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Schmitt, Markus ; Kehrein, Stefan

Dynamical quantum phase transitions in the Kitaev honeycomb model

Artikel

Schmitt, Markus und Kehrein, Stefan (2015) Dynamical quantum phase transitions in the Kitaev honeycomb model. Phys. Rev. B 92, 075114.

DOI zum Zitieren dieses Dokuments: 10.5283/epub.81049


Zusammenfassung

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 ...

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.



Beteiligte Einrichtungen


    Details

    DokumentenartArtikel
    Titel eines Journals oder einer ZeitschriftPhys. Rev. B
    VerlagAmerican Physical Society
    Band92
    Seitenbereich075114
    Datum10 August 2015
    Veröffentlichungsdatum28 Okt 2026 10:18
    InstitutionenNicht ausgewählt
    Identifikationsnummer
    WertTyp
    10.1103/PhysRevB.92.075114DOI
    Dewey-Dezimal-Klassifikation500 Naturwissenschaften und Mathematik > 530 Physik
    StatusVeröffentlicht
    BegutachtetJa, diese Version wurde begutachtet
    An der Universität Regensburg entstandenNein
    URN der UB Regensburgurn:nbn:de:bvb:355-epub-810497
    Dokumenten-ID81049

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