Condensed Matter Physics Seminar
Rotation of Degenerate Atoms in Lattices
UConn Physics Department
In this talk, I will present our results on the rotation of atoms in lattices. It is found that, in two dimensional lattices, the fermions can be contained within a harmonic trap even when the rotation frequency is larger than the trapping frequency. This is impossible for atoms in continuum with a harmonic trap. We further studied the rotation of atoms in one dimensional lattice ring. Some analytic expressions were obtained for single atoms in the rings. We showed that while the interaction and filling factor of fermions have important effects on the level crossings, Fermi pressure may make the ground state absence of the fast mode (the fast mode is the state for the atoms in the ground state to move faster than the rotation frequency of the lattice). We also note that the fast mode is due to the finite number of lattices in the ring, and not directly associated with the quantum statistics. These results are very different from the behavior in continuum because lattices break the rotational symmetry.
Thursday, November 30, 2006
Gant Science Complex
(The seminar is followed by coffee/tea, cookies, and an informal discussions.)