Speaker
Prof.
Tilman Enss
Description
We investigate the induced Casimir interaction between two impurities in superfluid atomic gases. With the help of effective field theory (EFT) for a Galilean invariant superfluid, we find that the induced impurity-impurity potential at long distance does not fall off exponentially as a Yukawa potential, but instead exhibits a universal power-law scaling. We show that the exchange of two phonons leads to a relativistic van der Waals-like attraction (∼1/r^7) at zero temperature and a nonrelativistic van der Waals attraction (∼T/r^6) at finite temperature.
Primary author
Prof.
Tilman Enss
