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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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| Item type | Article | ||||
| Journal or Publication Title | Physical 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 | ||||
| Date | 29 October 2014 | ||||
| Institutions | Physics > Institute of Theroretical Physics > Chair Ferdinand Evers | ||||
| Identification Number |
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| Dewey Decimal Classification | 500 Science > 530 Physics | ||||
| Status | Published | ||||
| Refereed | Yes, this version has been refereed | ||||
| Created at the University of Regensburg | No | ||||
| URN of the UB Regensburg | urn:nbn:de:bvb:355-epub-459646 | ||||
| Item ID | 45964 |
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