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dc.contributor.authorAgarwal, Kartiek
dc.contributor.authorMartin, Ivar
dc.contributor.authorLukin, Mikhail D.
dc.contributor.authorDemler, Eugene A.
dc.date.accessioned2014-06-10T16:49:13Z
dc.date.issued2013
dc.identifier.citationAgarwal, Kartiek, Ivar Martin, Mikhail Lukin, and Eugene Demler. 2013. “Polaronic Model of Two-Level Systems in Amorphous Solids.” Physical Review B 87 (14) (April).en_US
dc.identifier.issn1098-0121en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:12285467
dc.description.abstractWhile two-level systems (TLSs) are ubiqitous in solid state systems, microscopic understanding of their nature remains an outstanding problem. Conflicting phenomenological models are used to describe TLSs in seemingly similar materials when probed with different experimental techniques. Specifically, bulk measurements in amorphous solids have been interpreted using the model of a tunneling atom or group of atoms, whereas TLSs observed in the insulating barriers of Josephson junction qubits have been understood in terms of tunneling of individual electrons. Motivated by recent experiments studying TLSs in Josephson junctions, especially the effects of elastic strain on TLS properties, we analyze the interaction of the electronic TLS with phonons. We demonstrate that strong polaronic effects lead to dramatic changes in TLS properties. Our model gives a quantitative understanding of the TLS relaxation and dephasing as probed in Josephson junction qubits, while providing an alternative interpretation of bulk experiments. We demonstrate that a model of polaron dressed electronic TLS leads to estimates for the density and distribution of parameters of TLSs consistent with bulk experiments in amorphous solids. This model explains such surprising observations of recent experiments as the existence of minima in the energy of some TLSs as a function of strain and makes concrete predictions for the character of TLS dephasing near such minima. We argue that better understanding of the microscopic nature of TLSs can be used to improve properties of quantum devices, from an enhancement of relaxation time of TLSs to creating new types of strongly interacting optomechanical systems.en_US
dc.description.sponsorshipPhysicsen_US
dc.language.isoen_USen_US
dc.publisherAmerican Physical Society (APS)en_US
dc.relation.isversionofdoi:10.1103/PhysRevB.87.144201en_US
dash.licenseLAA
dc.titlePolaronic model of two-level systems in amorphous solidsen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalPhysical Review Ben_US
dash.depositing.authorLukin, Mikhail D.
dc.date.available2014-06-10T16:49:13Z
dc.identifier.doi10.1103/PhysRevB.87.144201*
workflow.legacycommentsFAR 2014en_US
dash.contributor.affiliatedAgarwal, Kartiek
dash.contributor.affiliatedLukin, Mikhail
dash.contributor.affiliatedDemler, Eugene


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