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dc.contributor.authorPixley, J.H.
Kirchner, Stefan
Ingersent, Kevin
Si, Qimiao
dc.date.accessioned 2017-08-04T12:30:01Z
dc.date.available 2017-08-04T12:30:01Z
dc.date.issued 2013
dc.identifier.citation Pixley, J.H., Kirchner, Stefan, Ingersent, Kevin, et al.. "Quantum criticality in the pseudogap Bose-Fermi Anderson and Kondo models: Interplay between fermion- and boson-induced Kondo destruction." Physical Review B, 88, no. 24 (2013) American Physical Society: https://doi.org/10.1103/PhysRevB.88.245111.
dc.identifier.urihttps://hdl.handle.net/1911/96587
dc.description.abstract We address the phenomenon of critical Kondo destruction in pseudogap Bose-Fermi Anderson and Kondo quantum impurity models. These models describe a localized level coupled both to a fermionic bath having a density of states that vanishes like |ε|r at the Fermi energy (ε=0) and, via one component of the impurity spin, to a bosonic bath having a sub-Ohmic spectral density proportional to |ω|s. Each bath is capable by itself of suppressing the Kondo effect at a continuous quantum phase transition. We study the interplay between these two mechanisms for Kondo destruction using continuous-time quantum Monte Carlo for the pseudogap Bose-Fermi Anderson model with 0<r<12and 12≤s<1, and applying the numerical renormalization group to the corresponding Kondo model. At particle-hole symmetry, the models exhibit a quantum-critical point between a Kondo (fermionic strong-coupling) phase and a localized (Kondo-destroyed) phase. The two solution methods, which are in good agreement in their domain of overlap, provide access to the many-body spectrum, as well as to correlation functions including, in particular, the single-particle Green's function and the static and dynamical local spin susceptibilities. The quantum-critical regime exhibits the hyperscaling of critical exponents and ω/T scaling in the dynamics that characterize an interacting critical point. The (r,s)plane can be divided into three regions: one each in which the calculated critical properties are dominated by the bosonic bath alone or by the fermionic bath alone, and between these two regions, a third in which the bosonic bath governs the critical spin response but both baths influence the renormalization-group flow near the quantum-critical point.
dc.language.iso eng
dc.publisher American Physical Society
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.title Quantum criticality in the pseudogap Bose-Fermi Anderson and Kondo models: Interplay between fermion- and boson-induced Kondo destruction
dc.type Journal article
dc.citation.journalTitle Physical Review B
dc.citation.volumeNumber 88
dc.citation.issueNumber 24
dc.identifier.digital Quantum_criticality
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.88.245111
dc.type.publication publisher version
dc.citation.articleNumber 245111


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