One and twoatom states in a rotating ring lattice
Abstract
We study the states of one and two atoms in a rotating ring lattice in a Hubbardtype tightbinding model. The model is developed carefully from basic principles in order to properly identify the physical observables. The oneparticle ground state may be degenerate and represent a finite flow velocity depending on the parity of the number of lattice sites, the sign of the tunneling matrix element, and the rotation speed of the lattice. Variation of the rotation speed may be used to control oneatom states and leads to peculiar behaviors such as wildly different phase and group velocities for an atom. Adiabatic variation of the rotation speed of the lattice may also be used to control the state of a twoatom lattice dimer. For instance, at a suitably chosen rotation speed both atoms are confined to the same lattice site.
 Publication:

Physical Review A
 Pub Date:
 March 2012
 DOI:
 10.1103/PhysRevA.85.033637
 arXiv:
 arXiv:1203.0246
 Bibcode:
 2012PhRvA..85c3637J
 Keywords:

 03.75.Lm;
 37.10.Jk;
 05.30.Jp;
 05.50.+q;
 Tunneling Josephson effect BoseEinstein condensates in periodic potentials solitons vortices and topological excitations;
 Atoms in optical lattices;
 Boson systems;
 Lattice theory and statistics;
 Quantum Physics;
 Condensed Matter  Other Condensed Matter;
 Physics  Atomic Physics
 EPrint:
 Very close to the submitted version