Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 36: Many-body Systems: Equilibration, Chaos and Localization II (joint session DY/TT)

TT 36.5: Vortrag

Mittwoch, 18. März 2020, 10:30–10:45, HÜL 186

Real-time dynamics of string breaking in quantum spin chains — •Roberto Verdel1, Fangli Liu2, Seth Whitsitt2, Alexey V. Gorshkov2,3, and Markus Heyl11Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187-Dresden, Germany — 2Joint Quantum Institute, NIST/University of Maryland, College Park, MD 20742, USA — 3Joint Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, MD 20742, USA

String breaking is a central dynamical process in theories featuring confinement, where a string connecting two charges decays at the expense of the creation of new particle-antiparticle pairs. In this talk, we show that this process can also be observed in quantum Ising chains [1], where domain walls get confined either by a symmetry-breaking field or by long-range interactions. Our main finding is that string breaking occurs, in general, as a two-stage process: First, the initial charges remain static and stable; yet, the connecting string can undergo complex dynamics. In the second stage, which can be severely delayed due to dynamical constraints happening in the previous phase, the string finally breaks. We analyse the constrained many-body dynamics of the first stage and its consequences for the final string breaking or the suppression of it.

References: [1] R. Verdel, F. Liu, S. Whitsitt, A. V. Gorshkov, and M. Heyl, (2019), arXiv:1911.11382 [cond-mat.stat-mech].

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