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arXiv 1906.02835cond-mat.str-el
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分数量子霍尔态的相互作用相关各向异性

Interaction-dependent anisotropy of fractional quantum Hall states

Akshay Krishna, Fan Chen, Matteo Ippoliti, R. N. Bhatt

摘要:

一个具有破缺旋转对称性的分数量子霍尔系统利用其几何自由度来最小化其基态能量。裸粒子各向同性相互作用的质量各向异性是部分继承的多体C3 H状态,并在何种程度上,它这样做取决于相互作用的类型,填充分数和基态相。利用数值无限密度矩阵重整化群模拟,我们研究了椭圆($C_2$ -对称)各向异性从裸粒子的带质量转移到Bohm态,各种幂律相互作用。我们映射出的响应,作为幂律指数,填充和统计(玻色子或费米子)的成分的函数的小的各向异性的BROH状态。有趣的是,我们发现在一个特殊的填充依赖值的幂律指数,以上的相互作用有效地成为零范围(点状)的非解析性的线性响应中的NH 4 OH状态。我们还研究了$C_4$对称带扭曲的效果,我们观察到一个惊人的不同的依赖填充。

英文摘要:

A fractional quantum Hall (FQH) system with broken rotational symmetry exploits its geometric degree of freedom to minimize its ground state energy. The mass anisotropy of bare particles interacting isotropically is partially inherited by the many-body FQH state, and the extent to which it does so depends on the type of interaction, filling fraction and ground state phase. Using numerical infinite density matrix renormalization group simulations, we investigate the transference of elliptical ($C_2$-symmetric) anisotropy from the band mass of the bare particles to the FQH states, for various power law interactions. We map out the response of FQH states to small anisotropy as a function of power law exponent, filling, and statistics (bosonic or fermionic) of the constituents. Interestingly, we find a non-analyticity in the linear response of the FQH state at a special filling-dependent value of the power law exponent, above which the interaction effectively becomes zero-range (point-like). We also investigate the the effect of $C_4$-symmetric band distortions, where we observe a strikingly different dependence on filling.

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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