Excitation Spectra and Hard-core Thermodynamics of Bosonic Atoms In Double Well Optical Lattices
arXiv:1405.5435 · doi:10.1103/PhysRevA.91.013617
Abstract
A general coupled representation is proposed for bosonic atoms in double well optical lattices. Based on such a representation, we investigate the excitation spectra and thermodynamics of bosonic atoms in the optical lattices. We find excitation spectra of the double well system with filling factor equal to one can be described by simultaneous excitations composed of pseudo particles corresponding to doubly occupied and empty double wells. It is demonstrated that hard-core bosonic statistics must be taken into account in order to properly describe the equilibrium properties at finite temperatures. For this we calculate the temperature dependence curves of particle numbers and heat capacity, in which the hard-core features are clearly shown. At last, the cases with filling factors unequal to one are also briefly discussed.
10 pages
References in corpus (14)
- Many-Body Physics with Ultracold Gases
- Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
- Bose-Einstein Condensation in Magnetic Insulators
- Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
- Controlled exchange interaction between pairs of neutral atoms in an optical lattice
- A lattice of double wells for manipulating pairs of cold atoms
- Cold Bosons in Optical Lattices
- Preparing and probing atomic number states with an atom interferometer
- Boson Mott insulators at finite temperatures
- Quantum phases of bosons in double-well optical lattices
- Incommensurate superfluidity of bosons in a double-well optical lattice
- Phases of a 2D Bose Gas in an Optical Lattice
- Bond-operators and triplon analysis for spin-S dimer antiferromagnets
- Cold atoms in double-well optical lattices