Quantum spin metal state on a decorated honeycomb lattice

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

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23 Citations (Scopus)

Abstract

We present a modification of the exactly solvable spin-12 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 whose 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)∼T at low temperatures as it is expected for a Fermi liquid, spin excitations are gapped and χ(ω,T) demonstrates unusual behavior with a power-law peak near the resonance frequency. The corresponding exponent as well as the peak shape are calculated.

Original languageEnglish
Article number067207
JournalPhysical Review Letters
Volume105
Issue number6
DOIs
Publication statusPublished - 6 Aug 2010
Externally publishedYes

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