IPB

Prof. Zlatko Papić

20. April 2022.

You are cordially invited to the SCL seminar of the Center for the Study of Complex Systems, which will be held on Thursday, 13 September 2018 at 14:00 in the library reading room “Dr. Dragan Popović” of the Institute of Physics Belgrade. The talk entitled:

Quantum many-body scars

will be given by Prof. Dr. Zlatko Papić (School of Physics and Astronomy, University of Leeds, UK). Abstract of the talk:

Recent experiments on large chains of Rydberg atoms [H. Bernien et al., Nature 551, 579 (2017)] have demonstrated the possibility of realizing 1D systems with locally constrained Hilbert spaces, along with some surprising signatures of non-ergodic dynamics, such as persistent oscillations following a quench from the Neel product state. In this talk we will argue that this phenomenon is a manifestation of a “quantum many-body scar”, i.e., a concentration of extensively many eigenstates of the system around special many-body states [1]. The special states are analogs of unstable classical periodic orbits in the single-particle quantum scars. We will present a model based on a single particle hopping on the Hilbert space graph, which quantitatively captures the scarred wave functions up to large systems of 32 atoms. These results suggest that scarred many-body bands give rise to a new universality class of quantum dynamics, which opens up opportunities for creating and manipulating novel states with long-lived coherence in systems that are now amenable to experimental study.

[1] C. J. Turner, A. A. Michailidis, D. A. Abanin, M. Serbyn, Z. Papić, Nat. Phys, 14, 745 (2018).