Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session S00: Poster Session III (4pm-6pm CDT)
4:00 PM,
Thursday, June 6, 2024
Room: Hall BC
Abstract: S00.00093 : Fermi liquid properties of ultra-cold Rydberg-dressed gases*
Presenter:
B. Tanatar
(Bilkent University)
Authors:
B. Tanatar
(Bilkent University)
I. Seydi
(Institute for Advanced Studies in Basic Sciences (IASBS))
Saeed H Abedinpour
(Institute for Advanced Studies in Basic Sciences (IASBS))
R. Asgari
(Institute for Research in Fundamental Sciences (IPM))
system of Rydberg-dressed ultra-cold fermions within the G0W approximation. We use the static structure factor data from the Fermi-hypernetted-chain approximation to calculate
the screened interaction (i.e., the many-body local field factors), and then the Kukkonene-Overhauser effective interaction. At strong interaction strengths and intermediate
soft-core radius, we observe deeps and jumps in the real and imaginary parts of the self-energy, respectively. This behavior is related to the inelastic scattering of quasiparticles from the collective density modes. The quasiparticle lifetime diverges at the Fermi surface, and its wave-vector dependence deviates from the standard Landau Fermi liquid’s prediction,
i.e., |k−k_F |^{−2} for large soft-core radius and strong interactions, where the homogeneous system is close to the density-wave instability, i.e., droplet crystallization.
In the homogeneous liquid phase, the renormalization constant is suppressed by increasing either the interaction strength or soft-core radius. The many-body effective
mass is also reduced compared to its non-interacting values but its dependence on the coupling strength and soft-core radius is not monotonic. Signatures of approaching
the droplet crystal phase are observed in both the renormalization constant and effective mass. In the single-particle spectral function, two additional heavy modes emerge
at strong couplings. These composite excitations are undamped at small wave vectors. Due to the repulsion between the quasiparticle and composite excitations, we observe a
gap-like feature between the quasiparticle and composite excitation bands. The dispersions of composite modes merge at large wave vectors but remain well separated from the
single-particle excitation.
*Supported by the Turkish Academy of Sciences (TUBA).
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