Multi-Center Magnon Excitations Open the Entire Brillouin Zone to
Terahertz Magnetometry of Quantum Magnets
- URL: http://arxiv.org/abs/2203.04343v1
- Date: Tue, 8 Mar 2022 19:04:24 GMT
- Title: Multi-Center Magnon Excitations Open the Entire Brillouin Zone to
Terahertz Magnetometry of Quantum Magnets
- Authors: Tobias Biesner, Seulki Roh, Aleksandar Razpopov, Jannis Willwater,
Stefan S\"ullow, Ying Li, Katharina M. Zoch, Marisa Medarde, J\"urgen Nuss,
Denis Gorbunov, Yurii Skourski, Andrej Pustogow, Stuart E. Brown, Cornelius
Krellner, Roser Valent\'i, Pascal Puphal, Martin Dressel
- Abstract summary: The magnon density of states can be accessed over the entire Brillouin zone through three-center magnon excitations.
The results of THz time-domain experiments agree remarkably well with linear spin-wave theory.
- Score: 42.72559625804617
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Due to the small photon momentum, optical spectroscopy commonly probes
magnetic excitations only at the center of the Brillouin zone; however, there
are ways to override this restriction. In the case of the distorted kagome
quantum magnet Y-kapellasite, Y$_3$Cu$_9$(OH)$_{19}$Cl$_8$, under scrutiny
here, the magnon density of states can be accessed over the entire Brillouin
zone through three-center magnon excitations. This mechanism is aided by the
three different magnetic sublattices and strong short-range correlations in the
distorted kagome lattice. The results of THz time-domain experiments agree
remarkably well with linear spin-wave theory. Relaxing the conventional
zone-center constraint of photons gives a new aspect to probe magnetism in
matter.
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