Quantum spin metal state on a decorated honeycomb lattice

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

Результат исследований: Вклад в журналСтатьярецензирование

23 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаАнглийский
Номер статьи067207
ЖурналPhysical Review Letters
Том105
Номер выпуска6
DOI
СостояниеОпубликовано - 6 авг. 2010
Опубликовано для внешнего пользованияДа

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