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dc.contributor.authorWurtz, Jonathanen_US
dc.contributor.authorClaeys, Pieter W.en_US
dc.contributor.authorPolkovnikov, Anatolien_US
dc.date.accessioned2020-04-28T14:07:23Z
dc.date.available2020-04-28T14:07:23Z
dc.identifier.citationJonathan Wurtz, Pieter W Claeys, Anatoli Polkovnikov. "Variational Schrieffer-Wolff transformations for quantum many-body dynamics." Physical Review B, Volume 101, Issue 1, https://doi.org/10.1103/physrevb.101.014302
dc.identifier.issn2469-9950
dc.identifier.issn2469-9969
dc.identifier.urihttps://hdl.handle.net/2144/40389
dc.description.abstractBuilding on recent results for adiabatic gauge potentials, we propose a variational approach for computing the generator of Schrieffer-Wolff transformations. These transformations consist of block diagonalizing a Hamiltonian through a unitary rotation, which leads to effective dynamics in a computationally tractable reduced Hilbert space. The generators of these rotations are computed variationally and thus go beyond standard perturbative methods, with error controlled by the locality of the variational ansatz. The method is demonstrated on two models. First, in the attractive Fermi-Hubbard model with onsite disorder, we find indications of a lack of observable many-body localization in the thermodynamic limit due to the inevitable mixture of different spinon sectors. Second, in the low-energy sector of the XY spin model with a broken U(1) symmetry, we analyze ground-state response functions by combining the variational Schrieffer-Wolf transformation with the truncated spectrum approach.en_US
dc.languageen
dc.language.isoen_US
dc.publisherAmerican Physical Society (APS)en_US
dc.relation.ispartofPhysical Review B
dc.rights"© 2019 American Physical Society. The final published version of this article appears in OpenBU by permission of the publisher."en_US
dc.subjectApproximation methods for many-body systemsen_US
dc.subjectStrongly correlated electronsen_US
dc.titleVariational Schrieffer-Wolff transformations for quantum many-body dynamicsen_US
dc.typeArticleen_US
dc.description.versionPublished versionen_US
dc.identifier.doi10.1103/physrevb.101.014302
pubs.elements-sourcecrossrefen_US
pubs.notesEmbargo: Not knownen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Physicsen_US
pubs.publication-statusPublished onlineen_US
dc.date.online2020-01-10
dc.identifier.orcid0000-0002-5549-7400 (Polkovnikov, Anatoli)
dc.identifier.mycv519436


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