Valley polarization braiding in strained graphene

ORAL

Abstract

Previous works on deformed graphene predict the existence of valley-polarized states, however, optimal conditions for their detection remain challenging. We show that in the quantum Hall regime, edge-like states in strained regions can be isolated in energy within Landau gaps. We identify precise conditions for new conducting edges-like states to be valley polarized, with the flexibility of positioning them at chosen locations in the system. A map of local density of states as a function of energy and position reveals a unique braid pattern that serves as a fingerprint to identify valley polarization[1].
[1] arXiv:1909.12017

*IRTA-APS (DF, NS), CAPES (PrInt), CNPq (AL, CL), FAPERJ E-26/202.953/2016 (AL) and E-26/202.768/2016 (LRFL), INCT Carbon Nanomaterials (AL, DF), NSF-DMR 1508325 (DF, NS), Aspen Center for Physics NSF PHY-1607611 (NS), Ohio Supercomputer Center PHS0265. DF is the Glidden Visiting Professor at OU.

–

Presenters

  • Daiara Faria

    • Instituto Politécnico, Universidade do Estado do Rio de Janeiro

Authors

  • Daiara Faria

    • Instituto Politécnico, Universidade do Estado do Rio de Janeiro

  • Carlos León

    • Instituto de Física, Universidade Federal Fluminense

  • Leandro R. F. Lima

    • Departamento de Física, Universidade Federal Rural do Rio de Janeiro

  • Andrea Latgé

    • Instituto de Física, Niterói, RJ Brazil, Universidade Federal Fluminense
    • Instituto de Física, Universidade Federal Fluminense

  • Nancy Sandler

    • Department of Physics and Astronomy, Ohio University
    • Ohio Univ
    • Ohio University