Quantum criticality in the pseudogap Bose-Fermi Anderson and Kondo models: Interplay between fermion- and boson-induced Kondo destruction

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dc.citation.articleNumber245111en_US
dc.citation.issueNumber24en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber88en_US
dc.contributor.authorPixley, J.H.en_US
dc.contributor.authorKirchner, Stefanen_US
dc.contributor.authorIngersent, Kevinen_US
dc.contributor.authorSi, Qimiaoen_US
dc.date.accessioned2017-08-04T12:30:01Zen_US
dc.date.available2017-08-04T12:30:01Zen_US
dc.date.issued2013en_US
dc.description.abstractWe 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.en_US
dc.identifier.citationPixley, 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." <i>Physical Review B,</i> 88, no. 24 (2013) American Physical Society: https://doi.org/10.1103/PhysRevB.88.245111.en_US
dc.identifier.digitalQuantum_criticalityen_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.88.245111en_US
dc.identifier.urihttps://hdl.handle.net/1911/96587en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsArticle 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.en_US
dc.titleQuantum criticality in the pseudogap Bose-Fermi Anderson and Kondo models: Interplay between fermion- and boson-induced Kondo destructionen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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