Strained-induced Landau levels in momentum space

ORAL

Abstract

It is well known that certain strain patterns in graphene couple to the low-energy Dirac fermions as pseudo-magnetic fields -- i.e. magnetic fields that preserve time-reversal symmetry. This can lead to the formation of quantized Landau levels in the absence of magnetic fields, as first predicted by [Guinea et al., Nat. Phys. 6, 30 (2010)] and subsequently identified in local STM measurements [Levy et al., Science 329, 544 (2010)]. Here we extend this body of work by considering momentum-resolved signatures of large-scale, strain-induced pseudo-magnetic fields in graphene. Our theoretical modeling supports the first observation of Landau levels in ARPES. The corresponding pseudo-magnetic field of 41 T is attributed to strain generated by shallow triangular nanoprisms on our SiC substrates, over which graphene grows without grain boundaries, as revealed by AFM and STM measurements. Our work demonstrates the feasibility of generating strain-induced quantum phases in 2D Dirac materials on a wafer-scale size.

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Presenters

  • Étienne Lantagne-Hurtubise

    University of British Columbia

Authors

  • Étienne Lantagne-Hurtubise

    University of British Columbia

  • Pascal Nigge

    University of British Columbia, Department of Physics & Astronomy, University of British Columbia

  • Amy Qu

    University of British Columbia, Stewart Blusson Quantum Matter Institute, University of British Columbia

  • Erik Mårsell

    University of British Columbia

  • Stefan Link

    Max Planck Institute for Solid State Research

  • Gary Tom

    University of British Columbia

  • Christopher Gutierrez

    University of British Columbia, National Institute of Standards and Technology

  • Ulrich Starke

    Max Planck Institute for Solid State Research

  • Douglas Andrew Bonn

    University of British Columbia, Stuart Blussom Quantum Matter Institute, University of British Columbia, Univ of British Columbia

  • Sarah A. Burke

    Department of Physics and Astronomy, University of British Columbia, University of British Columbia, Stewart Blusson Quantum Matter Institute, University of British Columbia

  • Andrea Damascelli

    University of British Columbia, University of British Colombia, QMI, University of British Columbia, Physics and Astronomy, University of British Columbia, Stuart Blussom Quantum Matter Institute, University of British Columbia, Quantum Matter Institute, University of British Columbia, Department of Physics & Astronomy, University of British Columbia

  • Marcel Franz

    University of British Columbia, Department of Physics and Astronomy, University of British Columbia