Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 43: Correlated Electrons: Other Theoretical Topics

TT 43.9: Talk

Thursday, March 20, 2025, 11:45–12:00, H33

Mapping out Localization Phases in Bond-Disordered XXZ Models — Adrian Braemer¹, •Javad Vahedi², and Martin Gärttner² — ¹Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — ²Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany

Historically, the phenomenon of many-body localization (MBL) has been studied in spin systems subject to random, local magnetic fields. At strong disorder, the system is found to be localized, with the local integrals of motion (LIOMs) consisting of single spins. However, this is not the only type of MBL: in bond-disordered Heisenberg models, the LIOMs have been shown to involve pairs of spins.

In this talk, we show that the bond-disordered XXZ model also exhibits a single-spin localized phase at strong anisotropy and map out the transitions between these three phases. To this end, we generalize the notion of occupation distance introduced by Hopjan et al. [1] to different observables, enabling us to characterize all three phases.

[1] Phys. Rev. B 104, 235112 (2021).

Keywords: MBL; Bond-Disordered; XXZ spin chains