Variational ground state of the model of a two-state system coupled with phonons
- 1 December 1989
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (16) , 11326-11327
- https://doi.org/10.1103/physrevb.40.11326
Abstract
The ground state of the model of a two-state system coupled with phonons is studied by a variational method. Two trial states, the displaced state, and the displaced-squeezed state, for the phonon subsystem are compared, and their dependence on tunneling parameter Δ, phonon frequency ω, and coupling strength g is analyzed. We find that for Δ/ω≪1 the displaced state is more stable for g/ω, while the displaced-squeezed state is preferable for g/ω>1.Keywords
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