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arXiv 2104.09670cond-mat.str-el
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具有四重旋转对称相互作用的各向异性量子Hall态

Anisotropic quantum Hall states in the presence of interactions with fourfold rotational symmetry

Prashant Kumar, R. N. Bhatt

摘要:

研究了在四重离散旋转($C_4$)对称性存在下量子霍尔效应中各向异性相互作用的影响。利用无限圆柱几何上的密度矩阵重整化群方法(iDMRG),计算了$ν=1/3$的Laughlin态和$ν=1/2$的复合费米液体(CFL)态的各向异性响应.我们发现从相互作用势转移到$ν=1/3$态的各向异性比互补的各向异性带的情况更强。此外,各向异性的强度随着相互作用的范围变短而减小。令人惊讶的是,在$ν=1/2$,我们发现,CF费米面的变形的变化的迹象,作为相互作用范围减少。我们的结果表明,在$C_4$对称各向异性的存在下,相互作用势的长、短距离部分对CFL态有相反的影响。

英文摘要:

We study the effects of anisotropic interactions in the quantum Hall effect in the presence of a fourfold discrete rotational ($C_4$) symmetry. Employing the density matrix renormalization group technique on an infinite cylinder geometry (iDMRG), we calculate the anisotropy response of the Laughlin state at $ν=1/3$ and the composite-Fermi liquid (CFL) state at $ν=1/2$. We find that the anisotropy transferred from the interaction potential to the $ν=1/3$ state is stronger when compared to the complementary case of an anisotropic band. Further, the strength of anisotropy reduces as the interaction is made shorter ranged. Quite surprisingly, at $ν=1/2$, we find that the deformation in the CF Fermi-surface changes sign as the interaction range is reduced. Our results imply that the short-distance and long-distance parts of the interaction potential have opposite effects on the CFL state in the presence of $C_4$-symmetric anisotropy.

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