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Driven tunneling dynamics: Bloch-Redfield theory versus path-integral approach

Hartmann, Ludwig ; Goychuk, Igor ; Grifoni, Milena ; Hänggi, Peter


In the regime of weak bath coupling and low temperature we demonstrate numerically for the spin-boson dynamics the equivalence between two widely used but seemingly different roads of approximation, namely, the path-integral approach and the Bloch-Redfield theory. The excellent agreement between these two methods is corroborated by an efficient analytical high-frequency approach: it well ...


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