Special Kadanoff Seminar: Effective field theoretical approach to induced impurity-impurity potential in superfluids - Masaru Hongo, Niigata University

1:30–2:30 pm MCP 201

In this talk, I will introduce our recent work about the long-range behavior of the induced Casimir interaction between two spinless heavy impurities in superfluids. After demonstrating a conventional discussion leading to the Yukawa potential between two impurities, I will explain our approach based on the effective field theory of a Galilean invariant superfluid. I will then show that the impurity-impurity potential at long distance universally shows a relativistic van der Waals-like attraction (∼1/r^7) resulting from the exchange of two superfluid phonons at zero temperature. The sound velocity is shown to control the magnitude of the van der Waals potential, which we evaluate for the fermionic superfluid in the BCS-BEC crossover.

Ref. Keisuke Fujii, Masaru Hongo, Tilman Enss, arXiv:2206.01048 [cond-mat.quant-gas], https://arxiv.org/abs/2206.01048

Event Type

Seminars

Aug 31