Interaction induced ferro-electricity in the rotational states of polar molecules

Abstract

We show that a ferro-electric quantum phase transition can be driven by the dipolar interaction of polar molecules in the presence a micro-wave field. The obtained ferro-electricity crucially depends on the harmonic confinement potential, and the resulting dipole moment persists even when the external field is turned off adiabatically. The transition is shown to be second order for fermions and for bosons of a smaller permanent dipole moment, but is first order for bosons of a larger moment. Our results suggest the possibility of manipulating the microscopic rotational state of polar molecules by tuning the trap's aspect ratio (and other mesoscopic parameters), even though the later's energy scale is smaller than the former's by six orders of magnitude.

4 pages and 4 figures

References in corpus (14)

• A High Phase-Space-Density Gas of Polar Molecules
• The physics of dipolar bosonic quantum gases
• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Cold polar molecules in 2D traps: Tailoring interactions with external fields for novel quantum phases
• Quantum fluids of self-assembled chains of polar molecules
• Spontaneous spin textures in dipolar spinor condensates
• Phase space deformation of a trapped dipolar Fermi gas
• Molecular Dipolar Crystals as High Fidelity Quantum Memory for Hybrid Quantum Computing
• Spontaneous Circulation in Ground-State Spinor Dipolar Bose-Einstein Condensates
• Biaxial nematic phases in ultracold dipolar Fermi gases
• Mott-insulator phases of non-locally coupled 1D dipolar Bose gases
• Dipolar bosons in a planar array of one-dimensional tubes
• An effective many-body theory for strongly interacting polar molecules
• Ultracold heteronuclear molecules and ferroelectric superfluids

Cited by in corpus (18)

• Quantum control of molecular rotation
• Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules
• Quantum Magnetism with Polar Alkali Dimers
• Kitaev honeycomb and other exotic spin models with polar molecules
• BCS-BEC Crossover in Bilayers of Cold Fermionic Polar Molecules
• Supersolid Phase of Cold Fermionic Polar Molecules in 2D Optical Lattices
• d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules
• Thermodynamics and coherence of a trapped dipolar Fermi gas
• Collective phenomena in quasi-two-dimensional fermionic polar molecules: band renormalization and excitons
• Field-induced long-lived supermolecules
• Magnetostriction and exchange effects in trapped dipolar Bose and Fermi gases
• Dynamical properties of a trapped dipolar Fermi gas at finite temperature
• Controllable quantum spin glasses with magnetic impurities embedded in quantum solids
• Quantum rotor model for a Bose-Einstein condensate of dipolar molecules
• Antiferromagnetism and superfluidity of a dipolar Fermi gas in a 2D optical lattice
• Stability of a trapped dipolar quantum gas
• Spinor Bose-Einstein Condensates of Rotating Polar Molecules
• Ferroelectric quantum phase transition with cold polar molecules