Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session M50: Non-Equilibrium Dynamics
11:15 AM–2:15 PM,
Wednesday, March 4, 2020
Room: Mile High Ballroom 1C
Sponsoring
Unit:
DCMP
Chair: Alexander Kemper, North Carolina State University
Abstract: M50.00012 : Long-lived coherent states in photo-excited NiO
Presenter:
Denis Golez
(Simons Foundation)
Authors:
Denis Golez
(Simons Foundation)
Konrad Gillmeister
(Department of physics, Institute of Physics Martin-Luther-Universitat Halle-Wittenberg)
Nikolaj Bittner
(Department of Physics, University of Fribourg)
Yaroslav Pavlyukh
(Technische Universitat Kaiserslautern, Department of Physics)
Cheng-Tien Chiang
(Department of physics, Institute of Physics Martin-Luther-Universitat Halle-Wittenberg)
Philipp Werner
(Department of Physics, University of Fribourg)
Wolf Widdra
(Department of physics, Institute of Physics Martin-Luther-Universitat Halle-Wittenberg)
We will present a combined experimental and theoretical study of the ultrafast dynamics in strongly correlated photo-excited NiO [1]. By combining time-resolved two-photon photoemission experiments and the non-equilibrium extension of dynamical mean-field theory we revealed an ultrafast electronic relaxation (<10 fs) and related photo-induced in-gap states connected with the Hund excitations. Remarkably, the weight of these in-gap states displays long-lived coherent THz oscillations up to 2 ps. The frequency of these oscillations corresponds to the strength of the antiferromagnetic superexchange interaction in NiO and their lifetime vanishes as the Neel temperature is approached. Numerical simulations of a two-band t-J model reveal that the THz oscillations originate from the interplay between local many-body excitations and long-range antiferromagnetic order.
[1] K. Gillmeister, D.Golez, C. Chiang, N. Bittner, P. Werner, Y. Pavlyukh, J. Berakdar, and W. Widdra, arXiv:1909.00828 (2019).
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