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Q: Fachverband Quantenoptik und Photonik
Q 56: Ultra-cold plasmas and Rydberg systems III (joint session A/Q)
Q 56.3: Vortrag
Freitag, 13. März 2020, 11:45–12:00, b305
Fermi surface deformation and pairing of Rydberg-dressed fermions — •Yijia Zhou1 and Weibin Li1,2 — 1School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK — 2Centre for the Theoretical Physics and Mathematics of Quantum Non-equilibrium Systems, University of Nottingham, Nottingham, NG7 2RD, UK
Anisotropic long-range interactions in cold Fermi gas have attracted broad interest in studying exotic many-body physics. Previous theories and experiments on magnetic dipolar atoms have revealed distorted Fermi surface, directional zero sound, anisotropic Cooper pair and Wigner crystallisation, etc. In this work, we study the laser dressing of fermions to Rydberg p-states and d-states. Due to the higher angular momentum, the Rydberg-dressed interaction is anisotropic and long-ranged. By controlling the strength and length of the interaction, the anisotropicity is enhanced in a controlled fashion. Focusing on a single component fermion gas, we show that the strong anisotropic interaction alters the many-body ground state, such that the Fermi surface is deformed. When two fermions with opposite momentum are paired through the long-range interaction, they exhibit interesting anisotropic features. We study dependences of the anisotropic physics of the fermion gas on the laser parameter, Rydberg state, and density of atoms.