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arXiv 1602.07523cond-mat.mes-hallcond-mat.quant-gas
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动量空间中的量子霍尔效应

Quantum Hall effect in momentum space

Tomoki Ozawa, Hannah M. Price, Iacopo Carusotto

摘要:

我们从理论上讨论了量子霍尔效应的动量-空间模拟,它可以在拓扑非平凡晶格模型中观察到。在我们的方案中,环面上的量子霍尔效应的牛-无-吴公式是在环面布里渊区中实现的。在这个类比中,陷阱中心在真实空间中的位置控制着通过动量空间中的圆环孔插入的磁通量。我们说明了动量空间量子霍尔效应与非相互作用的捕获哈珀-霍夫施塔特模型,我们数值演示了这种效果如何体现在实验观测。扩展到相互作用的捕获哈珀-霍夫施塔特模型也被简要考虑。最后,我们讨论了可能的实验平台,我们的建议的动量空间量子霍尔效应可以实现。

英文摘要:

We theoretically discuss a momentum-space analog of the quantum Hall effect, which could be observed in topologically nontrivial lattice models subject to an external harmonic trapping potential. In our proposal, the Niu-Thouless-Wu formulation of the quantum Hall effect on a torus is realized in the toroidally shaped Brillouin zone. In this analogy, the position of the trap center in real space controls the magnetic fluxes that are inserted through the holes of the torus in momentum space. We illustrate the momentum-space quantum Hall effect with the noninteracting trapped Harper-Hofstadter model, for which we numerically demonstrate how this effect manifests itself in experimental observables. Extension to the interacting trapped Harper-Hofstadter model is also briefly considered. We finally discuss possible experimental platforms where our proposal for the momentum-space quantum Hall effect could be realized.

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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