Kehrein, Stefan K.

[["dc.bibliographiccitation.artnumber","50001"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","EPL (Europhysics Letters)"],["dc.bibliographiccitation.volume","115"],["dc.contributor.author","Schmitt, Markus"],["dc.contributor.author","Kehrein, Stefan"],["dc.date.accessioned","2018-11-07T10:08:57Z"],["dc.date.available","2018-11-07T10:08:57Z"],["dc.date.issued","2016"],["dc.description.abstract","The question of thermalisation in closed quantum many-body systems has received a lot of attention in the past few years. An intimately related question is whether a closed quantum system shows irreversible dynamics. However, irreversibility and what we actually mean by this in a quantum many-body system with unitary dynamics has been explored very little. In this work we investigate the dynamics of the Ising model in a transverse magnetic field involving an imperfect effective time reversal. We propose a definition of irreversibility based on the echo peak decay of observables. Inducing the effective time reversal by different protocols we find an algebraic decay of the echo peak heights or an ever persisting echo peak indicating that the dynamics in this model is well reversible. Copyright (C) EPLA, 2016"],["dc.identifier.doi","10.1209/0295-5075/115/50001"],["dc.identifier.isi","000388368800001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39573"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Epl Association, European Physical Society"],["dc.relation.issn","1286-4854"],["dc.relation.issn","0295-5075"],["dc.title","Effective time reversal and echo dynamics in the transverse field Ising model"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","22"],["dc.bibliographiccitation.journal","Physical Review B"],["dc.bibliographiccitation.volume","100"],["dc.contributor.author","Schnaack, Oskar"],["dc.contributor.author","Bölter, Niklas"],["dc.contributor.author","Paeckel, Sebastian"],["dc.contributor.author","Manmana, Salvatore R."],["dc.contributor.author","Kehrein, Stefan"],["dc.contributor.author","Schmitt, Markus"],["dc.date.accessioned","2020-12-10T18:20:22Z"],["dc.date.available","2020-12-10T18:20:22Z"],["dc.date.issued","2019"],["dc.identifier.arxiv","1808.05646"],["dc.identifier.doi","10.1103/PhysRevB.100.224302"],["dc.identifier.eissn","2469-9969"],["dc.identifier.issn","2469-9950"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75540"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B03 Relaxation, Thermalisierung, Transport und Kondensation in hochangeregten Festkörpern"],["dc.title","Tripartite information, scrambling, and the role of Hilbert space partitioning in quantum lattice models"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Physical Review B"],["dc.bibliographiccitation.volume","99"],["dc.contributor.author","Schmitt, Markus"],["dc.contributor.author","Sels, Dries"],["dc.contributor.author","Kehrein, Stefan"],["dc.contributor.author","Polkovnikov, Anatoli"],["dc.date.accessioned","2020-12-10T18:25:08Z"],["dc.date.available","2020-12-10T18:25:08Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1103/PhysRevB.99.134301"],["dc.identifier.eissn","2469-9969"],["dc.identifier.issn","2469-9950"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75590"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B03 Relaxation, Thermalisierung, Transport und Kondensation in hochangeregten Festkörpern"],["dc.title","Semiclassical echo dynamics in the Sachdev-Ye-Kitaev model"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","18"],["dc.bibliographiccitation.journal","Physical Review B"],["dc.bibliographiccitation.volume","98"],["dc.contributor.author","Schmitt, Markus"],["dc.contributor.author","Kehrein, Stefan"],["dc.date.accessioned","2020-12-10T18:25:08Z"],["dc.date.available","2020-12-10T18:25:08Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1103/PhysRevB.98.180301"],["dc.identifier.eissn","2469-9969"],["dc.identifier.issn","2469-9950"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75584"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B03 Relaxation, Thermalisierung, Transport und Kondensation in hochangeregten Festkörpern"],["dc.title","Irreversible dynamics in quantum many-body systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","085134"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Physical Review B"],["dc.bibliographiccitation.volume","93"],["dc.contributor.author","Wang, Pei"],["dc.contributor.author","Schmitt, Markus"],["dc.contributor.author","Kehrein, Stefan"],["dc.date.accessioned","2020-12-10T18:20:24Z"],["dc.date.available","2020-12-10T18:20:24Z"],["dc.date.issued","2016"],["dc.description.abstract","We study the Hall conductance of a Chern insulator after a global quench of the Hamiltonian. The Hall conductance in the long time limit is obtained by applying the linear response theory to the diagonal ensemble. It is expressed as the integral of the Berry curvature weighted by the occupation number over the Brillouin zone. We identify a topologically driven nonequilibrium phase transition, which is indicated by the nonanalyticity of the Hall conductance as a function of the energy gap m(f) in the post-quench Hamiltonian (H) over cap (f). The topological invariant for the quenched state is the winding number of the Green's function W, which equals the Chern number for the ground state of (H) over cap (f). In the limit m(f) -> 0, the derivative of the Hall conductance with respect to m(f) is proportional to ln vertical bar m(f)vertical bar, with the constant of proportionality being the ratio of the change of W at m(f) = 0 to the energy gap in the initial state. This nonanalytic behavior is universal in two-band Chern insulators such as the Dirac model, the Haldane model, or the Kitaev honeycomb model in the fermionic basis."],["dc.identifier.doi","10.1103/PhysRevB.93.085134"],["dc.identifier.eissn","2469-9969"],["dc.identifier.isi","000370797400002"],["dc.identifier.issn","2469-9950"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75548"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","2469-9969"],["dc.relation.issn","2469-9950"],["dc.title","Universal nonanalytic behavior of the Hall conductance in a Chern insulator at the topologically driven nonequilibrium phase transition"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","075114"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Physical Review. B"],["dc.bibliographiccitation.volume","92"],["dc.contributor.author","Schmitt, Markus"],["dc.contributor.author","Kehrein, Stefan"],["dc.date.accessioned","2018-11-07T09:53:20Z"],["dc.date.available","2018-11-07T09:53:20Z"],["dc.date.issued","2015"],["dc.description.abstract","The notion of a dynamical quantum phase transition (DQPT) was recently introduced [Heyl et al., Phys. Rev. Lett. 110, 135704 (2013)] as the nonanalytic behavior of the Loschmidt echo at critical times in the thermodynamic limit. In this work the quench dynamics in the ground state sector of the two-dimensional Kitaev honeycomb model is studied regarding the occurrence of DQPTs. For general two-dimensional systems of BCS type it is demonstrated how the zeros of the Loschmidt echo coalesce to areas in the thermodynamic limit, implying that DQPTs occur as discontinuities in the second derivative. In the Kitaev honeycomb model DQPTs appear after quenches across a phase boundary or within the massless phase. In the 1d limit of the Kitaev honeycomb model it becomes clear that the discontinuity in the higher derivative is intimately related to the higher dimensionality of the nondegenerate model. Moreover, there is a strong connection between the stationary value of the rate function of the Loschmidt echo after long times and the occurrence of DQPTs in this model."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) (project B03) [SFB 1073]"],["dc.identifier.doi","10.1103/PhysRevB.92.075114"],["dc.identifier.isi","000359344100001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36309"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B03 Relaxation, Thermalisierung, Transport und Kondensation in hochangeregten Festkörpern"],["dc.relation.issn","1550-235X"],["dc.relation.issn","1098-0121"],["dc.title","Dynamical quantum phase transitions in the Kitaev honeycomb model"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]