Anisotropy induced Feshbach resonances in a quantum dipolar gas of magnetic atoms.
A Petrov, Svetlana A. Kotochigova, Eite Tiesinga
We explore the anisotropic nature of Feshbach resonances in the collision between ultracold magnetic submerged-shell dysprosium atoms, which can only occur due to couplings to rotating bound states. This is in contrast to well-studied alkali-metal atom collisions, where most Feshbach resonances are hyperfine induced and due to rotation-less bound states. Our novel first-principle coupled-channel calculation of the collisions between open 4f-shell spin-polarized bosonic Dy atoms reveals a striking correlation be tween the anisotropy due to magnetic dipole-dipole and electrostatic interactions and the Feshbach spectrum as a function of an external magnetic field. In a 20 mT magnetic field range we predict about a dozen Feshbach resonances and show that the resonance locations are exquisitely sensitive to the dysprosium isotope.
, Kotochigova, S.
and Tiesinga, E.
Anisotropy induced Feshbach resonances in a quantum dipolar gas of magnetic atoms., Physical Review Letters, [online], https://doi.org/10.1103/PhysRevLett.109.103002
(Accessed November 28, 2021)