scholarly journals Contributions to theory of quantum spin models: 60th anniversary of Oleg Derzhko

2020 ◽  
Vol 23 (4) ◽  
pp. 40102
Author(s):  
Strečka ◽  
Verkholyak
Keyword(s):  
Quantum Spin ◽  
60Th Anniversary ◽  
Spin Models ◽  
Quantum Spin Models

scholarly journals THOULESS NUMBER AND SPIN DIFFUSION IN QUANTUM HEISENBERG FERROMAGNETS

1993 ◽  
Vol 07 (27) ◽  
pp. 1747-1759 ◽  
Author(s):  
PETER KOPIETZ
Keyword(s):  
Spin Diffusion ◽  
Nearest Neighbor ◽  
Arbitrary Dimension ◽  
Quantum Spin ◽  
Spin Systems ◽  
Heisenberg Ferromagnet ◽  
Electronic Systems ◽  
Dimensionless Frequency ◽  
Spin Models ◽  
Quantum Spin Models

Using an analogy between the conductivity tensor of electronic systems and the spin stiffness tensor of spin systems, we introduce the concept of the Thouless number g0 and the dimensionless frequency-dependent conductance g(ω) for quantum spin models. It is shown that spin diffusion implies the vanishing of the Drude peak of g(ω), and that the spin diffusion coefficient Ds is proportional to g0. We develop a new method based the Thouless number to calculate D s , and present results for D s in the nearest-neighbor quantum Heisenberg ferromagnet at infinite temperatures for arbitrary dimension d and spin S.

scholarly journals Exactly solvable -type quantum spin models with long-range interaction

2009 ◽  
Vol 812 (3) ◽  
pp. 402-423 ◽  
Author(s):  
B. Basu-Mallick ◽  
F. Finkel ◽  
A. González-López
Keyword(s):  
Long Range ◽  
Quantum Spin ◽  
Range Interaction ◽  
Spin Models ◽  
Exactly Solvable ◽  
Long Range Interaction ◽  
Quantum Spin Models ◽  
Solvable Type
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