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arXiv 1108.3013cond-mat.quant-gasquant-ph
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光晶格中玻色子的多轨道和密度诱导隧穿

Multi-orbital and density-induced tunneling of bosons in optical lattices

D. -S. Lühmann, O. Jürgensen, K. Sengstock

摘要:

研究表明,多轨道效应和密度诱导隧穿效应对光晶格中玻色原子的相图有重要影响。离位相互作用导致密度诱导的跳跃,即所谓的键-电荷相互作用,其可以用有效隧穿势来识别,并且可以达到与常规隧穿相同的数量级。此外,相互作用引起的高带过程也引起强烈修改的隧道,现场和键电荷相互作用。我们导出了一个具有多轨道重整化过程的扩展的占据相关哈伯德模型,并计算了相应的相图。它大大偏离了单带玻色-哈伯德模型,并预言了超流到莫特绝缘体转变的强烈变化。在一般情况下,提出的超越哈伯德物理在玻色子晶格系统中起着至关重要的作用,并具有可调相互作用的实验观察到的影响。

英文摘要:

We show that multi-orbital and density-induced tunneling have a significant impact on the phase diagram of bosonic atoms in optical lattices. Off-site interactions lead to density-induced hopping, the so-called bond-charge interactions, which can be identified with an effective tunneling potential and can reach the same order of magnitude as conventional tunneling. In addition, interaction-induced higher-band processes also give rise to strongly modified tunneling, on-site and bond-charge interactions. We derive an extended occupation-dependent Hubbard model with multi-orbitally renormalized processes and compute the corresponding phase diagram. It substantially deviates from the single-band Bose-Hubbard model and predicts strong changes of the superfluid to Mott-insulator transition. In general, the presented beyond-Hubbard physics plays an essential role in bosonic lattice systems and has an observable influence on experiments with tunable interactions.

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