Quantum phase transitions of polar molecules in bilayer systems

Abstract

We investigate the quantum phase transitions of bosonic polar molecules in a two-dimensional double layer system. We show that an interlayer bound state of dipoles (dimers) can be formed when the dipole strength is above a critical value, leading to a zero-energy resonance in the interlayer s-wave scattering channel. In the positive detuning side of the resonance, the strong repulsive interlayer pseudopotential can drive the system into a maximally entangled state, where the wave function is a superposition of two states that have all molecules in one layer and none in the other. We discuss how the zero-energy resonance, dimer states, and the maximally entangled state can be measured in time-of-flight experiments.

Minor corrections

References in corpus (5)

• Observation of dipole-dipole interaction in a degenerate quantum gas
• Interference of an array of independent Bose-Einstein condensates
• Exact hydrodynamics of a trapped dipolar Bose-Einstein condensate
• Quantum fluids of self-assembled chains of polar molecules
• Pseudospin ferromagnetism in double-quantum-wire systems

Cited by in corpus (5)

• Mott-insulator phases of non-locally coupled 1D dipolar Bose gases
• Pseudo-potential of a power-law decaying interaction in two-dimensional systems
• An effective many-body theory for strongly interacting polar molecules
• Structure and melting behavior of classical bilayer crystals of dipoles
• Interaction-induced first order correlation between spatially-separated 1D dipolar fermions