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Smeared quantum phase transition in the dissipative random quantum Ising model
Preprint
2008-11-23
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Abstract
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 [Phys. Rev. Lett. {\bf 100}, 240601
(2008)] of smeared quantum phase transitions.