Superexchange Liquefaction of Strongly Correlated Lattice Dipolar Bosons

Abstract

We propose a mechanism for liquid formation in strongly correlated lattice systems. The mechanism is based on an interplay between long-range attraction and superexchange processes. As an example, we study dipolar bosons in one-dimensional optical lattices. We present a perturbative theory and validate it in comparison with full density-matrix renormalization group simulations for the energetic and structural properties of different phases of the system, i.e., self-bound Mott insulator, liquid, and gas. We analyze the nonequilibrium properties and calculate the dynamic structure factor. Its structure differs in compressible and insulating phases. In particular, the low-energy excitations in compressible phases are linear phonons. We extract the speed of sound and analyze its dependence on dipolar interaction and density. We show that it exhibits a nontrivial behaviour owing to the breaking of Galilean invariance. We argue that an experimental detection of this previously unknown quantum liquid could provide a fingerprint of the superexchange process and open intriguing possibilities for investigating non-Galilean invariant liquids.

7+7 pages, 7+7 figures; extended authors' version before word limit cuts for the PRL

References in corpus (13)

• Many-Body Physics with Individually-Controlled Rydberg Atoms
• Quantum liquid droplets in a mixture of Bose-Einstein condensates
• Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
• Self-bound droplets of a dilute magnetic quantum liquid
• Quantum-fluctuation-driven crossover from a dilute Bose-Einstein condensate to a macro-droplet in a dipolar quantum fluid
• Bosonizing one-dimensional cold atomic gases
• Spectral functions in one-dimensional quantum systems at T>0
• Dynamical density-density correlations in the one-dimensional Bose gas
• Exact edge singularities and dynamical correlations in spin-1/2 chains
• Measuring the dynamic structure factor of a quantum gas undergoing a structural phase transition
• Quantum liquid of repulsively bound pairs of particles in a lattice
• Characterization of Mott-insulating and superfluid phases in the one-dimensional Bose--Hubbard model
• Are the Tonks regimes in the continuum and on the lattice truly equivalent?

Cited by in corpus (7)

• Recent progress on quantum simulations of non-standard Bose-Hubbard models
• Transversal effects on the ground-state of hard-core dipolar bosons in one-dimensional optical lattices
• Realizing multiband states with ultracold dipolar quantum simulators
• Interaction quench of dipolar bosons in a one-dimensional optical lattice
• Super-Tonks-Girardeau Quench in the Extended Bose-Hubbard Model
• Phase diagram and elementary excitations of strongly interacting droplets with non-local interactions
• Dimensional crossover of bound complexes in a two-species Bose-Hubbard lattice: Correlations and dynamics