Program

P.7 -- Poster, NCTP-40

Date: Monday, 27 July 2015

Time: 14h00 - 15h30

The ordered phase in the Spin -1 Heisenberg model with strict single occupancy.

Pham Thi Thanh Nga (1), Nguyen Toan Thang (2)

(1) Thuy loi University, 175 Tay Son St., Hanoi; (2) Institute of Physics, Vietnamese Academy of Science and Technology, 10 Dao Tan, Hanoi.

In 1988 Popov and Fedotov proposed a new approach for spin - 1/2 and spin -1 systems. The Popov-Fedotov method has been applied for various problems of strongly correlated physics for the case of 1/2-spin. In this report we present a study of ordered phases in the fermionized spin-1 Heisenberg models when the constraint of strict single particle site occupation is taken into account by Popov–Fedotov trick. We discuss the quantum and thermal fluctuations at one-loop level for the partition function obtained by means of saddle point approximation in functional integral approach.

Presenter: Pham Thi Thanh Nga