AQP Seminar: Induced p-wave superfluidity in ultracold atom gases

Aalto Quantum Physics seminaari (Nanotalo). Puhuja: Dr. Jami Kinnunen (QD group)

Fermionic superfluidity arising from interactions induced by excitations in a surrounding bath is the basic paradigm in our description of superconductivity. In contrast, superfluidity in ultracold atom gases is driven by direct attractive two-body interactions. While beneficial for realizing the superfluid state in ultracold gases, it limits the scope at which atomic gases can be used for simulating various exotic superconducting states in solid state systems.

In this talk, I will present our theory for the induced p-wave pairing in a spin-polarized Fermi gas immersed in a Bose-Einstein condensate. Fermions interact via the exchange of phonons in the condensate, and our self-consistent theory takes into account the full frequency and momentum dependence of the resulting induced interaction.

Our work has the focus on the prospects of experimentally realizing the induced p-wave superfluid state. The results show that such a superfluid indeed is experimentally within reach using light bosons mixed with heavy fermions. In the talk, I will provide a simple and intuitive picture why this is the case.

J.J. Kinnunen, Z. Wu, and G. M. Bruun, Phys. Rev. Lett. 121, 253402 (2018). https://doi.org/10.1103/PhysRevLett.121.253402