Abstract:
:The circular photogalvanic effect (CPGE) is the part of a photocurrent that switches depending on the sense of circular polarization of the incident light. It has been consistently observed in systems without inversion symmetry and depends on non-universal material details. Here we find that in a class of Weyl semimetals (for example, SrSi2) and three-dimensional Rashba materials (for example, doped Te) without inversion and mirror symmetries, the injection contribution to the CPGE trace is effectively quantized in terms of the fundamental constants e, h, c and with no material-dependent parameters. This is so because the CPGE directly measures the topological charge of Weyl points, and non-quantized corrections from disorder and additional bands can be small over a significant range of incident frequencies. Moreover, the magnitude of the CPGE induced by a Weyl node is relatively large, which enables the direct detection of the monopole charge with current techniques.
journal_name
Nat Communjournal_title
Nature communicationsauthors
de Juan F,Grushin AG,Morimoto T,Moore JEdoi
10.1038/ncomms15995subject
Has Abstractpub_date
2017-07-06 00:00:00pages
15995issn
2041-1723pii
ncomms15995journal_volume
8pub_type
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