Néel State in the Fermionized Spin 1/2  Heisenberg  Antiferromagnet on Hypercubic and Triangular Lattices

Nguyen Toan Thang; Pham Thi Thanh Nga

doi:10.15625/0868-3166/22/1/631

Néel State in the Fermionized Spin 1/2 Heisenberg Antiferromagnet on Hypercubic and Triangular Lattices

Nguyen Toan Thang, Pham Thi Thanh Nga

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Authors

Nguyen Toan Thang
Pham Thi Thanh Nga Water Resources University, 175 Tay Son, Hanoi

DOI:

https://doi.org/10.15625/0868-3166/22/1/631

Abstract

We study the Néel state of the spin 1/2 Heisenberg antiferromagnet model on hypercubic and triangular lattices, employing an auxiliary fermion representation for spin operators with Popov-Fedotov trick. The unphysical states are eliminated on each site by introducing an imaginary chemical potential. Working in local coordinate systems we obtain the free energy and the sublattice magnetization for both lattices in an unified manner. We show that exact treatment of the single occupancy constraint gives a significant effect at finite temperatures.

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Published

07-05-2012

How to Cite

[1]

N. T. Thang and P. T. T. Nga, Néel State in the Fermionized Spin 1/2 Heisenberg Antiferromagnet on Hypercubic and Triangular Lattices, Comm. Phys. 22 (2012) 33–43. DOI: https://doi.org/10.15625/0868-3166/22/1/631.

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Issue

Vol. 22 No. 1 (2012)

Section

Papers

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