f-wave superfluidity from repulsive interaction in Rydberg-dressed Fermi gas


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Keles A. , Zhao E., Li X.

PHYSICAL REVIEW A, cilt.101, 2020 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

Interacting Fermi gas provides an ideal model system to understand unconventional pairing and intertwined orders relevant to a large class of quantum materials. Rydberg-dressed Fermi gas is a recent experimental system where the sign, strength, and range of the interaction can be controlled. The interaction in momentum space has a negative minimum at q(c) inversely proportional to the characteristic length scale in real space, the soft-core radius r(c). We show theoretically that single-component (spinless) Rydberg-dressed Fermi gas in two dimensions has a rich phase diagram with superfluid and density wave orders due to the interplay of the Fermi momentum p(F), interaction range r(c), and interaction strength u(0). For repulsive bare interactions u(0) > 0, the dominant instability is a f-wave superfluid for p(F) r(c) less than or similar to 2 and a densitywave for p(F) (r)c greater than or similar to 4. The f-wave pairing in this repulsive Fermi gas is reminiscent of the conventional Kohn-Luttinger mechanism but has a much higher T-c. For attractive bare interactions u(0) < 0, the leading instability is p-wave pairing. The phase diagram is obtained from a functional renormalization group that treats all competing many-body instabilities in the particle-particle and particle-hole channels on an equal footing.