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Entanglement and quantum phase transition of spin glass: A renormalization group approach
Citation
Koh, C. Y., & Kwek, L. C. (2014). Entanglement and quantum phase transition of spin glass: A renormalization group approach. Physics Letters A, 378(37), 2743-2749. https://doi.org/10.1016/j.physleta.2014.07.042
Abstract
Using a renormalization group approach, we study the entanglement properties of two spin glass models: the XXZ Heisenberg (with Dzyaloshinskii-Moriya interaction) and Ising transverse fi eld spin glasses. The concurrence for both models are obtained through the Kadanoff 's renormalization group (RG) approach with random Jzi and Ji respectively. The constant couplings in the RG flow is randomized through the Gaussian distribution. For Δ = 0 corresponding to a non-spin glass material, a first-order transition is expected. By varying Δ= 0.05 to 0.5, the spin glass e ffect broadens the sharp transition resulting in a second-order-like transition. The fluctuations in the average concurrence for the spin glass case as measured by the standard deviations is also a good indicator of quantum phase transition.
Date Issued
2014
Publisher
Elsevier
Journal
Physics Letters A