Coupled-cluster approximation for spin lattices: Application to solidHe3

1990 ◽  
Vol 41 (1) ◽  
pp. 200-219 ◽  
Author(s):  
M. Roger ◽  
J. H. Hetherington
Keyword(s):  
Coupled Cluster ◽  
Cluster Approximation ◽  
Spin Lattices

Coupled-cluster approximation for the linearE-eJahn-Teller effect

1994 ◽  
Vol 50 (23) ◽  
pp. 17615-17617 ◽  
Author(s):  
W. H. Wong ◽  
C. F. Lo
Keyword(s):  
Teller Effect ◽  
Coupled Cluster ◽  
Cluster Approximation

scholarly journals Toward the efficient local tailored coupled cluster approximation and the peculiar case of oxo-Mn(Salen)

2019 ◽  
Vol 151 (8) ◽  
pp. 084112 ◽  
Author(s):  
Andrej Antalík ◽  
Libor Veis ◽  
Jiří Brabec ◽  
Ondřej Demel ◽  
Örs Legeza ◽  
...  
Keyword(s):  
Coupled Cluster ◽  
Cluster Approximation ◽  
Peculiar Case

OPTIMAL COUPLED-CLUSTER APPROXIMATION FOR THE E⊗(b1+b2) JAHN–TELLER EFFECT

2005 ◽  
Vol 19 (30) ◽  
pp. 4495-4515
Author(s):  
L. P. LO ◽  
C. F. LO
Keyword(s):  
Ground State ◽  
Teller Effect ◽  
Coupled Cluster ◽  
Mathematical Treatment ◽  
Cluster Approximation ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Interacting Systems ◽  
Coupling Strengths ◽  
Better Than

In this work we have applied the optimal coupled-cluster approximation to study the ground state of the E⊗(b1+b2) Jahn–Teller effect. The effectiveness of the optimal coupled-cluster approximation has been investigated for the whole range of the asymmetry parameter and various coupling strengths. It is shown that our results up to the third level of approximation are in very good agreement with the exact numerical diagonalization results and are better than those from earlier variational treatments. Furthermore, unlike previous variational treatments, the optimal coupled-cluster approximation has the advantage that the accuracy of both the ground state energy and wavefunction estimates is being taken care of and can be systematically improved. Since the mathematical treatment in this work is simple, the optimal coupled-cluster approximation could be easily extended to the studies of other fermion-boson interacting systems, e.g. the extended Jahn–Teller system.

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