Dominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems

Abstract We show that the standard concepts of nonlinear response to electromagnetic fields break down in two-dimensional Dirac systems, like graphene, in the quantum regime close to the Dirac point. We present a compelling many-body theory for nonlinear transport focusing on disorder scattering as...

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Autores principales:	Habib Rostami, Emmanuele Cappelluti
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/aef60b56967747a195245af319379d58
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spelling	oai:doaj.org-article:aef60b56967747a195245af319379d582021-12-02T17:15:58ZDominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems10.1038/s41699-021-00217-02397-7132https://doaj.org/article/aef60b56967747a195245af319379d582021-05-01T00:00:00Zhttps://doi.org/10.1038/s41699-021-00217-0https://doaj.org/toc/2397-7132Abstract We show that the standard concepts of nonlinear response to electromagnetic fields break down in two-dimensional Dirac systems, like graphene, in the quantum regime close to the Dirac point. We present a compelling many-body theory for nonlinear transport focusing on disorder scattering as a benchmark example. We show that, although the diamagnetic two-photon vertex is absent at the non-interacting level, disorder effects give rise to a self-generation of such two-photon vertex surviving even in the clean limit. We predict that the two-photon vertex self-generation is present only in two dimensions. The impact of such a striking scenario on the nonlinear quantum transport is discussed, predicting a huge enhancement of third-order dc conductivity comparing to the common models.Habib RostamiEmmanuele CappellutiNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENnpj 2D Materials and Applications, Vol 5, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999 Habib Rostami Emmanuele Cappelluti Dominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems
description	Abstract We show that the standard concepts of nonlinear response to electromagnetic fields break down in two-dimensional Dirac systems, like graphene, in the quantum regime close to the Dirac point. We present a compelling many-body theory for nonlinear transport focusing on disorder scattering as a benchmark example. We show that, although the diamagnetic two-photon vertex is absent at the non-interacting level, disorder effects give rise to a self-generation of such two-photon vertex surviving even in the clean limit. We predict that the two-photon vertex self-generation is present only in two dimensions. The impact of such a striking scenario on the nonlinear quantum transport is discussed, predicting a huge enhancement of third-order dc conductivity comparing to the common models.
format	article
author	Habib Rostami Emmanuele Cappelluti
author_facet	Habib Rostami Emmanuele Cappelluti
author_sort	Habib Rostami
title	Dominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems
title_short	Dominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems
title_full	Dominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems
title_fullStr	Dominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems
title_full_unstemmed	Dominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems
title_sort	dominant role of two-photon vertex in nonlinear response in two-dimensional dirac systems
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/aef60b56967747a195245af319379d58
work_keys_str_mv	AT habibrostami dominantroleoftwophotonvertexinnonlinearresponseintwodimensionaldiracsystems AT emmanuelecappelluti dominantroleoftwophotonvertexinnonlinearresponseintwodimensionaldiracsystems
_version_	1718381221059231744

Dominant role of two-photon vertex in nonlinear response in two-dimensional Dirac systems

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