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Floquet Weyl Magnons in Three-Dimensional Quantum Magnets
1Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, Ontario, N2L 2Y5, Canada. sowerre@perimeterinstitute.ca.
Scientific Reports
|July 6, 2018
Summary
Researchers demonstrate a new method to create magnonic Weyl points (WPs) in 3D quantum magnets using light, overcoming limitations of intrinsic magnetic interactions for experimental observation.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Topological Materials
Background:
- Magnonic Weyl points (WPs) are theoretical constructs in 3D quantum magnets, requiring broken time-reversal symmetry for their existence.
- Experimental observation of magnonic WPs is challenging due to the weak nature of intrinsic symmetry-breaking interactions in known materials.
- Existing 3D quantum magnets suitable for hosting magnonic WPs are scarce, hindering experimental verification.
Purpose of the Study:
- To propose an alternative method for generating magnonic Weyl points (WPs) in 3D quantum magnets.
- To investigate the emergence of magnonic WPs without relying on intrinsic perturbative interactions.
- To develop a general theoretical framework for magnonic Floquet Weyl points (FWPs) in periodically driven systems.
Main Methods:
- Development of the magnonic Floquet-Bloch theory for periodically driven 3D quantum magnets.
- Theoretical analysis of 3D magnonic Dirac nodal-line (DNL) and gapped trivial insulators under periodic driving.
- Investigation of magnon dispersions, Berry curvatures, and anomalous thermal Hall effect to confirm FWPs.
Main Results:
- Periodic photo-irradiation can induce magnonic Weyl points (WPs) in 3D quantum magnets, bypassing the need for intrinsic symmetry breaking.
- The study introduces magnonic Floquet Weyl points (FWPs) in periodically driven 3D magnonic Dirac nodal-line and trivial insulator systems.
- The emergence and tunability of FWPs by circularly-polarized light are demonstrated through theoretical calculations and transport signatures.
Conclusions:
- Photo-irradiation offers a viable route to realize magnonic Weyl points (WPs) in 3D quantum magnets.
- The developed magnonic Floquet-Bloch theory provides a general framework applicable to various magnetic insulators.
- This work extends the concept of magnonic WPs to a broader range of 3D magnetically ordered systems, paving the way for experimental exploration.
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