Bogoliubov depletion of the fragmented condensate in the bosonic flux ladder

Abstract

We theoretically analyze the ground state of weakly interacting bosons in the flux ladder -- the system that has been recently realized by means of ultacold atoms in the specially designed optical lattice [M. Atala, et al., Nat. Phys. 10, 588 (2014)]. It is argued that, for the system parameters corresponding to the so-called `vortex phase', the ground state is a fragmented condensate. We study the Bogoliubov depletion of this condensate and discuss the role of boundary conditions.

7 figures

References in corpus (9)

• Fragmentation of Bose-Einstein Condensates
• General variational many-body theory with complete self-consistency for trapped bosonic systems
• Vortex and Meissner phases of strongly-interacting bosons on a two-leg ladder
• Fragmented many-body ground states for scalar bosons in a single trap
• Theory of Bosons in two-leg ladders with large magnetic fields
• Condensate fragmentation as a sensitive measure of the quantum many-body behavior of bosons with long-range interactions
• Condensed Groundstates of Frustrated Bose-Hubbard Models
• Semiclassical quantization of the Bogoliubov spectrum
• Revealing single-trap condensate fragmentation by measuring density-density correlations after time of flight

Cited by in corpus (8)

• Fragmentation and correlations in a rotating Bose-Einstein condensate undergoing breakup
• Robust and Ultrafast State Preparation by Ramping Artificial Gauge Potentials
• Condensates Breaking Up Under Rotation
• Assessing small accelerations using a bosonic Josephson junction
• Interference of longitudinal and transversal fragmentations in the Josephson tunneling dynamics of Bose-Einstein condensates
• Fragmentation of a trapped bosonic mixture
• Fragmentation of a trapped multiple-species bosonic mixture
• Fragmentation of identical and distinguishable bosons' pairs and natural geminals of a trapped bosonic mixture