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• W2581308757 startingPage "060501" @default.
• W2581308757 abstract "Using the bosonic numerical renormalization group method, we studied the equilibrium dynamical correlation function C(ω) of the spin operator σz for the biased sub-Ohmic spin-boson model. The small-ω behavior is found to be universal and independent of the bias ε and the coupling strength α (except at the quantum critical point and ε = 0). Our NRG data also show for a wide range of parameters, including the biased strong coupling regime ( and ), supporting the general validity of the Shiba relation. Close to the quantum critical point , the dependence of C(ω) on α and ε is understood in terms of the competition between ε and the crossover energy scale of the unbiased case. C(ω) is stable with respect to ε for . For , it is suppressed by ε in the low frequency regime. We establish that holds for all sub-Ohmic regime , with for and for . The variation of C(ω) with α and ε is summarized into a crossover phase diagram on the α–ε plane." @default.
• W2581308757 created "2017-02-03" @default.
• W2581308757 creator A5026892384 @default.
• W2581308757 creator A5050198342 @default.
• W2581308757 date "2017-06-01" @default.
• W2581308757 modified "2023-09-25" @default.
• W2581308757 title "Equilibrium dynamics of the sub-Ohmic spin-boson model under bias" @default.
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• W2581308757 doi "https://doi.org/10.1088/1674-1056/26/6/060501" @default.
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