Pauli Blocking Effect on Efimov States Near Feshbach Resonance

TL;DR

This paper investigates how Pauli blocking influences Efimov states in a quantum Fermi gas, revealing modifications to the Efimov potential and spectrum, and demonstrating the robustness of the universal flow against particle-hole fluctuations.

Contribution

It introduces a detailed analysis of Pauli blocking effects on Efimov states near Feshbach resonances, highlighting alterations to the universal spectrum and potential.

Findings

Efimov potential is altered at large distances due to Pauli blocking

Universal spectrum flow of Efimov trimers is obtained as Fermi density varies

Universal flow remains robust against particle-hole fluctuations

Abstract

In this Letter we study the effect of Pauli blocking on the Efimov states in a quantum Fermi gas and illustrate that the universal Efimov potential is altered at large distances. We obtain the universal spectrum flow of Efimov trimers when the Fermi density is varied and further consider the effect of scattering of trimers by the Fermi sea. We argue that the universal flow is robust against fluctuating particle-hole pairs that result in an infrared catastrophe in impurity problems.