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- W2750318348 abstract "Fermi's golden rule applies to a situation in which a single quantum state $|psirangle$ is coupled to a near-continuum. This quasi-continuum coupling structure results in a rate equation for the population of $|psirangle$. Here we show that the coupling of a quantum system to the standard model of a thermal environment, a bath of harmonic oscillators, can be decomposed into a cascade made up of the quasi-continuum coupling structures of Fermi's golden rule. This clarifies the connection between the physics of the golden rule and that of a thermal bath, and provides a non-rigorous but physically intuitive derivation of the Markovian master equation directly from the former. The exact solution to the Hamiltonian of the golden rule, known as the Bixon-Jortner model, generalized for an asymmetric spectrum, provides a window on how the evolution induced by the bath deviates from the master equation as one moves outside the Markovian regime. Our analysis also reveals the relationship between the oscillator bath and the random matrix model (RMT) of a thermal bath. We show that the cascade structure is the one essential difference between the two models, and the lack of it prevents the RMT from generating transition rates that are independent of the initial state of the system. We suggest that the cascade structure is one of the generic elements of thermalizing many-body systems." @default.
- W2750318348 created "2017-08-31" @default.
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- W2750318348 date "2017-09-11" @default.
- W2750318348 modified "2023-10-03" @default.
- W2750318348 title "Fermi’s golden rule, the origin and breakdown of Markovian master equations, and the relationship between oscillator baths and the random matrix model" @default.
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- W2750318348 doi "https://doi.org/10.1088/1751-8121/aa8777" @default.
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