Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet

Seung-Hwan Do (), Hao Zhang, Travis J. Williams, Tao Hong, V. Ovidiu Garlea, J. A. Rodriguez-Rivera, Tae-Hwan Jang, Sang-Wook Cheong, Jae-Hoon Park, Cristian D. Batista and Andrew D. Christianson
Additional contact information
Seung-Hwan Do: Materials Science and Technology Division, Oak Ridge National Laboratory
Hao Zhang: Materials Science and Technology Division, Oak Ridge National Laboratory
Travis J. Williams: Neutron Scattering Division, Oak Ridge National Laboratory
Tao Hong: Neutron Scattering Division, Oak Ridge National Laboratory
V. Ovidiu Garlea: Neutron Scattering Division, Oak Ridge National Laboratory
J. A. Rodriguez-Rivera: University of Maryland
Tae-Hwan Jang: MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative
Sang-Wook Cheong: MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative
Jae-Hoon Park: MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative
Cristian D. Batista: University of Tennessee
Andrew D. Christianson: Materials Science and Technology Division, Oak Ridge National Laboratory

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract An ongoing challenge in the study of quantum materials, is to reveal and explain collective quantum effects in spin systems where interactions between different modes types are important. Here we approach this problem through a combined experimental and theoretical study of interacting transverse and longitudinal modes in an easy-plane quantum magnet near a continuous quantum phase transition. Our inelastic neutron scattering measurements of Ba2FeSi2O7 reveal the emergence, decay, and renormalization of a longitudinal mode throughout the Brillouin zone. The decay of the longitudinal mode is particularly pronounced at the zone center. To account for the many-body effects of the interacting low-energy modes in anisotropic magnets, we generalize the standard spin-wave theory. The measured mode decay and renormalization is reproduced by including all one-loop corrections. The theoretical framework developed here is broadly applicable to quantum magnets with more than one type of low energy mode.

Date: 2021
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DOI: 10.1038/s41467-021-25591-7

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