期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.237203
关键词
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资金
- EPSRC [EP/D050952/1]
- Engineering and Physical Sciences Research Council [EP/D050952/1] Funding Source: researchfish
- EPSRC [EP/D050952/1] Funding Source: UKRI
We study the consequences of disorder in the Kitaev honeycomb model, considering both site dilution and exchange randomness. We show that a single vacancy binds a flux and induces a local moment. This moment is polarized by an applied field h: in the gapless phase, for small h the local susceptibility diverges as chi(h) similar to ln(1/h); for a pair of nearby vacancies on the same sublattice, this even increases to chi(h) similar to 1/(h[ln(1/h)](3/2)). By contrast, weak exchange randomness does not qualitatively alter the susceptibility but has its signature in the heat capacity, which in the gapless phase is power law in temperature with an exponent dependent on disorder strength.
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