Equilibrium and nonequilibrium dynamics of the sub-ohmic spin-boson model
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Contributors
Abstract
Employing the nonperturbative numerical renormalization group method, we study the dynamics of the spin-boson model, which describes a two-level system coupled to a bosonic bath with a spectral density J(ω) ωs. We show that, in contrast with the case of Ohmic damping, the delocalized phase of the sub-Ohmic model cannot be characterized by a single energy scale only, due to the presence of a nontrivial quantum phase transition. In the strongly sub-Ohmic regime, 1, weakly damped coherent oscillations on short time scales are possible even in the localized phase-this is of crucial relevance, e.g., for qubits subject to electromagnetic noise.
Details
Original language | English |
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Article number | 210402 |
Journal | Physical review letters |
Volume | 98 |
Issue number | 21 |
Publication status | Published - 24 May 2007 |
Peer-reviewed | Yes |
Externally published | Yes |