Unified spin-wave theory for quantum spin systems with single-ion anisotropies

1999 ◽  
Vol 32 (38) ◽  
pp. 6687-6704 ◽  
Author(s):  
Lei Zhou ◽  
Yoshiyuki Kawazoe
Keyword(s):  
Spin Wave ◽  
Wave Theory ◽  
Quantum Spin ◽  
Spin Systems ◽  
Quantum Spin Systems ◽  
Spin Wave Theory

MODIFIED SPIN-WAVE THEORY FOR THE FRUSTRATED HEISENBERG ANTIFERROMAGNET ON A SQUARE LATTICE

2013 ◽  
Vol 27 (11) ◽  
pp. 1350021 ◽  
Author(s):  
YOU WU ◽  
YUAN CHEN
Keyword(s):  
Spin Wave ◽  
Quantum Monte Carlo ◽  
Present Method ◽  
Nearest Neighbors ◽  
Wave Theory ◽  
Exact Diagonalization ◽  
Quantum Spin ◽  
Square Lattice ◽  
Heisenberg Antiferromagnet ◽  
Spin Wave Theory

The effects of quantum fluctuations due to frustration between nearest neighbors and next-nearest neighbors of the quantum spin-half Heisenberg antiferromagnet on a square lattice are investigated by using the modified spin-wave theory (MSW). We have extended Takahashi's MSW theory, and studied the ground-state and finite-temperature properties of this model. The results calculated within this formalism on the thermodynamics agree quite well with the quantum Monte Carlo estimates, and exact diagonalization results. We have also compared the present method with the conventional spin wave theory.

scholarly journals Quantum Spin Systems at Positive Temperature

2006 ◽  
Vol 269 (3) ◽  
pp. 611-657 ◽  
Author(s):  
Marek Biskup ◽  
Lincoln Chayes ◽  
Shannon Starr
Keyword(s):  
Quantum Spin ◽  
Spin Systems ◽  
Positive Temperature ◽  
Quantum Spin Systems
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