Broken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance

The cyclotron resonance of monolayer graphene, encapsulated in hexagonal boron nitride and with a graphite backgate, is explored via infrared transmission magnetospectroscopy as a function of the filling factor at fixed magnetic fields. The impact of many-particle interactions in the regime of broke...

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Autores principales:	Jordan Pack, B. Jordan Russell, Yashika Kapoor, Jesse Balgley, Jeffrey Ahlers, Takashi Taniguchi, Kenji Watanabe, Erik A. Henriksen
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/ac70d0dc967448c78a8846a32ffe0f48
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spelling	oai:doaj.org-article:ac70d0dc967448c78a8846a32ffe0f482021-12-02T12:25:33ZBroken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance10.1103/PhysRevX.10.0410062160-3308https://doaj.org/article/ac70d0dc967448c78a8846a32ffe0f482020-10-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.041006http://doi.org/10.1103/PhysRevX.10.041006https://doaj.org/toc/2160-3308The cyclotron resonance of monolayer graphene, encapsulated in hexagonal boron nitride and with a graphite backgate, is explored via infrared transmission magnetospectroscopy as a function of the filling factor at fixed magnetic fields. The impact of many-particle interactions in the regime of broken spin and valley symmetries is observed spectroscopically. As the occupancy of the zeroth Landau level is increased from half-filling, a nonmonotonic progression of multiple cyclotron resonance peaks is seen for several interband transitions, revealing the evolution of underlying many-particle-enhanced gaps. Analysis of the peak energies shows significant exchange enhancements of spin gaps both at and below the Fermi energy, a strong filling-factor dependence of the substrate-induced Dirac mass, and also the smallest particle-hole asymmetry reported to date in graphene cyclotron resonance.Jordan PackB. Jordan RussellYashika KapoorJesse BalgleyJeffrey AhlersTakashi TaniguchiKenji WatanabeErik A. HenriksenAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 4, p 041006 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Jordan Pack B. Jordan Russell Yashika Kapoor Jesse Balgley Jeffrey Ahlers Takashi Taniguchi Kenji Watanabe Erik A. Henriksen Broken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance
description	The cyclotron resonance of monolayer graphene, encapsulated in hexagonal boron nitride and with a graphite backgate, is explored via infrared transmission magnetospectroscopy as a function of the filling factor at fixed magnetic fields. The impact of many-particle interactions in the regime of broken spin and valley symmetries is observed spectroscopically. As the occupancy of the zeroth Landau level is increased from half-filling, a nonmonotonic progression of multiple cyclotron resonance peaks is seen for several interband transitions, revealing the evolution of underlying many-particle-enhanced gaps. Analysis of the peak energies shows significant exchange enhancements of spin gaps both at and below the Fermi energy, a strong filling-factor dependence of the substrate-induced Dirac mass, and also the smallest particle-hole asymmetry reported to date in graphene cyclotron resonance.
format	article
author	Jordan Pack B. Jordan Russell Yashika Kapoor Jesse Balgley Jeffrey Ahlers Takashi Taniguchi Kenji Watanabe Erik A. Henriksen
author_facet	Jordan Pack B. Jordan Russell Yashika Kapoor Jesse Balgley Jeffrey Ahlers Takashi Taniguchi Kenji Watanabe Erik A. Henriksen
author_sort	Jordan Pack
title	Broken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance
title_short	Broken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance
title_full	Broken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance
title_fullStr	Broken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance
title_full_unstemmed	Broken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance
title_sort	broken symmetries and kohn’s theorem in graphene cyclotron resonance
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/ac70d0dc967448c78a8846a32ffe0f48
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Broken Symmetries and Kohn’s Theorem in Graphene Cyclotron Resonance

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