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- W2080976213 abstract "We describe the generalization of Wilson's numerical renormalization group method to quantum impurity models with a bosonic bath, providing a general nonperturbative approach to bosonic impurity models which can access exponentially small energies and temperatures. As an application, we consider the spin-boson model, describing a two-level system coupled to a bosonic bath with power-law spectral density, J(omega) proportional to omega(s). We find clear evidence for a line of continuous quantum phase transitions for sub-Ohmic bath exponents 0<s<1; the line terminates in the well-known Kosterlitz-Thouless transition at s=1. Contact is made with results from perturbative renormalization group, and various other applications are outlined." @default.
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- W2080976213 date "2003-10-24" @default.
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- W2080976213 title "Numerical Renormalization Group for Bosonic Systems and Application to the Sub-Ohmic Spin-Boson Model" @default.
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- W2080976213 doi "https://doi.org/10.1103/physrevlett.91.170601" @default.
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