Photoexcitation of graphene with twisted light
We study theoretically the interaction of twisted light with graphene. The light-matter interaction matrix elements between the tight-binding states of electrons in graphene are determined near the Dirac points. We examine the dynamics of the photoexcitation process by posing the equations of motion...
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2013
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346028_v86_n10_p_Farias http://hdl.handle.net/20.500.12110/paper_14346028_v86_n10_p_Farias |
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paper:paper_14346028_v86_n10_p_Farias2023-06-08T16:14:38Z Photoexcitation of graphene with twisted light Atomic orbital Density matrix Inter-band transition Light-matter interactions Orbital angular momentum Photo-excitation process Photoexcited electrons Time evolutions Angular momentum Equations of motion Orbital transfer Photoexcitation Quantum chemistry Graphene We study theoretically the interaction of twisted light with graphene. The light-matter interaction matrix elements between the tight-binding states of electrons in graphene are determined near the Dirac points. We examine the dynamics of the photoexcitation process by posing the equations of motion of the density matrix and working up to second order in the field. The time evolution of the angular momentum of the photoexcited electrons and their associated photocurrents are examined in order to elucidate the mechanisms of angular momentum transfer. We find that the transfer of spin and orbital angular momentum from light to the electrons is more akin here to the case of intraband than of interband transitions in semiconductors, due to the fact that the two relevant energy bands of graphene originate from the same atomic orbitals.© EDP Sciences Società Italiana di Fisica Springer-Verlag 2013. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346028_v86_n10_p_Farias http://hdl.handle.net/20.500.12110/paper_14346028_v86_n10_p_Farias |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Atomic orbital Density matrix Inter-band transition Light-matter interactions Orbital angular momentum Photo-excitation process Photoexcited electrons Time evolutions Angular momentum Equations of motion Orbital transfer Photoexcitation Quantum chemistry Graphene |
| spellingShingle |
Atomic orbital Density matrix Inter-band transition Light-matter interactions Orbital angular momentum Photo-excitation process Photoexcited electrons Time evolutions Angular momentum Equations of motion Orbital transfer Photoexcitation Quantum chemistry Graphene Photoexcitation of graphene with twisted light |
| topic_facet |
Atomic orbital Density matrix Inter-band transition Light-matter interactions Orbital angular momentum Photo-excitation process Photoexcited electrons Time evolutions Angular momentum Equations of motion Orbital transfer Photoexcitation Quantum chemistry Graphene |
| description |
We study theoretically the interaction of twisted light with graphene. The light-matter interaction matrix elements between the tight-binding states of electrons in graphene are determined near the Dirac points. We examine the dynamics of the photoexcitation process by posing the equations of motion of the density matrix and working up to second order in the field. The time evolution of the angular momentum of the photoexcited electrons and their associated photocurrents are examined in order to elucidate the mechanisms of angular momentum transfer. We find that the transfer of spin and orbital angular momentum from light to the electrons is more akin here to the case of intraband than of interband transitions in semiconductors, due to the fact that the two relevant energy bands of graphene originate from the same atomic orbitals.© EDP Sciences Società Italiana di Fisica Springer-Verlag 2013. |
| title |
Photoexcitation of graphene with twisted light |
| title_short |
Photoexcitation of graphene with twisted light |
| title_full |
Photoexcitation of graphene with twisted light |
| title_fullStr |
Photoexcitation of graphene with twisted light |
| title_full_unstemmed |
Photoexcitation of graphene with twisted light |
| title_sort |
photoexcitation of graphene with twisted light |
| publishDate |
2013 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346028_v86_n10_p_Farias http://hdl.handle.net/20.500.12110/paper_14346028_v86_n10_p_Farias |
| _version_ |
1768543290921058304 |