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- W2092091201 abstract "The ground state of a two-level system coupled to a dispersionless phonon bath is studied using the coherent approximation method. The ground-state energy and the tunneling reduction factor we obtain are in good agreement with the exact values in the whole parameter space. Since the real ground-state wave functions are well simulated, some other physical information about the system, such as the interaction energy and the interaction phonon numbers in each level and the whole system, are given. The interaction phonon numbers in the two-level system are found to increase with the coupling parameter s. In the intermediate coupling region, phenomenon of the population inversion and a maximum for the interaction phonon numbers versus ${ensuremath{delta}}_{0}/s$ have been found. Consisting with the exact results, our results show there is no evidence of the discontinuous localization-delocalization transition." @default.
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- W2092091201 date "2000-12-15" @default.
- W2092091201 modified "2023-09-24" @default.
- W2092091201 title "Ground state of a dissipative two-level system" @default.
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- W2092091201 doi "https://doi.org/10.1103/physrevb.62.15579" @default.
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