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cond-mat.stat-mech1998
Effective Hamiltonian with holomorphic variables
A. Cuccoli, V. Tognetti, R. Giachetti +2
The pure-quantum self-consistent harmonic approximation (PQSCHA) permits to study a quantum system by means of an effective classical Hamiltonian. In this work the PQSCHA is reform…
cond-mat.stat-mech1998
Effective Hamiltonian, Mori Product and Quantum Dynamics
A. Cuccoli, V. Tognetti, R. Giachetti +1
An appropriate extension of the effective potential theory is presented that permits the approximate calculation of the dynamical correlation functions for quantum systems. These a…