Optimal coupled-cluster approximation for the ground-state properties of a spin-boson model

1998 ◽  
Vol 6 (2) ◽  
pp. 213-223 ◽  
Author(s):  
W.H. Wong ◽  
C.F. Lo
Keyword(s):  
Ground State ◽  
Coupled Cluster ◽  
Cluster Approximation ◽  
Ground State Properties ◽  
Boson Model

scholarly journals Symmetry and the critical phase of the two-bath spin-boson model: Ground-state properties

2015 ◽  
Vol 91 (19) ◽  
Author(s):  
Nengji Zhou ◽  
Lipeng Chen ◽  
Dazhi Xu ◽  
Vladimir Chernyak ◽  
Yang Zhao
Keyword(s):  
Ground State ◽  
Ground State Properties ◽  
Critical Phase ◽  
Boson Model

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.

scholarly journals Sub-Ohmic spin-boson model with off-diagonal coupling: Ground state properties

2013 ◽  
Vol 139 (16) ◽  
pp. 164103 ◽  
Author(s):  
Zhiguo Lü ◽  
Liwei Duan ◽  
Xin Li ◽  
Prathamesh M. Shenai ◽  
Yang Zhao
Keyword(s):  
Ground State ◽  
Ground State Properties ◽  
Boson Model ◽  
Diagonal Coupling

scholarly journals Ground-state properties of sub-Ohmic spin-boson model with simultaneous diagonal and off-diagonal coupling

2014 ◽  
Vol 90 (15) ◽  
Author(s):  
Nengji Zhou ◽  
Lipeng Chen ◽  
Yang Zhao ◽  
Dima Mozyrsky ◽  
Vladimir Chernyak ◽  
...  
Keyword(s):  
Ground State ◽  
Ground State Properties ◽  
Boson Model ◽  
Diagonal Coupling
Sign in / Sign up

Export Citation Format

Share Document