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Title: Quantum phase transition in the delocalized regime of the spin-boson model
Authors: Tong, Q.-J. 
An, J.-H. 
Luo, H.-G.
Oh, C.H. 
Issue Date: 8-Nov-2011
Citation: Tong, Q.-J., An, J.-H., Luo, H.-G., Oh, C.H. (2011-11-08). Quantum phase transition in the delocalized regime of the spin-boson model. Physical Review B - Condensed Matter and Materials Physics 84 (17) : -. ScholarBank@NUS Repository.
Abstract: The existence of the delocalized-localized quantum phase transition (QPT) in the ohmic spin-boson model has been commonly recognized. While the physics in the localized regime is relatively simple, the delocalized regime shows many interesting behaviors. Here we reveal that in this regime there exists a novel QPT: namely, from a phase without a bound state to a phase with a bound state, which leads to completely different dynamical behaviors in these two phases. If the reservoir is initially in the displaced vacuum state (i.e., the coherent state), the spin dynamics exhibits lossless oscillation when the bound state exists; otherwise, the oscillation will decay completely. This result is compatible with the coherence-incoherence transition occurring in the small-tunneling limit. Our work indicates that the QPT physics in the spin-boson model needs further exploration. © 2011 American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.84.174301
Appears in Collections:Staff Publications

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