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arXiv 2006.13862cond-mat.quant-gas
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具有合成维数的相互作用玻色通量阶梯:基态相和量子猝灭动力学

Interacting bosonic flux ladders with a synthetic dimension: Ground-state phases and quantum quench dynamics

Maximilian Buser, Claudius Hubig, Ulrich Schollwöck, Leticia Tarruell, Fabian Heidrich-Meisner

摘要:

磁通阶梯构成了最小的设置,使系统的理解丰富的物理相互作用的粒子同时受到强磁场和晶格势。本文利用密度矩阵重整化群方法,绘制了磁通阶梯模型的基态相图。重点放在参数,可以通过实验实现利用钾原子的内部状态作为一个合成的维度。重点是可观察到的,如手征电流和腿人口的不平衡。考虑到粒子填充量为每级1个玻色子,我们报道了超流体和莫特绝缘体上存在莫特绝缘迈斯纳相和偏置梯形相。此外,我们表明,从适当选择的初始状态的量子猝灭可以用来探测瞬态动力学中的平衡性质。具体地说,我们考虑了在不同的初始粒子分布情况下,合成流梯模型中沿梯级或腿的跳跃矩阵元的瞬时开启。我们表明,可以观察到的瞬态动力学的偏置梯形相位的清晰的签名。此外,手征电流的行为在瞬态动力学进行了讨论。本文提出的结果提供了指导方针,为今后的实施磁通阶梯在实验装置利用合成尺寸。

英文摘要:

Flux ladders constitute the minimal setup enabling a systematic understanding of the rich physics of interacting particles subjected simultaneously to strong magnetic fields and a lattice potential. In this paper, the ground-state phase diagram of a flux-ladder model is mapped out using extensive density-matrix renormalization-group simulations. The emphasis is put on parameters which can be experimentally realized exploiting the internal states of potassium atoms as a synthetic dimension. The focus is on accessible observables such as the chiral current and the leg-population imbalance. Considering a particle filling of one boson per rung, we report the existence of a Mott-insulating Meissner phase as well as biased-ladder phases on top of superfluids and Mott insulators. Furthermore, we demonstrate that quantum quenches from suitably chosen initial states can be used to probe the equilibrium properties in the transient dynamics. Concretely, we consider the instantaneous turning on of hopping matrix elements along the rungs or legs in the synthetic flux-ladder model, with different initial particle distributions. We show that clear signatures of the biased-ladder phase can be observed in the transient dynamics. Moreover, the behavior of the chiral current in the transient dynamics is discussed. The results presented in this paper provide guidelines for future implementations of flux ladders in experimental setups exploiting a synthetic dimension.

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