Hong-Fen Zheng

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The physics of a two-level system coupled to Ohmic bath is studied by means of the perturbation approach based on a unitary transformation. Our main results are: The coherence-incoherence transition is at α c = 1 2 [1 + ∆ r /ω c ]; for α < α c the dynamical quantity P (t) = cos(ω 0 t) exp(−γt); the sussceptibility χ ′′ (ω)/ω is of a double peak structure(More)
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