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- W2012593776 abstract "We develop a mean-field theory for random quantum spin systems using the spin coherent state path integral representation. After the model is reduced to the mean-field one-body Hamiltonian, the integral is analyzed with the aid of several methods such as the semiclassical method and the gauge transformation. As an application we consider the Sherrington-Kirkpatrick model in a transverse field. Using the Landau expansion and its improved versions, we give a detailed analysis of the imaginary-time dependence of the order parameters. Integrating out the quantum part of the order parameters, we obtain the effective renormalized free energy written in terms of the classically defined order parameters. Our method allows us to obtain the spin glass-paramagnetic phase transition point $ensuremath{Gamma}∕Jensuremath{sim}1.62$ at $T=0$." @default.
- W2012593776 created "2016-06-24" @default.
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- W2012593776 date "2007-11-19" @default.
- W2012593776 modified "2023-09-24" @default.
- W2012593776 title "Quantum fluctuations in the transverse Ising spin glass model: A field theory of random quantum spin systems" @default.
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- W2012593776 doi "https://doi.org/10.1103/physrevb.76.184422" @default.
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