Wednesday, March 7, 2012

1110.6314 (Cheng Guo et al.)

Critical and strong-coupling phases in one- and two-bath spin-boson
models
   [PDF]

Cheng Guo, Andreas Weichselbaum, Jan von Delft, Matthias Vojta
For phase transitions in dissipative quantum impurity models, the existence of a quantum-to-classical correspondence has been discussed extensively. We introduce a variational matrix product state approach involving an optimized boson basis, rendering possible high-accuracy numerical studies across the entire phase diagram. For the sub-ohmic spin-boson model with a power-law bath spectrum $\propto \w^s$, we confirm classical mean-field behavior for $s<1/2$, correcting earlier numerical renormalization-group results. We also provide the first results for an XY-symmetric model of a spin coupled to two competing bosonic baths, where we find a rich phase diagram, including both critical and strong-coupling phases for $s<1$, different from that of classical spin chains. This illustrates that symmetries are decisive for whether or not a quantum-to-classical correspondence exists.
View original: http://arxiv.org/abs/1110.6314

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