Photoexcitation of graphene with twisted light

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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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Detalles Bibliográficos
Autores principales:	Farías, M.B., Quinteiro, G.F., Tamboreneaa, P.I.
Formato:	JOUR
Materias:	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
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_14346028_v86_n10_p_Farias
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_14346028_v86_n10_p_Farias
record_format	dspace
spelling	todo:paper_14346028_v86_n10_p_Farias2023-10-03T16:14:34Z Photoexcitation of graphene with twisted light Farías, M.B. Quinteiro, G.F. Tamboreneaa, P.I. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Farías, M.B. Quinteiro, G.F. Tamboreneaa, P.I. 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.
format	JOUR
author	Farías, M.B. Quinteiro, G.F. Tamboreneaa, P.I.
author_facet	Farías, M.B. Quinteiro, G.F. Tamboreneaa, P.I.
author_sort	Farías, M.B.
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
url	http://hdl.handle.net/20.500.12110/paper_14346028_v86_n10_p_Farias
work_keys_str_mv	AT fariasmb photoexcitationofgraphenewithtwistedlight AT quinteirogf photoexcitationofgraphenewithtwistedlight AT tamboreneaapi photoexcitationofgraphenewithtwistedlight
_version_	1807319937606221824

Photoexcitation of graphene with twisted light

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