The Cooper pair from radio-frequency excitations in ultracold gases

TL;DR

This paper explores the nature of Cooper pairs in ultracold gases, linking radio-frequency excitation thresholds to pair size and distinguishing between bosonic and fermionic pairs based on experimental and theoretical insights.

Contribution

It provides a new perspective on Cooper pair formation in ultracold gases by connecting excitation thresholds to pair size and clarifying the physical differences between bosonic and fermionic pairs.

Findings

Threshold energy determines Cooper pair size.

Exact solutions of reduced BCS problem inform pair characteristics.

Distinction between bosonic and fermionic Cooper pairs clarified.

Abstract

We discuss the concept of Cooper pair in the context of recent experimental studies of radio-frequency excitations in ultracold atomic gases. We argue that the threshold energy determines the size of the Cooper pair emergent from the exact solution of the reduced BCS problem, and elaborate on the physical distinction between bosonic and fermionic Cooper pairs.