Finite temperature instabilities of 2D dipolar Bose gas at arbitrary tilt angle

Abstract

Advances in creating stable dipolar Bose systems, and ingenious box traps have generated tremendous interest. Theory study of dipolar bosons at finite temperature (T) has been limited. Motivated by these, we study 2D dipolar bosons at arbitrary tilt angle, $\theta$, using finite-T random phase approximation. We show that a comprehensive understanding of phases and instabilities at non-zero T can be obtained on concurrently considering dipole strength, density, temperature and $\theta$. We find the system to be in a homogeneous non-condensed phase that undergoes a collapse transition at large $\theta$, and a finite momentum instability, signaling a striped phase, at large dipolar strength; there are important differences with the T=0 case. At T = 0, BEC appears at critical dipolar strength, and at critical density. Our predictions for polar molecule system, ${}^{41}{K}^{87}Rb$, and ${}^{166}Er$ may provide tests of our results. Our approach may apply broadly to systems with long-range, anisotropic interactions.

References in corpus (13)

• Bose-Einstein Condensation of Erbium
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Transient supersolid properties in an array of dipolar quantum droplets
• Stabilizing a purely dipolar quantum gas against collapse
• Long-lived and transient supersolid behaviors in dipolar quantum gases
• Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions
• Striped states in a many-body system of tilted dipoles
• Spontaneous inhomogeneous phases in ultracold dipolar Fermi gases
• Dipolar Bose Superstripes
• Phase diagram of dipolar bosons in 2D with tilted polarization
• Two-dimensional Bose gas of tilted dipoles: roton instability and condensate depletion
• Berezinskii-Kosterlitz-Thouless Transition in Two-Dimensional Dipolar Stripes

Cited by in corpus (1)

• Tilted dipolar bosons in the quasi-two-dimensional regime: From liquid stripes to droplets