Resonances in non-universal dipolar collisions

TL;DR

This paper presents a theoretical study of scattering resonances in ultracold dipolar molecules, introducing a coupled-channel calculation method to analyze how resonances depend on short-range loss probabilities, with implications for experimental control.

Contribution

It develops an efficient coupled-channel calculation method to impose multiple short-range boundary conditions in ultracold dipolar collision models, advancing understanding of resonance behavior.

Findings

Resonances are sensitive to the short-range loss probability.

Lowering loss probability below unity affects resonance appearance.

Potential realization in nonreactive molecules in blue-detuned traps.

Abstract

Scattering resonances due to the dipole-dipole interaction between ultracold molecules, induced by static or microwave fields, are studied theoretically. We develop a method for coupled-channel calculations that can efficiently impose many short-range boundary conditions, defined by a short-range phase shift and loss probability as in quantum-defect theory. We study how resonances appear as the short-range loss probability is lowered below the universal unit probability. This may become realizable for nonreactive ultracold molecules in blue-detuned box potentials.