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arXiv 1003.0992cond-mat.str-el
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修饰蜂窝晶格上的量子自旋金属态

Quantum spin metal state on a decorated honeycomb lattice

K. S. Tikhonov, M. V. Feigel'man

摘要:

本文提出了一个在修饰蜂窝晶格上精确可解的自旋-(1/2)Kitaev模型的修正,其基态为“自旋金属”型.该模型是对角化的马约拉纳费米子,后者形成一个2D的费米圆,其大小取决于交换耦合的比例的无隙状态。在小费米圆情况下,计算了低温热容C(T)和动态自旋磁化率χ(ω,T)。而C(T)\sim T在低温下与费米液体一样,自旋激发是有间隙的,χ(ω,T)表现出不寻常的行为,在共振频率附近具有幂律峰。计算了相应的指数和峰形。

英文摘要:

We present a modification of exactly solvable spin-(1/2) Kitaev model on the decorated honeycomb lattice, with a ground state of "spin metal" type. The model is diagonalized in terms of Majorana fermions; the latter form a 2D gapless state with a Fermi-circle those size depends on the ratio of exchange couplings. Low-temperature heat capacity C(T) and dynamic spin susceptibility χ(ω,T) are calculated in the case of small Fermi-circle. Whereas C(T)\sim T at low temperatures as it is expected for a Fermi-liquid, spin excitations are gapful and χ(ω,T) demonstrate unusual behaviour with a power-law peak near the resonance frequency. The corresponding exponent as well as the peak shape are calculated.

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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