Understanding the dynamics of randomly positioned dipolar spin ensembles

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dc.contributor.authorGräßer, Timo
dc.contributor.authorRezai, Kristine
dc.contributor.authorSushkov, Alexander O.
dc.contributor.authorUhrig, Götz S.
dc.date.accessioned2023-12-22T12:37:30Z
dc.date.available2023-12-22T12:37:30Z
dc.date.issued2023-12-01
dc.description.abstractDipolar spin ensembles with random spin positions are attracting much attention because they help us to understand decoherence as it occurs in solid-state quantum bits in contact with spin baths. Also, these ensembles are systems which may show many-body localization, at least in the sense of very slow spin dynamics. We present measurements of the autocorrelations of spins on diamond surfaces at infinite temperature in a doubly rotating frame which eliminates local disorder. Strikingly, the timescales in the longitudinal and the transversal channel differ by more than one order of magnitude, which is a factor much greater than one would have expected from simulations of spins on lattices. A previously developed dynamic mean-field theory for spins (spinDMFT) fails to explain this phenomenon. Thus, we improve it by extending it to clusters (CspinDMFT). This theory does capture the striking mismatch up to two orders of magnitude for random ensembles. Without positional disorder, however, the mismatch is only moderate with a factor below 4. The pivotal role of positional disorder suggests that the strong mismatch is linked to precursors of many-body localization.en
dc.identifier.urihttp://hdl.handle.net/2003/42249
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-24086
dc.language.isoende
dc.relation.ispartofseriesPhysical review research;5(4)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/de
dc.subjectMany-body localizationen
dc.subjectSpin dynamicsen
dc.subjectRandom & disordered mediaen
dc.subjectMean field theoryen
dc.subjectSpin lattice modelsen
dc.subject.ddc530
dc.subject.rswkQuantenmechanisches Systemde
dc.subject.rswkSpindynamikde
dc.subject.rswkDynamische Molekularfeldtheoriede
dc.subject.rswkSpinmodellde
dc.titleUnderstanding the dynamics of randomly positioned dipolar spin ensemblesen
dc.typeTextde
dc.type.publicationtypeArticlede
dcterms.accessRightsopen access
eldorado.secondarypublicationtruede
eldorado.secondarypublication.primarycitationGräßer, T., Rezai, K., Sushkov, A. O., & Uhrig, G. S. (2023). Understanding the dynamics of randomly positioned dipolar spin ensembles. Physical Review Research, 5(4), Article 043191. https://doi.org/10.1103/physrevresearch.5.043191de
eldorado.secondarypublication.primaryidentifierDOI https://doi.org/10.1103/PhysRevResearch.5.043191de

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