The nature of Feshbach molecules in Bose-Einstein condensates

TL;DR

This paper explores the properties and production of Feshbach molecules in Bose-Einstein condensates, emphasizing their long-range nature and the importance of full two-body physics for understanding and probing these molecular condensates.

Contribution

It provides a comprehensive many-body analysis incorporating full binary physics, advancing understanding of Feshbach molecules in BECs beyond previous models.

Findings

Long-range nature of Feshbach molecules enhances production efficiency

Full two-body Hamiltonian is essential for accurate description

Proper probing methods for molecular condensates are identified

Abstract

We discuss the long range nature of the molecules produced in recent experiments on molecular Bose-Einstein condensation. The properties of these molecules depend on the full two-body Hamiltonian and not just on the states of the system in the absence of interchannel couplings. The very long range nature of the state is crucial to the efficiency of production in the experiments. Our many-body treatment of the gas accounts for the full binary physics and describes properly how these molecular condensates can be directly probed.