Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F64: Correlated Electron Magnetism
8:00 AM–10:48 AM,
Tuesday, March 15, 2022
Room: Hyatt Regency Hotel -Grant Park B
Sponsoring
Unit:
DCMP
Chair: Trinanjan Datta, Augusta University
Abstract: F64.00005 : A Schwinger Boson Theory for the Magnetic Excitations of Ba3CoSb2O9
8:48 AM–9:00 AM
Presenter:
Esteban A Ghioldi
(University of Tennessee)
Authors:
Esteban A Ghioldi
(University of Tennessee)
Shang-Shun Zhang
(School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA)
Yoshitomo Kamiya
(Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education),Shenyang National Laboratory for Materials Science, School of Physics and Astronomy,Shangha)
Luis O Manuel
(Instituto de Física Rosario (CONICET) and Universidad Nacional de Rosario, Brd 27 de Febrero 210 bis, (2000) Rosario, Argentina.)
Adolfo E Trumper
(Instituto de Física Rosario (CONICET) and Universidad Nacional de Rosario, Brd 27 de Febrero 210 bis, (2000) Rosario, Argentina.)
Cristian Batista
(University of Tennessee)
The spin 1/2 triangular lattice Heisenberg Hamiltonian is a prototypical model for studying the enhancement of quantum fluctuations induced by geometric frustration. P. W. Anderson proposed this model to introduce the resonance valence bond ground state that led to the concept of quantum spin liquids. While later theoretical studies demonstrated that the ground state exhibits 120º long range magnetic ordering, recent inelastic neutron scattering experiments on the triangular antiferromagnet Ba3CoSb2O9 have revealed strong deviations from the dynamical spin structure factor predicted by a semi-classical theory, such as a strong downward renormalization of the low-energy dispersion, and a strong high-energy dispersive continuum. In this talk, I will show that the low-energy part of the spectrum (including the low-energy continuum) is reproduced to a very good approximation by a Schwinger-boson theory that includes corrections beyond the saddle-point approximation.
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