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arXiv 2302.09701cond-mat.str-el
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一维 Kondo 绝缘体中自旋分数化的矩阵乘积态研究

Matrix Product Study of Spin Fractionalization in the 1D Kondo Insulator

Jing Chen, E. Miles Stoudenmire, Yashar Komijani, Piers Coleman

AI总结:

本文利用含时矩阵乘积态方法研究一维 Kondo 晶格,发现复合费米子算符能产生覆盖低能谱的长寿命分数化准粒子,且其剩余相互作用在弱耦合下趋于消失。

摘要:

Kondo 晶格是强关联电子系统的经典范例之一。我们在一维情形下对 Kondo 晶格进行了受控研究,重点探讨了由复合费米子算符产生的激发所起的作用。利用含时矩阵乘积态方法,我们计算了多种关联函数,并将其与 large-N 平均场理论及强耦合展开进行了对比。我们表明,复合费米子算符能产生长寿命、电荷为 e 且自旋为 1/2 的激发,这些激发覆盖了该系统的低能单粒子激发谱。此外,自旋激发可被视为由这类分数化准粒子组成,它们之间的剩余相互作用在弱 Kondo 耦合下趋于消失。

英文摘要:

The Kondo lattice is one of the classic examples of strongly correlated electronic systems. We conduct a controlled study of the Kondo lattice in one dimension, highlighting the role of excitations created by the composite fermion operator. Using time-dependent matrix-product-state methods we compute various correlation functions and contrast them with both large-N mean-field theory and the strong-coupling expansion. We show that the composite fermion operator creates long-lived, charge-e and spin-1/2 excitations, which cover the low-lying single-particle excitation spectrum of the system. Furthermore, spin excitations can be thought to be composed of such fractionalized quasi-particles with a residual interaction which tend to disappear at weak Kondo coupling.

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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