Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-09-27
Phys. Rev. A 83, 031605(R) (2011)
Physics
Condensed Matter
Quantum Gases
4 pages
Scientific paper
10.1103/PhysRevA.83.031605
We perform large-scale Quantum Monte Carlo (QMC) simulations for strongly interacting bosons in a 2D optical lattice trap, and confirm an excellent agreement with the benchmarking in-situ density measurements by the Chicago group [1]. We further present a general finite temperature phase diagram both for the uniform and the trapped systems, and demonstrate how the universal scaling properties near the superfluid(SF)-to-Mott insulator(MI) transition can be observed by analysing the in-situ density profile. The characteristic temperature to find such quantum criticality is estimated to be of the order of the single-particle bandwidth, which should be achievable in the present or near future experiments. Finally, we examine the validity regime of the local fluctuation-dissipation theorem (FDT), which can be a used as a thermometry in the strongly interacting regime.
Chen Pochung
Chung Chia-Ming
Fang Shiang
Ma Ping Nang
Wang Daw-Wei
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