Quantum phase transitions in the spin-boson model: Monte Carlo method versus variational approach à la Feynman
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DOI: 10.1103/physrevb.101.180408
Abstract: The effectiveness of the variational approach \`a la Feynman is proved in the spin-boson model, i.e., the simplest realization of the Caldeira-Leggett model able to reveal the quantum phase transition from delocalized to localized states… read more here.
Keywords: quantum phase; model; variational approach; phase ... See more keywords