Cargando…
Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi
Weyl semimetals are crystals in which electron bands cross at isolated points in momentum space. Associated with each crossing point (or Weyl node) is a topological invariant known as the Berry monopole charge. The circular photogalvanic effect (CPGE), whereby circular polarized light generates a he...
Autores principales: | , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7439497/ https://www.ncbi.nlm.nih.gov/pubmed/32832618 http://dx.doi.org/10.1126/sciadv.aba0509 |
_version_ | 1783572995660316672 |
---|---|
author | Rees, Dylan Manna, Kaustuv Lu, Baozhu Morimoto, Takahiro Borrmann, Horst Felser, Claudia Moore, J. E. Torchinsky, Darius H. Orenstein, J. |
author_facet | Rees, Dylan Manna, Kaustuv Lu, Baozhu Morimoto, Takahiro Borrmann, Horst Felser, Claudia Moore, J. E. Torchinsky, Darius H. Orenstein, J. |
author_sort | Rees, Dylan |
collection | PubMed |
description | Weyl semimetals are crystals in which electron bands cross at isolated points in momentum space. Associated with each crossing point (or Weyl node) is a topological invariant known as the Berry monopole charge. The circular photogalvanic effect (CPGE), whereby circular polarized light generates a helicity-dependent photocurrent, is a notable example of a macroscopic property that emerges directly from the topology of the Weyl semimetal band structure. Recently, it was predicted that the amplitude of the CPGE associated with optical transitions near a Weyl node is proportional to its monopole charge. In chiral Weyl systems, nodes of opposite charge are nondegenerate, opening a window of wavelengths where the CPGE resulting from uncompensated Berry charge can emerge. Here, we report measurements of CPGE in the chiral Weyl semimetal RhSi, revealing a CPGE response in an energy window that closes at 0.65 eV, in agreement with the predictions of density functional theory. |
format | Online Article Text |
id | pubmed-7439497 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-74394972020-08-20 Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi Rees, Dylan Manna, Kaustuv Lu, Baozhu Morimoto, Takahiro Borrmann, Horst Felser, Claudia Moore, J. E. Torchinsky, Darius H. Orenstein, J. Sci Adv Research Articles Weyl semimetals are crystals in which electron bands cross at isolated points in momentum space. Associated with each crossing point (or Weyl node) is a topological invariant known as the Berry monopole charge. The circular photogalvanic effect (CPGE), whereby circular polarized light generates a helicity-dependent photocurrent, is a notable example of a macroscopic property that emerges directly from the topology of the Weyl semimetal band structure. Recently, it was predicted that the amplitude of the CPGE associated with optical transitions near a Weyl node is proportional to its monopole charge. In chiral Weyl systems, nodes of opposite charge are nondegenerate, opening a window of wavelengths where the CPGE resulting from uncompensated Berry charge can emerge. Here, we report measurements of CPGE in the chiral Weyl semimetal RhSi, revealing a CPGE response in an energy window that closes at 0.65 eV, in agreement with the predictions of density functional theory. American Association for the Advancement of Science 2020-07-15 /pmc/articles/PMC7439497/ /pubmed/32832618 http://dx.doi.org/10.1126/sciadv.aba0509 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/ https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Rees, Dylan Manna, Kaustuv Lu, Baozhu Morimoto, Takahiro Borrmann, Horst Felser, Claudia Moore, J. E. Torchinsky, Darius H. Orenstein, J. Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi |
title | Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi |
title_full | Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi |
title_fullStr | Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi |
title_full_unstemmed | Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi |
title_short | Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi |
title_sort | helicity-dependent photocurrents in the chiral weyl semimetal rhsi |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7439497/ https://www.ncbi.nlm.nih.gov/pubmed/32832618 http://dx.doi.org/10.1126/sciadv.aba0509 |
work_keys_str_mv | AT reesdylan helicitydependentphotocurrentsinthechiralweylsemimetalrhsi AT mannakaustuv helicitydependentphotocurrentsinthechiralweylsemimetalrhsi AT lubaozhu helicitydependentphotocurrentsinthechiralweylsemimetalrhsi AT morimototakahiro helicitydependentphotocurrentsinthechiralweylsemimetalrhsi AT borrmannhorst helicitydependentphotocurrentsinthechiralweylsemimetalrhsi AT felserclaudia helicitydependentphotocurrentsinthechiralweylsemimetalrhsi AT mooreje helicitydependentphotocurrentsinthechiralweylsemimetalrhsi AT torchinskydariush helicitydependentphotocurrentsinthechiralweylsemimetalrhsi AT orensteinj helicitydependentphotocurrentsinthechiralweylsemimetalrhsi |