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arXiv 0904.4397cond-mat.quant-gas
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双色超晶格中玻色子的Phase Diagram

Phase Diagram of Bosons in Two-Color Superlattices from Experimental Parameters

Felix Schmitt, Markus Hild, Robert Roth

摘要:

我们研究了玻色87-Rb原子气体在双色超晶格势中的零温相图,直接从实验参数出发,如产生超晶格的两束激光的波长和强度。在第一步中,我们通过显式能带结构计算将实验装置映射到具有站点相关参数的玻色-哈伯德哈密顿量。在第二步中,我们使用密度矩阵重整化群(DMRG)方法求解多体问题,并计算了观测量,如能隙,凝聚分数,最大数起伏和干涉条纹的可见度。我们研究了相图作为函数的激光强度s_2和s_1作为控制参数,并表明,所有相关的量子相,即超流,莫特绝缘体,和准玻色玻璃相,以及它们之间的转变可以通过这些强度的变化单独进行调查。

英文摘要:

We study the zero-temperature phase diagram of a gas of bosonic 87-Rb atoms in two-color superlattice potentials starting directly from the experimental parameters, such as wavelengths and intensities of the two lasers generating the superlattice. In a first step, we map the experimental setup to a Bose-Hubbard Hamiltonian with site-dependent parameters through explicit band-structure calculations. In the second step, we solve the many-body problem using the density-matrix renormalization group (DMRG) approach and compute observables such as energy gap, condensate fraction, maximum number fluctuations and visibility of interference fringes. We study the phase diagram as function of the laser intensities s_2 and s_1 as control parameters and show that all relevant quantum phases, i.e. superfluid, Mott-insulator, and quasi Bose-glass phase, and the transitions between them can be investigated through a variation of these intensities alone.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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