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• W2966056230 abstract "In quantum critical heavy fermion systems, local moments are coupled to both collective spin fluctuations and conduction electrons. As such, the Bose-Fermi Kondo model, describing the coupling of a local moment to both a bosonic and a fermionic bath, has been of extensive interest. For the model in the presence of SU(2) spin rotational symmetry, questions have been raised about its phase diagram. Here we develop a version of continuous-time Quantum Monte Carlo (CT-QMC) method suitable for addressing this issue; this procedure can reach sufficiently low temperatures while preserving the SU(2) symmetry. Using this method for the Bose-Fermi Anderson model, we clarify the renormalization-group fixed points and the phase diagram for the case with a constant fermionic-bath density of states and a power-law bosonic-bath spectral function $rho_{b}(omega) propto omega^{s}$ ($0<s<1$). We find two types of Kondo destruction QCP, depending on the power-law exponent $s$ in the bosonic bath spectrum. For $s^{*}<s<1$, both types of QCPs exist and, in the parameter regime accessible by an analytical $epsilon$-expansion renormalization-group calculation (here $epsilon=1-s$), the CT-QMC result is fully consistent with prior predictions by the latter method. For $s<s^{*}$, there is only one type of QCP. At both type of Kondo destruction QCPs, we find that the exponent of the local spin susceptibility $eta$ obeys the relation $eta=epsilon$, which has important implications for Kondo destruction QCP in the Kondo lattice problem." @default.
• W2966056230 created "2019-08-13" @default.
• W2966056230 creator A5054264525 @default.
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• W2966056230 date "2019-07-30" @default.
• W2966056230 modified "2023-10-15" @default.
• W2966056230 title "Bose-Fermi Anderson model with SU(2) symmetry: Continuous-time quantum Monte Carlo study" @default.
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• W2966056230 doi "https://doi.org/10.1103/physrevb.100.014439" @default.
• W2966056230 hasPublicationYear "2019" @default.
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