99083 20241108104651.0 doi 10.1103/PhysRevLett.125.256804 sideral 122323 ART-2020-122323 eng Brey, L. Plasmonic Dirac Cone in Twisted Bilayer Graphene 2020 Access copy available to the general public Unrestricted We discuss plasmons of biased twisted bilayer graphene when the Fermi level lies inside the gap. The collective excitations are a network of chiral edge plasmons (CEP) entirely composed of excitations in the topological electronic edge states that appear at the AB-BA interfaces. The CEP form a hexagonal network with a unique energy scale ?p=(e2)/(?0?t0) with t0 the moiré lattice constant and ? the dielectric constant. From the dielectric matrix we obtain the plasmon spectra that has two main characteristics: (i) a diverging density of states at zero energy, and (ii) the presence of a plasmonic Dirac cone at â., ?~?p/2 with sound velocity vD=0.0075c, which is formed by zigzag and armchair current oscillations. A network model reveals that the antisymmetry of the plasmon bands implies that CEP scatter at the hexagon vertices maximally in the deflected chiral outgoing directions, with a current ratio of 4/9 into each of the deflected directions and 1/9 into the forward one. We show that scanning near-field microscopy should be able to observe the predicted plasmonic Dirac cone and its broken symmetry phases. info:eu-repo/grantAgreement/ES/DGA/Q-MAD info:eu-repo/grantAgreement/EC/H2020/785219/EU/Graphene Flagship Core Project 2/GrapheneCore2 This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 785219-GrapheneCore2 info:eu-repo/grantAgreement/EC/H2020/881603/EU/Graphene Flagship Core Project 3/GrapheneCore3 This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 881603-GrapheneCore3 info:eu-repo/grantAgreement/ES/MINECO/FIS2017-82260-P info:eu-repo/grantAgreement/ES/MINECO/MAT2017-88358-C3-1-R info:eu-repo/grantAgreement/ES/MINECO/PGC2018-096955-B-C42 info:eu-repo/grantAgreement/ES/MINECO/PGC2018-097018-B-100 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 9.161 2020 PHYSICS, MULTIDISCIPLINARY 7 / 84 = 0.083 2020 Q1 T1 3.688 2020 Physics and Astronomy (miscellaneous) 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Stauber, T. Slipchenko, T. (orcid)0000-0003-3918-0275 Martín-Moreno, L. Universidad de Zaragoza (orcid)0000-0001-9273-8165 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 125, 25 (2020), 256804 [6 pp] Phys. rev. lett. Physical Review Letters 0031-9007 2792034 http://zaguan.unizar.es/record/99083/files/texto_completo.pdf Versión publicada 3058322 http://zaguan.unizar.es/record/99083/files/texto_completo.jpg?subformat=icon icon Versión publicada http://revistainclusiones.org/index.php/inclu/article/view/1850/1910 Texto completo de la revista oai:zaguan.unizar.es:99083 articulos driver 2024-11-08-10:44:44 ARTICLE