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arXiv 2106.02115cond-mat.str-elcond-mat.quant-gas
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正方晶格上的阿贝尔SU $(N)_1$手性自旋液体

Abelian SU$(N)_1$ Chiral Spin Liquids on the Square Lattice

Ji-Yao Chen, Jheng-Wei Li, Pierre Nataf, Sylvain Capponi, Matthieu Mambrini, Keisuke Totsuka, Hong-Hao Tu, Andreas Weichselbaum, Jan von Delft, Didier Poilblanc

摘要:

在分数量子霍尔(Fractional Quantum Hall,缩写为FWHH)效应的物理学中,通过改变磁场可以获得大量的阿贝尔拓扑相位。为了在类自旋系统中达到相同的现象学,我们在基本表示中提出了一个SU($N$)对称模型族,在短程相互作用限制为三角形单元的正方形晶格上,对先前研究的SU($3$)模型的任意$N$进行了自然推广,其中时间反演对称性被明确破缺。在最近发现的SU($2$)$_1$和SU($3$)$_1$手性自旋液体(CSL)的基础上,我们结合精确对角化(ED)、无限密度矩阵重整化群(iDMRG)和无限投射纠缠对态(iPEPS)等互补数值方法,在一定的哈密顿参数范围内寻找拓扑SU($N$)$_1$ CSL.广泛的ED小(周期性和开放)集群高达$N=10$和创新的SU($N$)对称版本的iDMRG计算纠缠光谱(无限长)圆柱体在所有拓扑部门提供明确的签名的SU($N$)$_1$字符的手性液体。一个SU($4$)对称的手征PEPS,以类似于其SU($2$)和SU($3$)类似物的方式构建,给出了一个很好的变分anadoration的$N=4$基态,手征边缘模式起源于PEPS全息体边缘对应。最后,我们讨论了在超冷原子设置中可能观察到的阿贝尔CSL,其中改变$N$的可能性提供了一个类似于磁场的调谐参数在物理学中的PITCH效应。

英文摘要:

In the physics of the Fractional Quantum Hall (FQH) effect, a zoo of Abelian topological phases can be obtained by varying the magnetic field. Aiming to reach the same phenomenology in spin-like systems, we propose a family of SU($N$)-symmetric models in the fundamental representation, on the square lattice with short-range interactions restricted to triangular units, a natural generalization for arbitrary $N$ of an SU($3$) model studied previously where time-reversal symmetry is broken explicitly. Guided by the recent discovery of SU($2$)$_1$ and SU($3$)$_1$ chiral spin liquids (CSL) on similar models we search for topological SU($N$)$_1$ CSL in some range of the Hamiltonian parameters via a combination of complementary numerical methods such as exact diagonalizations (ED), infinite density matrix renormalization group (iDMRG) and infinite Projected Entangled Pair State (iPEPS). Extensive ED on small (periodic and open) clusters up to $N=10$ and an innovative SU($N$)-symmetric version of iDMRG to compute entanglement spectra on (infinitely-long) cylinders in all topological sectors provide unambiguous signatures of the SU($N$)$_1$ character of the chiral liquids. An SU($4$)-symmetric chiral PEPS, constructed in a manner similar to its SU($2$) and SU($3$) analogs, is shown to give a good variational ansatz of the $N=4$ ground state, with chiral edge modes originating from the PEPS holographic bulk-edge correspondence. Finally, we discuss the possible observation of such Abelian CSL in ultracold atom setups where the possibility of varying $N$ provides a tuning parameter similar to the magnetic field in the physics of the FQH effect.

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