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Häfner, V. ; Schindler, J. ; Weik, N. ; Mayer, T. ; Balakrishnan, S. ; Narayanan, R. ; Bera, S. ; Evers, Ferdinand

Density of States in Graphene with Vacancies: Midgap Power Law and Frozen Multifractality

Häfner, V., Schindler, J., Weik, N., Mayer, T., Balakrishnan, S., Narayanan, R., Bera, S. and Evers, Ferdinand (2014) Density of States in Graphene with Vacancies: Midgap Power Law and Frozen Multifractality. Physical Review Letters 113 (18), p. 186802.

Date of publication of this fulltext: 11 Jun 2021 06:58
Article
DOI to cite this document: 10.5283/epub.45964


Abstract

The density of states ϱ(E) of graphene is investigated numerically and within the self-consistent T-matrix approximation in the presence of vacancies within the tight binding model. The focus is on compensated disorder, where the concentration of vacancies nA and nB in both sublattices is the same. Formally, this model belongs to the chiral symmetry class BDI. The nonlinear sigma model predicts ...

The density of states ϱ(E) of graphene is investigated numerically and within the self-consistent T-matrix approximation in the presence of vacancies within the tight binding model. The focus is on compensated disorder, where the concentration of vacancies nA and nB in both sublattices is the same. Formally, this model belongs to the chiral symmetry class BDI. The nonlinear sigma model predicts for BDI a Gade-type singularity ϱ(E)∼|E|−1exp[−|log(E)|−1/x]. Our numerical data are comparable to this result in a preasymptotic regime that gives way, however, at even lower energies to ϱ(E)∼E−1|log(E)|−˜x, 1≤˜x<2. We take this finding as evidence that, similar to the case of dirty d-wave superconductors, generic bipartite random hopping models may also exhibit unconventional (strong-coupling) fixed points for certain kinds of randomly placed scatterers if these are strong enough. Our research suggests that graphene with (effective) vacancy disorder is a physical representative of such systems.



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Details

Item typeArticle
Journal or Publication TitlePhysical Review Letters
Publisher:American Physical Society (APS)
Open Access Type:Due to SHERPA/RoMEO
Volume:113
Number of Issue or Book Chapter:18
Page Range:p. 186802
Date29 October 2014
InstitutionsPhysics > Institute of Theroretical Physics > Chair Ferdinand Evers
Identification Number
ValueType
10.1103/PhysRevLett.113.186802DOI
Dewey Decimal Classification500 Science > 530 Physics
StatusPublished
RefereedYes, this version has been refereed
Created at the University of RegensburgNo
URN of the UB Regensburgurn:nbn:de:bvb:355-epub-459646
Item ID45964

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