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arXiv 0908.1614cond-mat.str-el
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自旋半模型中具有费米面的精确量子自旋液体

Exact quantum spin liquids with Fermi surfaces in spin-half models

G. Baskaran, G. Santhosh, R. Shankar

摘要:

安德森在1987年提出了莫特绝缘体中的费米面,这是一种奇特的量子自旋液体态。赝费米面的存在性在RVB平均场论的正方格子自旋半海森堡模型中得到了迅速的支持之后,最近才由Yao,Zhang和Kivelson在一个精确可解的自旋3/2模型中发现。我们证明了一个最小自旋半Kitaev模型的装饰正方形晶格上表现出费米面。费米面的体积和形状随着交换耦合或加入3自旋相互作用项而改变。

英文摘要:

An emergent Fermi surface in a Mott insulator, an exotic quantum spin liquid state, was suggested by Anderson in 1987. After a quick support for its existence in spin-half Heisenberg model in a square lattice in a RVB mean field theory, pseudo Fermi surface was found only recently in an exactly solvable spin-3/2 model by Yao, Zhang and Kivelson. We show that a minimal spin-half Kitaev model on a decorated square lattice exhibits a Fermi surface. Volume and shape of the Fermi surface change with exchange couplings or on addition of a 3 spin interaction terms.

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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