Anomalous Neutron Nuclear-Magnetic Interference Spectroscopy
arxiv(2024)
摘要
The electron-phonon interaction plays a critical role in materials
electrical, thermal, optical, and superconducting properties. However,
measuring the phonon mode-resolved electron-phonon interaction has been
challenging. Here we propose neutron-scattering-based Anomalous Neutron
nUclear-Magnetic Interference Spectroscopy (ANUBIS), where the co-existence of
neutron nuclear scattering and magnetic scattering leads to anomalous dynamical
structure factor under the presence of the electron-phonon interaction. Such
anomalous structure factor is linear in electron-phonon coupling constant at
the phonon wavevector, and is directly proportional to the momentum and
energy-resolved dielectric function. The experimental configuration can be
achieved using existing polarized inelastic neutron scattering setup, and an
order-of-magnitude estimate shows the viability to observe the anomalous
scattering signal is around 10^-4 to 10^-3 relative to phonon
scattering, which is achievable at emerging neutron facilities. Our proposal
offers an alternative neutron-based metrology to probe the crucial electronic
properties.
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