Structure and melting behavior of classical bilayer crystals of dipoles
arXiv:0806.2203 · doi:10.1103/PhysRevB.78.024108
Abstract
We study the structure and melting of a classical bilayer system of dipoles, in a setup where the dipoles are oriented perpendicular to the planes of the layers and the density of dipoles is the same in each layer. Due to the anisotropic character of the dipole-dipole interactions, we find that the ground-state configuration is given by two hexagonal crystals positioned on top of each other, independent of the interlayer spacing and dipolar density. For large interlayer distances these crystals are independent, while in the opposite limit of small interlayer distances the system behaves as a two-dimensional crystal of paired dipoles. Within the harmonic approximation for the phonon excitations, the melting temperature of these crystalline configurations displays a non-monotonic dependence on the interlayer distance, which is associated with a re-entrant melting behavior in the form of solid-liquid-solid-liquid transitions at fixed temperature.
15 pages, 13 figures
References in corpus (16)
- Observation of dipole-dipole interaction in a degenerate quantum gas
- Stabilizing a purely dipolar quantum gas against collapse
- Hidden order in 1D Bose insulators
- Magneto-electrostatic trapping of ground state OH molecules
- Magnetic trapping and Zeeman relaxation of imidogen (NH X-triplet-Sigma)
- Cold Atoms and Molecules in Self-Assembled Dipolar Lattices
- Controlling collisions of ultracold atoms with dc electric fields
- Continuous loading of an electrostatic trap for polar molecules
- Evidence of Luttinger liquid behavior in one-dimensional dipolar quantum gases
- Optical pumping of trapped neutral molecules by blackbody radiation
- Crystalline phase of strongly interacting Fermi mixtures
- Quantum phase transitions of polar molecules in bilayer systems
- Quantum melting of a crystal of dipolar bosons
- Dipolar bosons in a planar array of one-dimensional tubes
- Quantum Computation with Diatomic Bits in Optical Lattices
- Collective excitations of trapped one-dimensional dipolar quantum gases