Vortex lattices of bosons in deep rotating optical lattices

Abstract

We study vortex-lattice phases for a Bose gas trapped in a rotating optical-lattice near the superfluid--Mott-insulator transition. We find a series of abrupt structural phase transitions where vortices are pinned with their cores only on plaquettes or only on sites. We discuss connections between these vortex structures and the Hofstadter-butterfly spectrum of free particles on a rotating lattice.

15 Pages, 5 Figures; Title slightly modified; References updated; Organized into sections; Typos corrected; Some discussion added

References in corpus (5)

• Many-Body Physics with Ultracold Gases
• Pinning of vortices in a Bose-Einstein condensate by an optical lattice
• Vortex configurations of bosons in an optical lattice
• Phase Boundary of the Boson Mott Insulator in a Rotating Optical Lattice
• Pinning and collective modes of a vortex lattice in a Bose-Einstein condensate

Cited by in corpus (2)

• Mott-Insulator Transition for Ultracold Fermions in Two-Dimensional Optical Lattices
• Vortices in rotating optical lattices: commensurability, hysteresis, and proximity to the Mott State