Critical Delocalization Of Chiral Zero Energy Modes In Graphene

Abstract

Graphene subjected to chiral-symmetric disorder is believed to host zero energy modes (ZEMs) resilient to localization, as suggested by the renormalization group analysis of the underlying nonlinear sigma model. We report accurate quantum transport calculations in honeycomb lattices with in excess of 109 sites and fine meV resolutions. The Kubo dc conductivity of ZEMs induced by vacancy defects (chiral BDI class) is found to match 4e2/πh within 1% accuracy, over a parametrically wide window of energy level broadenings and vacancy concentrations. Our results disclose an unprecedentedly robust metallic regime in graphene, providing strong evidence that the early field-theoretical picture for the BDI class is valid well beyond its controlled weak-coupling regime.

Publication Date

8-31-2015

Publication Title

Physical Review Letters

Volume

115

Issue

10

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1103/PhysRevLett.115.106601

Socpus ID

84944110461 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84944110461

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