Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Z61: Cooperative Phenomena II
11:30 AM–2:06 PM,
Friday, March 8, 2024
Room: 208AB
Sponsoring
Unit:
GMAG
Chair: Clarina dela Cruz, Oak Ridge National Laboratory
Abstract: Z61.00002 : Protection of spin excitations in Yb quantum magnets*
11:42 AM–11:54 AM
Presenter:
Lazar L Kish
(Brookhaven National Laboratory)
Authors:
Lazar L Kish
(Brookhaven National Laboratory)
Lisuo Wu
(Southern University of Science and Technology)
Leonid Vasylechko
(Lviv Polytechnic National University)
Andrey Podlesnyak
(Oak Ridge National Lab)
Robert M Konik
(Brookhaven National Laboratory)
Daniel M Pajerowski
(Oak Ridge National Lab)
Andreas Weichselbaum
(Brookhaven National Laboratory)
Igor A Zaliznyak
(BROOKHAVEN NATIONAL LABORATORY)
Here we present neutron scattering measurements on quantum magnets YbAlO3 and Yb3O5O12 to evaluate how the protection of 4f electrons might help preserve information in a spin-system despite its coupling to a heat-bath at finite temperature. At low temperatures, we evaluate quantum entanglement witnesses such as quantum Fisher information to establish lower bounds on multipartite entanglement in the system. We then show that the dispersive quasiparticle band-structure can be preserved to temperatures twenty-times greater than the strength of nearest-neighbor couplings in the system, despite an increased thermal population of phonons and crystal-field modes. Analytical calculations and finite-temperature DMRG confirm that the behavior of the spin-system approaches the infinite-temperature limit in the absence of these couplings, allowing us to extract a time-scale of quasiparticle decoherence due to the heat bath.
**This work at the Brookhaven National Laboratory (BNL) was supported by the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, United States Department of Energy (US DOE), under contract no. DE-SC0012704. Work at BNL's Center for Functional Nanomaterials was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US DOE, under the same contract. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.
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