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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. und Evers, Ferdinand (2014) Density of States in Graphene with Vacancies: Midgap Power Law and Frozen Multifractality. Physical Review Letters 113 (18), S. 186802.

Veröffentlichungsdatum dieses Volltextes: 11 Jun 2021 06:58
Artikel
DOI zum Zitieren dieses Dokuments: 10.5283/epub.45964


Zusammenfassung

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

DokumentenartArtikel
Titel eines Journals oder einer ZeitschriftPhysical Review Letters
Verlag:American Physical Society (APS)
Band:113
Nummer des Zeitschriftenheftes oder des Kapitels:18
Seitenbereich:S. 186802
Datum29 Oktober 2014
InstitutionenPhysik > Institut für Theoretische Physik > Lehrstuhl Ferdinand Evers
Identifikationsnummer
WertTyp
10.1103/PhysRevLett.113.186802DOI
Dewey-Dezimal-Klassifikation500 Naturwissenschaften und Mathematik > 530 Physik
StatusVeröffentlicht
BegutachtetJa, diese Version wurde begutachtet
An der Universität Regensburg entstandenNein
URN der UB Regensburgurn:nbn:de:bvb:355-epub-459646
Dokumenten-ID45964

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