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Dark Continuum in the Spectral Function of the Resonant Fermi Poltroon

TYPESpecial Seminar - Solid State Institute, Technion
Speaker:Dr. Olga Goulko
Affiliation:Department of Physics, University of Massachusetts, Amherst, U.S.A.
Time:14:30 - 15:30
Location:Solid State Auditorium(Entrance)
Remark:Host: Assistant Professor Yoav Sagi
Abstract:I will present controlled numerical results for the ground state spectral function of the resonant Fermi polaron in three dimensions and discuss the existence of a "dark continuum" -- a region of anomalously low spectral weight between the narrow polaron peak and the broad spectral continuum maximum at positive energy. Surprisingly, the dark continuum develops when the s-wave scattering length is of the order of the inverse Fermi wavevector, i.e. in the absence of a small interaction-related parameter.