Spectral Gaps and Incompressibility in a $${\varvec{\nu }}$$ = 1/3 Fractional Quantum Hall System

Spectral Gaps and Incompressibility in a $${\varvec{\nu }}$$ = 1/3 Fractional Quantum Hall System
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$${varvec{ u }}$$=1/3 分数量子霍尔系统中的光谱间隙和不可压缩性

DOI:
10.1007/s00220-021-03997-0
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发表时间:
2021
影响因子:
2.4
通讯作者:
Young, Amanda
Young, Amanda
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Nachtergaele, Bruno;Warzel, Simone;Young, Amanda

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本文研究了薄圆柱体系中标准分数量子Hall系统的有效哈密顿量.我们给出了一个完整的描述,其基态空间中,我们称之为碎片矩阵产品的国家,这是由一定的家庭平铺的一维晶格标记。然后,我们证明了该模型有一个光谱间隙以上的基态的耦合常数,包括物理值的范围。作为差距的结果,我们建立了分数量子霍尔态的不可压缩性。我们还表明,所有的地面状态标记的平铺有一个有限的相关长度,我们给一个上限。然而,我们通过例子证明,并不是所有的叠加平铺状态的相关性指数衰减。
We study an effective Hamiltonian for the standardfractional quantum Hall system in the thin cylinder regime. We give a complete description of its ground state space in terms of what we call Fragmented Matrix Product States, which are labeled by a certain family of tilings of the one-dimensional lattice. We then prove that the model has a spectral gap above the ground states for a range of coupling constants that includes physical values. As a consequence of the gap we establish the incompressibility of the fractional quantum Hall states. We also show that all the ground states labeled by a tiling have a finite correlation length, for which we give an upper bound. We demonstrate by example, however, that not all superpositions of tiling states have exponential decay of correlations.
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