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Title: | Effective Medium Model for Graphene Superlattices with Electrostatic and Magnetic Vector Potentials | Authors: | Fernandes, David E. | Keywords: | Physics; Mesoscopic Systems and Quantum Hall Effect | Issue Date: | 6-Jan-2023 | Publisher: | American Physical Society | Project: | This work was partially funded by the Institution of Engineering and Technology (IET) under the A F Harvey Research Prize 2018, by the Simons Foundation, by Fundação para Ciência e a Tecnologia under Project No. PTDC/EEITEL/4543/2014 and by Instituto de Telecomunicações under Project No. UID/EEA/50008/2020. D.E.F. acknowledges support by FCT, POCH, and the cofinancing of Fundo Social Europeu under Fellowship No. SFRH/BPD/116525/2016 and by IT-Lisbon under the research contract with reference C-0042-22. D.E.F. | Serial title, monograph or event: | Physical Review B | Volume: | 107 | Issue: | 8 | Abstract: | In this article we develop an effective medium model to characterize the electron wave propagation in graphene based nanostructures with an electrostatic and magnetic vector potentials imposed on their surface. We use a numerical algorithm to determine the effective medium parameters of the heterostructure and calculate the electronic band structure of the system. We apply our formalism to analyze superlattices with solely a magnetic potential and reveal that the response of the structure remains reciprocal and is characterized by a decrease in charge carrier's velocity. We also study the response of superlattices with both potentials superimposed on graphene and show that the response of the system becomes nonreciprocal with a dispersion characterized by a tilted Dirac cone. We demonstrate that it is possible to alternate between a type-I, type-II or type-III Dirac cones by properly tuning the amplitude of the potentials. | Description: | 30 pages, 6 figures | URI: | https://hdl.handle.net/10316/113881 | ISSN: | 2469-9950 2469-9969 |
DOI: | 10.1103/PhysRevB.107.085119 | Rights: | openAccess |
Appears in Collections: | I&D IT - Artigos em Revistas Internacionais FCTUC Eng.Electrotécnica - Artigos em Revistas Internacionais |
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Effective medium model for graphene superlattices with electrostatic and magnetic vector potentials.pdf | 1.21 MB | Adobe PDF | View/Open |
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