



01318nas a2200145   4500008004100000245008900041210006900130260001300199490000800212520084800220100002201068700001901090700002601109856003701135       2012                        eng d00aAnisotropy induced Feshbach resonances in a quantum dipolar gas of  magnetic atoms
0 aAnisotropy induced Feshbach resonances in a quantum dipolar gas   c2012/9/70 v1093 a  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 dysprosium reveals a striking correlation
between the anisotropy due to magnetic dipole-dipole and electrostatic
interactions and the Feshbach spectrum as a function of an external magnetic
field. Over 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.
1 aPetrov, Alexander1 aTiesinga, Eite1 aKotochigova, Svetlana  uhttp://arxiv.org/abs/1203.4172v1