Smeared Quantum Phase Transition in the Dissipative Random Quantum Ising Model
We investigate the quantum phase transition in the random transverse-field Ising model under the influence of Ohmic dissipation. To this end, we numerically implement a strong-disorder renormalization-group scheme. We find that Ohmic dissipation destroys the quantum critical point and the associated quantum Griffiths phase by smearing. Our results quantitatively confirm a recent theory [J.A. Hoyos, T. Vojta, Phys. Rev. Lett. 100 (2008) 240601] of smeared quantum phase transitions.
T. Vojta and J. A. Hoyos, "Smeared Quantum Phase Transition in the Dissipative Random Quantum Ising Model," Physica E: Low-Dimensional Systems and Nanostructures, Elsevier, Jan 2010.
The definitive version is available at http://dx.doi.org/10.1016/j.physe.2009.06.067
National Science Foundation (U.S.)
University of Missouri Research Board
Keywords and Phrases
Dissipation; Quantum Phase Transition; Quenched Disorder
Article - Journal
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