Excitations and Stripe Phase Formation in a 2D Dipolar Bose Gas with Tilted Polarization
arXiv:1209.1453 · doi:10.1103/PhysRevLett.109.235307
Abstract
We present calculations of the ground state and excitations of an anisotropic dipolar Bose gas in two dimensions, realized by a non-perpendicular polarization with respect to the system plane. For sufficiently high density an increase of the polarization angle leads to a density instability of the gas phase in the direction where the anisotropic interaction is strongest. Using a dynamic many-body theory, we calculate the dynamic structure function in the gas phase which shows the anisotropic dispersion of the excitations. We find that the energy of roton excitations in the strongly interacting direction decreases with increasing polarization angle and almost vanishes close to the instability. Exact path integral ground state Monte Carlo simulations show that this instability is indeed a quantum phase transition to a stripe phase, characterized by long-range order in the strongly interacting direction.
5 pages, 4 figures
References in corpus (6)
- Bose-Einstein Condensation of Erbium
- Condensed Matter Theory of Dipolar Quantum Gases
- Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
- Quantum phase transition in a two-dimensional system of dipoles
- Spontaneous inhomogeneous phases in ultracold dipolar Fermi gases
- Liquid and crystal phase of dipolar fermions in two dimensions
Cited by in corpus (52)
- Observation of a dipolar quantum gas with metastable supersolid properties
- Dipolar physics: A review of experiments with magnetic quantum gases
- Excitation spectrum of a trapped dipolar supersolid and its experimental evidence
- Droplets of trapped quantum dipolar bosons
- Dipolar Bose Superstripes
- Vortices and vortex lattices in quantum ferrofluids
- Fingering instabilities and pattern formation in a two-component dipolar Bose-Einstein condensate
- Phase diagram of dipolar bosons in 2D with tilted polarization
- Supersolid stripe crystal from finite-range interactions on a lattice
- Path integral Monte Carlo ground state approach: Formalism, implementation, and applications
- Controlling the ac Stark effect of RbCs with dc electric and magnetic fields
- Equilibrium Phases of Tilted Dipolar Lattice Bosons
- Ground-state and dynamical properties of two-dimensional dipolar Fermi liquids
- Two-dimensional Bose gas of tilted dipoles: roton instability and condensate depletion
- Berezinskii-Kosterlitz-Thouless Transition in Two-Dimensional Dipolar Stripes
- Competing quantum phases of hard-core boson with tilted dipole-dipole interaction
- Complexes formed in collisions between ultracold alkali-metal diatomic molecules and atoms
- Magic Conditions for Multiple Rotational States of Bialkali Molecules in Optical Lattices
- Dipolar condensates with tilted dipoles in a pancake-shaped confinement
- Coherent Manipulation of the Internal State of Ultracold RbCs Molecules with Multiple Microwave Fields
- Superfluid 4He dynamics beyond quasiparticle excitations
- Higher-order effective interactions for bosons near a two-body zero crossing
- Toroidal Dipolar Supersolid with a Rotating Weak Link
- Stability and excitations of a bilayer of strongly correlated dipolar Bosons
- Quantum phases of dipolar rotors on two-dimensional lattices
- Quantum Monte Carlo estimation of complex-time correlations for the study of the ground-state dynamic structure function
- Exotic roton excitations in quadrupolar Bose-Einstein condensates
- Long-range transverse Ising model built with dipolar condensates in two-well arrays
- Dipolar Bilayer with Antiparallel Polarization -- a Self-Bound Liquid
- Gapped spectrum in pair-superfluid bosons
- Number Fluctuations of a Dipolar Condensate: Anisotropy and Slow Approach to the Thermodynamic Regime
- Ground states of 2D tilted dipolar bosons with density-induced hopping
- Dipoles on a Two-leg Ladder
- Dynamics of ultracold dipolar particles in a confined geometry and tilted fields
- Striped Ultradilute Liquid of Dipolar Bosons in Two Dimensions
- Stripe and checkerboard patterns in a stack of driven quasi-one-dimensional dipolar condensates
- Exploring the Berezinskii-Kosterlitz-Thouless Transition in a Two-dimensional Dipolar Bose Gas
- Interaction potential for NaCs for ultracold scattering and spectroscopy
- The Multi-component Correlated Basis Function Method and its Application to Multilayered Dipolar Bose Gases
- Near-threshold bound states of the dipole-dipole interaction
- Density-wave-type supersolid of two-dimensional tilted dipolar bosons
- Dynamic many-body theory: Dynamic structure factor of two-dimensional liquid He
- Optimized correlations inspired by perturbation theory
- Pseudopotentials for an ultracold dipolar gas
- Classical crystal formation of dipoles in two dimensions
- Composite quasiparticles in strongly-correlated dipolar Fermi liquids
- Universal Properties of Anisotropic Dipolar Bosons in Two Dimensions
- Tilted dipolar bosons in the quasi-two-dimensional regime: From liquid stripes to droplets
- Self-localization of magnons and magnetoroton in a binary Bose-Einstein condensate
- Ground and excited states of coupled exciton liquids in electron-hole quadrilayers
- Molecule-molecule and atom-molecule collisions with ultracold RbCs molecules
- Excitations and anisotropic sound in planar dipolar supersolids with tilted dipoles