Spin systems in strongly correlated random fields

1995 ◽  
Vol 140-144 ◽  
pp. 265-266
Author(s):  
L.L. Gonçalves
Keyword(s):  
Random Fields ◽  
Spin Systems ◽  
Strongly Correlated

ISING MODEL WITH STRONGLY CORRELATED RANDOM FIELDS

1988 ◽  
Vol 02 (10) ◽  
pp. 1137-1141 ◽  
Author(s):  
T. HORIGUCHI ◽  
L.L. GONCALVES
Keyword(s):  
Ising Model ◽  
Domain Wall ◽  
Long Range ◽  
Random Fields ◽  
Linear Chain ◽  
Ising Models ◽  
Range Order ◽  
Square Lattice ◽  
Long Range Order ◽  
Strongly Correlated

We investigate the Ising models with strongly correlated random fields, taking the values ±h0 and 0, on the square lattice and on the linear chain. The models present long range order and these results are consistent with the lower critical dimensionality obtained by the domain wall argument.

Crossover in spin systems with correlated random fields

1984 ◽  
Vol 30 (5) ◽  
pp. 2886-2890 ◽  
Author(s):  
B. Tadic ◽  
R. Pirc
Keyword(s):  
Random Fields ◽  
Spin Systems

Theory for dynamic lineshapes of strongly correlated two-spin systems

1989 ◽  
Vol 85 (2) ◽  
pp. 275-293 ◽  
Author(s):  
Nikolas P Benetis ◽  
David J Schneider ◽  
Jack H Freed
Keyword(s):  
Spin Systems ◽  
Strongly Correlated

scholarly journals SEMI-FERMIONIC REPRESENTATION FOR SPIN SYSTEMS UNDER EQUILIBRIUM AND NON-EQUILIBRIUM CONDITIONS

2006 ◽  
Vol 20 (04) ◽  
pp. 381-421 ◽  
Author(s):  
M. N. KISELEV
Keyword(s):  
Spin Systems ◽  
Distribution Functions ◽  
Strongly Correlated ◽  
Imaginary Time ◽  
Special Shape ◽  
Equilibrium Conditions ◽  
Occupation Numbers ◽  
General Derivation ◽  
Fermionic Representation ◽  
Keldysh Technique

We present a general derivation of semi-fermionic representation for spin operators in terms of a bilinear combination of fermions in real and imaginary time formalisms. The constraint on fermionic occupation numbers is fulfilled by means of imaginary Lagrange multipliers resulting in special shape of quasiparticle distribution functions. We show how Schwinger–Keldysh technique for spin operators is constructed with the help of semi-fermions. We demonstrate how the idea of semi-fermionic representation might be extended to the groups possessing dynamic symmetries. We illustrate the application of semi-fermionic representations for various problems of strongly correlated and mesoscopic physics.

scholarly journals Block product density matrix embedding theory for strongly correlated spin systems

2017 ◽  
Vol 95 (19) ◽  
Author(s):  
Klaas Gunst ◽  
Sebastian Wouters ◽  
Stijn De Baerdemacker ◽  
Dimitri Van Neck
Keyword(s):  
Density Matrix ◽  
Spin Systems ◽  
Strongly Correlated ◽  
Product Density ◽  
Embedding Theory ◽  
Matrix Embedding ◽  
Block Product
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