The spatially anisotropic triangular lattice antiferromagnet: Popov-Fedotov method

We present an analysis of the antiferromagnetic Heisenberg model on an triangular lattice with spatially anisotropic J1-J2 exchange interactions. We apply the Popov-Fedotov method based on introducing an imaginary valued chemical potential to enforce the auxiliary fermion constraint exactly. The sta...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 865; no. 1; pp. 12014 - 12020
Main Authors Nga, Pham Thi Thanh, Trang, Phan Thu, Thang, Nguyen Toan
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.06.2017
Subjects
Antiferromagnetism
Chemical potential
Fermions
Free energy
Heisenberg theory
Magnons
Physics
Statistical models
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Summary:We present an analysis of the antiferromagnetic Heisenberg model on an triangular lattice with spatially anisotropic J1-J2 exchange interactions. We apply the Popov-Fedotov method based on introducing an imaginary valued chemical potential to enforce the auxiliary fermion constraint exactly. The staggered magnetization, magnon spectra, free energy are computed in one loop approximation and compared using two different constraints: exact and on average. In the limit of zero temperature the results are identical, whereas at higher temperature significant differences are found. The comparisons with the results obtained by other methods are discussed.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/865/1/012014