Unconventional features in the quantum Hall regime of disordered graphene : Percolating impurity states and Hall conductance quantization
| Autor: | Frank Ortmann, Alessandro Cresti, Nicolas Leconte, Stephan Roche |
|---|---|
| Přispěvatelé: | ICN2 - Institut Catala de Nanociencia i Nanotecnologia (ICN2), Universitat Autònoma de Barcelona (UAB), Department of Physics, University of Seoul, Dresden Center for Computational Materials Science, Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institució Catalana de Recerca i Estudis Avançats (ICREA), European Project: 604391,EC:FP7:ICT,FP7-ICT-2013-FET-F,GRAPHENE(2013), European Commission, German Research Foundation, Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Graphene FOS: Physical sciences Conductance 02 engineering and technology Quantum Hall effect 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences law.invention Quantization (physics) Quantum spin Hall effect law Quantum mechanics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences media_common.cataloged_instance European union 010306 general physics 0210 nano-technology [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall] media_common |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2016, 93 (11), pp.115404. ⟨10.1103/PhysRevB.93.115404⟩ Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Digital.CSIC. Repositorio Institucional del CSIC Recercat: Dipósit de la Recerca de Catalunya Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2016, 93 (11), pp.115404. ⟨10.1103/PhysRevB.93.115404⟩ |
| ISSN: | 2013-0295 1098-0121 1550-235X |
| DOI: | 10.1103/PhysRevB.93.115404⟩ |
| Popis: | We report on the formation of critical states in disordered graphene, at the origin of variable and unconventional transport properties in the quantum Hall regime, such as a zero-energy Hall conductance plateau in the absence of an energy band gap and Landau-level degeneracy breaking. By using efficient real-space transport methodologies, we compute both the dissipative and Hall conductivities of large-size graphene sheets with random distribution of model single and double vacancies. By analyzing the scaling of transport coefficients with defect density, system size, and magnetic length, we elucidate the origin of anomalous quantum Hall features as magnetic-field-dependent impurity states, which percolate at some critical energies. These findings shed light on unidentified states and quantum-transport anomalies reported experimentally. This research is partly funded by the European Union Seventh Framework Programme under Grant No. 604391 Graphene Flagship. ICN2 acknowledges support from the Severo Ochoa Program (MINECO, Grant No. SEV-2013-0295). F.O. would like to thank the Deutsche Forschungsgemeinschaft for financial support (Grant No. OR 349/1-1). |
| Databáze: | OpenAIRE |
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