Mott transition in a cavity-boson system: A quantitative comparison between theory and experiment
Mott transition in a cavity-boson system: A quantitative comparison between theory and experiment
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DOI：
10.21468/scipostphys.11.2.030
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发表时间：
2021-04
期刊：
影响因子：
5.5
通讯作者：
R. Lin;Christoph Georges;J. Klinder;P. Molignini;M. Buttner;A. Lode;R. Chitra;A. Hemmerich;H. Keßler
中科院分区：
文献类型：
--
作者：
R. Lin;Christoph Georges;J. Klinder;P. Molignini;M. Buttner;A. Lode;R. Chitra;A. Hemmerich;H. Keßler
空腔-玻色子系统中短程和空腔介导的无限程相互作用之间的竞争导致自组织体系内存在超流体相和莫特绝缘体相。在这项工作中，我们定量比较了实验中测量的这种转变的稳态相边界，并使用不可区分粒子的多构型瞬态 Hartree 方法进行模拟。为了使该问题在计算上可行，我们用二维四势阱的精确多体波函数来表示整个系统。我们认为这种表示的有效性来自空腔原子系统和玻色-哈伯德物理学的本质。此外，我们还表明，所选择的表示法仅引起较小的系统误差，并且实验测量和理论预测的相边界相当吻合。因此，我们展示了一种用于超流体-莫特绝缘体相界物理定量数值模拟的新方法。
The competition between short-range and cavity-mediated infinite-range interactions in a cavity-boson system leads to the existence of a superfluid phase and a Mott-insulator phase within the self-organized regime. In this work, we quantitatively compare the steady-state phase boundaries of this transition measured in experiments and simulated using the Multiconfigurational Time-Dependent Hartree Method for Indistinguishable Particles. To make the problem computationally feasible, we represent the full system by the exact many-body wave function of a two-dimensional four-well potential. We argue that the validity of this representation comes from the nature of both the cavity-atomic system and the Bose-Hubbard physics. Additionally, we show that the chosen representation only induces small systematic errors, and that the experimentally measured and theoretically predicted phase boundaries agree reasonably well. We thus demonstrate a new approach for the quantitative numerical modeling for the physics of the superfluid--Mott-insulator phase boundary.