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Multiple fermion scattering in the weakly coupled spin-chain compound YbAlO3

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Nikitin,  S. E.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sukhanov,  A. S.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Brando,  M.
Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Nikitin, S. E., Nishimoto, S., Fan, Y., Wu, J., Wu, L., Sukhanov, A. S., et al. (2021). Multiple fermion scattering in the weakly coupled spin-chain compound YbAlO3. Nature Communications, 12: 3599, pp. 1-7. doi:10.1038/s41467-021-23585-z.


Cite as: http://hdl.handle.net/21.11116/0000-0008-E99B-3
Abstract
The Heisenberg antiferromagnetic spin-1/2 chain, originally introduced almost a century ago, is one of the best studied models in quantum mechanics due to its exact solution, but nevertheless it continues to present new discoveries. Its low-energy physics is described by the Tomonaga-Luttinger liquid of spinless fermions, similar to the conduction electrons in one-dimensional metals. In this work we investigate the Heisenberg spin-chain compound YbAlO3 and show that the weak interchain coupling causes Umklapp scattering between the left- and right-moving fermions and stabilizes an incommensurate spin-density wave order at q = 2kF under finite magnetic fields. These Umklapp processes open a route to multiple coherent scattering of fermions, which results in the formation of satellites at integer multiples of the incommensurate fundamental wavevector Q = nq. Our work provides surprising and profound insight into bandstructure control for emergent fermions in quantum materials, and shows how neutron diffraction can be applied to investigate the phenomenon of coherent multiple scattering in metals through the proxy of quantum magnetic systems. © 2021, The Author(s).