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Dissipation effects in percolating quantum Ising magnets

✍ Scribed by José A. Hoyos; Thomas Vojta

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
135 KB
Volume
403
Category
Article
ISSN
0921-4526

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✦ Synopsis

We study the effects of dissipation on a randomly dilute transverse-field Ising magnet at and close to the percolation threshold. For weak transverse fields, a novel percolation quantum phase transition separates a super-paramagnetic cluster phase from an inhomogeneously ordered ferromagnetic phase. The properties of this transition are dominated by large frozen and slowly fluctuating percolation clusters. Implementing numerically a strong-disorder real space renormalization group technique, we compute the lowenergy density of states which is found to be in good agreement with the analytical prediction.

📜 SIMILAR VOLUMES

Dissipation and decoherence in quantum m
Dissipation and decoherence in quantum magnetic systems
✍ P.C.E. Stamp 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 721 KB

Dissipation and decoherence are reviewed for quantum magnets, in which quantum fluctuations render a semi-classical picture incorrect. This is done for 3 examples in detail. First, the tunneling of magnetic domain walls is considered-this is a typical quantum soliton problem, with dissipation being