title: 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.
authors.affiliation: Physics Department, National Tsing-Hua University, Hsinchu, Taiwan, Republic of China.
authors.forename: Daw-Wei
authors.initials: DW
authors.lastname: Wang