Condensed Matter

    

Neutron-Scattering Determination of Phonon Wave Function and Topological Invariant in Transition-Metal Monosilicides

Authors: Zhendong Jin, Biaoyan Hu, Yiran Liu

In close analogy to electronic semimetals, a variety of Weyl, Dirac points and nodal lines are predicted for phonons recently by ab initio calculations, but very few experimental confirmations have been made. We performed Inelastic Neutron Scattering (INS) experiments on MnSi and CoSi crystals, and identified multiple types of unconventional Weyl and Dirac points in their Brillioun zones. Being aware of neutron scattering's capability of wavefunction detection and polarization determination, we further derived an explicit relation between the topological invariant of a Weyl node and the INS intensity patterns nearby. Apart from protected surface states and novel transport phenomena, our work suggests that topological nodes also leave some observable traces in spectroscopic patterns.

Comments: 6 Pages.

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[v1] 2020-12-04 08:34:13

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