# Ferroelectric quantum phase transition with cold polar molecules

@article{Klinsmann2014FerroelectricQP, title={Ferroelectric quantum phase transition with cold polar molecules}, author={Markus Klinsmann and David Peter and Hans Peter Buchler}, journal={arXiv: Quantum Gases}, year={2014} }

We analyze a system of polar molecules in a one-dimensional optical lattice. By controlling the internal structure of the polar molecules with static electric and microwave fields, we demonstrate the appearance of a quantum phase transition into a ferroelectric phase via spontaneous breaking of a $U(1)$ symmetry. The phase diagram is first analyzed within mean-field theory, while in a second step the results are verified by a mapping onto the Bose-Hubbard model for hard-core bosons. The latter…

## 2 Citations

A Graphene-Edge Ferroelectric Molecular Switch.

- Medicine, Materials ScienceNano letters
- 2018

We show that polar molecules (water, ammonia, and nitrogen dioxide) adsorbed solely at the exposed edges of an encapsulated graphene sheet exhibit ferroelectricity, collectively orienting and…

Quantum states with topological properties via dipolar interactions

- Physics
- 2015

This thesis proposes conceptually new ways to realize materials with topological properties by using dipole-dipole interactions. First, we study a system of ultracold dipolar fermions, where the…

## References

SHOWING 1-10 OF 27 REFERENCES

Interaction-induced ferroelectricity in the rotational states of polar molecules

- Physics
- 2010

We show that a ferroelectric quantum phase transition can be driven by the dipolar interaction of polar molecules in the presence a microwave field. The obtained ferroelectricity crucially depends on…

Quantum phases of cold polar molecules in 2D optical lattices.

- Physics, MedicinePhysical review letters
- 2010

The quantum phases of hard-core bosonic polar molecules on a two-dimensional square lattice interacting via repulsive dipole-dipole interactions are studied, establishing the existence of extended regions of parameters where the ground state is a supersolid.

Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential.

- Physics, MedicinePhysical review letters
- 2007

We discuss techniques to tune and shape the long-range part of the interaction potentials in quantum gases of bosonic polar molecules by dressing rotational excitations with static and microwave…

Hidden order in 1D bose insulators.

- Physics, MedicinePhysical review letters
- 2006

A mean field theory is developed that describes the low-energy excitations in all three insulating phases and predicts a sharp resonance in the spectrum due to a collective excitation of the new phase that would provide clear evidence for the existence of this phase.

Polar Molecules with Three-Body Interactions on the Honeycomb Lattice

- Physics
- 2010

We study the phase diagram of ultra-cold bosonic polar molecules loaded on a two-dimensional optical lattice of hexagonal symmetry controlled by external electric and microwave fields. Following a…

Nonequilibrium quantum magnetism in a dipolar lattice gas.

- Physics, MedicinePhysical review letters
- 2013

The realization of quantum magnetism using a degenerate dipolar gas in an optical lattice characterized by a nonequilibrium spinor dynamics resulting from intersite Heisenberg-like spin-spin interactions provided by nonlocal dipole-dipole interactions is reported.

Spin-orbital dynamics in a system of polar molecules.

- Physics, MedicineNature communications
- 2014

It is shown that dipole-dipole interactions can produce an effective spin-orbit coupling in two-dimensional ultracold polar molecule gases and generates chiral excitations that resemble low-energy quasiparticles in bilayer graphene and emerge regardless of the quantum statistics and for arbitrary ratios of kinetic to interaction energies.

Two-stage melting in systems of strongly interacting Rydberg atoms.

- Physics, MedicinePhysical review letters
- 2010

P perturbation theory and a mapping onto an effective low-energy Hamiltonian are used to find a transition of commensurate solid structures of Rydberg excitations into a floating solid with algebraic correlations.

Quantum magnetism with polar alkali-metal dimers

- Physics
- 2011

We show that dipolar interactions between ultracold polar alkali-metal dimers in optical lattices can be used to realize a highly tunable generalization of the t-J model, which we refer to as the t-J…

The physics of dipolar bosonic quantum gases

- Physics
- 2009

This paper reviews the recent theoretical and experimental advances in the study of ultra-cold gases made of bosonic particles interacting via the long-range, anisotropic dipole–dipole interaction,…