DC Field | Value | Language |
dc.contributor.author | Steinigeweg, Robin | |
dc.contributor.author | Herbrych, Jacek | |
dc.contributor.author | Pollmann, Frank | |
dc.contributor.author | Brenig, Wolfram | |
dc.date.accessioned | 2021-12-23T16:19:25Z | - |
dc.date.available | 2021-12-23T16:19:25Z | - |
dc.date.issued | 2016 | |
dc.identifier.issn | 24699950 | |
dc.identifier.uri | https://osnascholar.ub.uni-osnabrueck.de/handle/unios/13141 | - |
dc.description.abstract | We study the frequency dependence of the optical conductivity Re sigma(omega) of the Heisenberg spin-1/2 chain in the thermal and near the transition to the many-body localized phase induced by the strength of a random z-directed magnetic field. Using the method of dynamical quantum typicality, we calculate the real-time dynamics of the spin-current autocorrelation function and obtain the Fourier transform Re sigma(omega) for system sizes much larger than accessible to standard exact-diagonalization approaches. We find that the low-frequency behavior of Re sigma(omega) is well described by Re sigma(omega) approximate to sigma(dc) a|omega|(alpha), with alpha approximate to 1 in a wide range within the thermal phase and close to the transition. We particularly detail the decrease of sigma(dc) in the thermal phase as a function of increasing disorder for strong exchange anisotropies. We further find that the temperature dependence of alpha(dc) is consistent with the existence of a mobility edge. | |
dc.description.sponsorship | EUEuropean Commission [316165]; DFGGerman Research Foundation (DFG)European Commission [SFB 1143]; NSFNational Science Foundation (NSF) [NSF PHY11-25915]; We thank X. Zotos, P. Prelovsek, and F. Heidrich-Meisner for fruitful discussions. J.H. acknowledges support by the EU program FP7-REGPOT-2012-2013-1 under Grant No. 316165. Work of W.B. and F.P. has been supported in part by the DFG through SFB 1143 and the NSF under Grant No. NSF PHY11-25915. W.B. also acknowledges kind hospitality of the PSM, Dresden. R.S. thanks the MPIPKS, Dresden and the CCQCN, Crete for kind hospitality. | |
dc.language.iso | en | |
dc.publisher | AMER PHYSICAL SOC | |
dc.relation.ispartof | PHYSICAL REVIEW B | |
dc.subject | EDGE | |
dc.subject | Materials Science | |
dc.subject | Materials Science, Multidisciplinary | |
dc.subject | Physics | |
dc.subject | Physics, Applied | |
dc.subject | Physics, Condensed Matter | |
dc.subject | QUANTUM | |
dc.subject | SYSTEM | |
dc.title | Typicality approach to the optical conductivity in thermal and many-body localized phases | |
dc.type | journal article | |
dc.identifier.doi | 10.1103/PhysRevB.94.180401 | |
dc.identifier.isi | ISI:000386617400002 | |
dc.description.volume | 94 | |
dc.description.issue | 18 | |
dc.contributor.orcid | 0000-0003-0608-0884 | |
dc.contributor.orcid | 0000-0001-9860-2146 | |
dc.contributor.researcherid | A-5205-2009 | |
dc.contributor.researcherid | L-5378-2013 | |
dc.contributor.researcherid | AAS-6749-2020 | |
dc.identifier.eissn | 24699969 | |
dc.publisher.place | ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA | |
dcterms.isPartOf.abbreviation | Phys. Rev. B | |
dcterms.oaStatus | Green Submitted | |
crisitem.author.dept | FB 04 - Physik | - |
crisitem.author.deptid | fb04 | - |
crisitem.author.orcid | 0000-0003-0608-0884 | - |
crisitem.author.parentorg | Universität Osnabrück | - |
crisitem.author.netid | StRo766 | - |