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Emergent Dispersive Multipolar Excitations in NaErSe_{2}.
Zheng Zhang1, Mingfang Shu2,3, Mingtai Xie1,4
1Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China.
Researchers discovered coupled excitations in NaErSe2, where local and collective behaviors merge. This finding in a triangular antiferromagnet reveals new possibilities for tunable multipolar excitations.
Area of Science:
- Condensed matter physics
- Quantum magnetism
Background:
- Local and collective excitations typically remain decoupled in condensed matter systems due to energy scale differences.
- Frustrated magnets offer unique platforms for exploring exotic magnetic phenomena.
Purpose of the Study:
- To identify and characterize coupled local-collective excitations in the triangular antiferromagnet NaErSe2.
- To investigate the role of spin-orbit coupling in mediating these excitations.
- To explore the field-tunability of multipolar excitations in this material.
Main Methods:
- Neutron spectroscopy was employed to probe the magnetic excitations.
- Total angular momentum modeling was used to interpret the experimental data.
- The effect of an applied magnetic field on the excitation spectra was studied.
Main Results:
- Coupled local-collective excitations were identified, featuring a distinct multipolar band formed by the interaction between ground state magnons and excited states.
- The low-lying crystalline electric field (CEF) states exhibit dipolar and dipole-octupole characters.
- An applied magnetic field induces a transition to a multipolar ferromagnetic state, altering the excitation spectra.
Conclusions:
- Strong spin-orbit coupling drives the emergent coupling between local and collective excitations in NaErSe2.
- NaErSe2 serves as a promising platform for studying field-tunable multipolar excitations in frustrated magnetic systems.
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