Speaker
Description
In this work, we show that circular dichroism angle resolved photoemission spectroscopy (CD-ARPES) can map topology in chiral Weyl semimetals PdGa/PtGa, where multifold nodes host large Chern number[1,2]. We successfully simulate the CD intensity using our in-house code dynamics-w90[3]. The correspondence between local OAM and dipole matrix elements depends on orbital characters and experimental geometry. Pd/Pt local OAM can be measured by CD, where d orbital contribution is dominated by m=∓2 complex orbitals. Although the total CD signal consists of interatomic interference terms, they still exhibit radial structure. We conclude that one can see the reminiscence of radial OAM structure, which comes from the topological nature of the Weyl nodes.
| Theoretical Work | Theory |
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