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Electronic Spectrum of Twisted Graphene Layers under Heterostrain

Loïc Huder, Alexandre Artaud, Toai Le Quang, Guy Trambly de Laissardière, Aloysius G. M. Jansen, Gérard Lapertot, Claude Chapelier, and Vincent T. Renard
Phys. Rev. Lett. 120, 156405 – Published 12 April 2018
Physics logo See Synopsis: Stretching Graphene Localizes its Electrons
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Abstract

We demonstrate that stacking layered materials allows a strain engineering where each layer is strained independently, which we call heterostrain. We combine detailed structural and spectroscopic measurements with tight-binding calculations to show that small uniaxial heterostrain suppresses Dirac cones and leads to the emergence of flat bands in twisted graphene layers (TGLs). Moreover, we demonstrate that heterostrain reconstructs, much more severely, the energy spectrum of TGLs than homostrain for which both layers are strained identically, a result which should apply to virtually all van der Waals structures opening exciting possibilities for straintronics with 2D materials.

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  • Received 8 December 2017
  • Revised 12 February 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.156405

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Synopsis

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Stretching Graphene Localizes its Electrons

Published 12 April 2018

The electrical properties of a graphene bilayer can be tuned by stretching and rotating one of the bilayer’s sheets.

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Authors & Affiliations

Loïc Huder1, Alexandre Artaud1,2, Toai Le Quang1, Guy Trambly de Laissardière3, Aloysius G. M. Jansen1, Gérard Lapertot1, Claude Chapelier1, and Vincent T. Renard1

  • 1Université Grenoble Alpes, CEA, INAC, PHELIQS, F-38000 Grenoble, France
  • 2Université Grenoble Alpes, CNRS, Institut NEEL, F-38000 Grenoble, France
  • 3Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise-CNRS, F-95302 Cergy-Pontoise, France

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Issue

Vol. 120, Iss. 15 — 13 April 2018

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