. The result is that for the homogeneous case, the responses of two components are equal but with opposite signs and no collective modes are excited at any frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…(1−g0R)(g0+a+b) , where we use the integrals a, b, c, d, R as defined in [10]. The reponse of the spin component has the factor (a+b) which at T=0 in the low q,ω region is a…”

Section: Resultsmentioning

confidence: 99%

“…No collective mode of the system is excited if there is no intensity variation in space and time. When considering intensity modulations of the type |Ω| 2 ∼ |Ω 1 | 2 2 cos(ωt − k · r), an Anderson-Bogoliubov phonon can be excited [9][10][11].…”

Section: Resultsmentioning

confidence: 99%

“…] leads in the long wavelength limit to appearance of the Anderson-Bogoliubov phonon [9][10][11], that is, a collective mode with energy below the superconducting gap.…”

Section: The Systemmentioning

confidence: 99%

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Laser-induced collective excitations in a two-component Fermi gas

Rodrı́guez

Törmä

2002

Phys. Rev. A

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We consider the linear density response of a two-component (superfluid) Fermi gas of atoms when the perturbation is caused by laser light. We show that various types of laser excitation schemes can be transformed into linear density perturbations, however, a Bragg spectroscopy scheme is needed for transferring energy and momentum into a collective mode. This makes other types of laser probing schemes insensitive for collective excitations and therefore well suited for the detection of the superfluid order parameter. We show that for the special case when laser light is coupled between the two components of the Fermi gas, density response is always absent in a homogeneous system. 05.30.Fk, 74.25.Gz

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Speed of sound in an optical lattice

Koinov¹

2010

Annalen der Physik

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A system of equal mixture of 6 Li atomic Fermi gas of two hyperfine states loaded into a cubic threedimensional optical lattice is studied assuming a negative scattering length (BCS side of the Feshbach resonance). When the interaction is attractive, fermionic atoms can pair and form a superfluid. The dispersion of the phonon-like mode and the speed of sound in the long-wavelength limit are obtained by solving the Bethe-Salpeter equations for the collective modes of the attractive Hubbard Hamiltonian.

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Cooper-pair-condensate fluctuations and plasmons in layered superconductors

Cited by 77 publications

References 32 publications

Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state

Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state

Laser-induced collective excitations in a two-component Fermi gas

Speed of sound in an optical lattice

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