Superfluidity of flexible chains of polar molecules

Abstract

We study properties of quantum chains in a gas of polar bosonic molecules confined in a stack of N identical one- and two- dimensional optical lattice layers, with molecular dipole moments aligned perpendicularly to the layers. Quantum Monte Carlo simulations of a single chain (formed by a single molecule on each layer) reveal its quantum roughening transition. The case of finite in-layer density of molecules is studied within the framework of the J-current model approximation, and it is found that N-independent molecular superfluid phase can undergo a quantum phase transition to a rough chain superfluid. A theorem is proven that no superfluidity of chains with length shorter than N is possible. The scheme for detecting chain formation is proposed.

Submitted to Proceedings of the QFS2010 satellite conference "Cold Gases meet Many-Body Theory", Grenoble, August 7, 2010. This is the expanded version of V.1

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• Synthetic dimensions in ultracold molecules: quantum strings and membranes
• Bound states of Dipolar Bosons in One-dimensional Systems
• Equilibrium Phases of Tilted Dipolar Lattice Bosons
• Quantum Phases of Dipolar Bosons in Bilayer Geometry
• Analytic solutions of topologically disjoint systems
• Strings of ultracold molecules in a synthetic dimension
• Layers of Cold Dipolar Molecules in the Harmonic Approximation
• Borromean supercounterfluidity
• Parafermion excitations in superfluid of quasi-molecular chains
• Quantum few-body bound states of dipolar particles in a helical geometry
• Dipoles on a Two-leg Ladder
• Thermodynamics of Dipolar Chain Systems
• Many-Body Formation and Dissociation of a Dipolar Chain Crystal
• Vortex generation in a superfluid gas of dipolar chains in crossed electric and magnetic fields
• Multi-discontinuity algorithm for world-line Monte Carlo simulations
• Clusters in Separated Tubes of Tilted Dipoles
• Drag-induced dynamical formation of dark solitons in Bose mixture on a ring
• Quantum phases of hard-core dipolar bosons in coupled 1D optical lattices