Realizing the Harper model with ultracold atoms in a ring lattice

Realizing the Harper model with ultracold atoms in a ring lattice
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用环晶格中的超冷原子实现哈珀模型

DOI:
10.1103/physreva.99.013604
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发表时间:
2019
期刊:
影响因子:
2.9
通讯作者:
Christ, Jacob
Christ, Jacob
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Das, Kunal K.;Christ, Jacob

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我们证明,所有的显着特点的哈珀-霍夫施塔特模型可以实现与超冷原子被困在一个双色环形晶格。使用现实的正弦晶格势,而不是假设理想化的紧束缚的图片,我们确定必要的最佳条件来实现的临界点,频谱成为分形,我们确定的性质和原因的偏离离散模型预测。我们还表明,即使有一个公度环与几个晶格位置,Aubry-André本地化转变可以实现。局域态的行为类似于边缘态,其能量位于带隙中,可以通过在环内引入令人惊讶的小的局部扰动来产生。由复杂耦合引起的光谱振荡可以通过环的均匀旋转来实现,但具有某些显著的差异,并对此进行了解释。
We demonstrate that all of the salient features of the Harper-Hofstadter model can be implemented with ultracold atoms trapped in a bichromatic ring-shaped lattice. Using realistic sinusoidal lattice potentials rather than assume the idealized tight-binding picture, we determine the optimal conditions necessary to realize the critical point where the spectrum becomes fractal, and we identify the nature and cause of the departures from the discrete model predictions. We also show that even with a commensurate ring with a few lattice sites, the Aubry-André localization transition can be realized. Localized states that behave like edge states with energies that reside in the band gaps can be generated by introducing a surprisingly small local perturbation within the ring. Spectrum oscillation arising from complex coupling can be implemented by uniform rotation of the ring, but with certain significant differences that are explained.
DOI: 10.1209/0295-5075/118/56004
发表时间: 2017
期刊: Europhysics Letters
影响因子: --
作者:
Mekena Metcalf;Chen;K. Wright;C. Chien
通讯作者: C. Chien
DOI: 10.1103/physrevb.88.125118
发表时间: 2013-07
期刊: Physical Review B
影响因子: 3.7
作者:
Kevin A. Madsen;E. Bergholtz;P. Brouwer
通讯作者: Kevin A. Madsen;E. Bergholtz;P. Brouwer