Striped Ultradilute Liquid of Dipolar Bosons in Two Dimensions

Abstract

We investigate the phases of a Bose-Einstein condensate of dipolar atoms restricted to move in a two-dimensional plane. The dipole moments are all aligned in a direction tilted with respect to the plane normal. As a result of the attractive and repulsive components of the dipole-dipole interaction, the dipolar gas has a self-bound phase, which is stabilized by quantum fluctuations. Furthermore, tilting the dipoles tunes the anisotropy of the dipole-dipole interaction, which can trigger a spatial density modulation. In this work we study these two aspects and investigate the conditions for the formation of a self-bound and striped phase, which has been realized in experiments with dipolar droplets. We use a variational method based on the hypernetted-chain Euler-Lagrange optimization of a Jastrow-Feenberg ansatz for the many-body wave function to study the ground state properties. This method takes into account quantum fluctuations in a non-perturbative way and thus can be used also for strongly correlated systems.

9 pages, 9 figures

References in corpus (19)

• Quantum liquid droplets in a mixture of Bose-Einstein condensates
• 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
• Supersolid formation in a quantum gas breaking continuous translational symmetry
• Transient supersolid properties in an array of dipolar quantum droplets
• Long-lived and transient supersolid behaviors in dipolar quantum gases
• Dipolar physics: A review of experiments with magnetic quantum gases
• Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions
• Supersolidity around a critical point in dipolar Bose Einstein condensates
• Droplets of trapped quantum dipolar bosons
• Liquid quantum droplets of ultracold magnetic atoms
• Roton Excitations in an Oblate Dipolar Quantum Gas
• Density Fluctuations across the Superfluid-Supersolid Phase Transition in a Dipolar Quantum Gas
• Dipolar Bose Superstripes
• Feshbach Resonances in an Erbium-Dysprosium Dipolar Mixture
• Onset of a modulational instability in trapped dipolar Bose-Einstein condensates
• Phase diagram of dipolar bosons in 2D with tilted polarization
• Low-energy potential scattering in two and three dimensions
• The Multi-component Correlated Basis Function Method and its Application to Multilayered Dipolar Bose Gases

Cited by in corpus (5)

• Supersolidity in ultra-cold dipolar gases
• Realizing multiband states with ultracold dipolar quantum simulators
• Universal properties of dipolar Bose polarons in two dimensions
• Tilted dipolar bosons in the quasi-two-dimensional regime: From liquid stripes to droplets
• Excitations and anisotropic sound in planar dipolar supersolids with tilted dipoles