Unraveling the intrinsic and robust nature of van hove singularities in twisted bilayer graphene by scanning tunneling microscopy and theoretical analysis
Entidad
UAM. Departamento de Física de la Materia CondensadaFecha de edición
2012-11-08Cita
10.1103/PhysRevLett.109.196802
Physical Review Letters 109.19 (2012): 196802
ISSN
0031-9007 (print); 1079-7114 (online)DOI
10.1103/PhysRevLett.109.196802Financiado por
This work was supported by Spain’s MICINN under Grants No. MAT2010-14902, No. CSD2010-00024, and No. CSD2007-00050, and by Comunidad de Madrid under Grant No. S2009/MAT-1467. M. M. U., I. B., P. M, J.-Y.V., L. M., and J. M. G.-R. also acknowledge the PHC Picasso program for financial support (Project No. 22885NH). I. B. was supported by a Ramón y Cajal project of the Spanish MEC. L. M., P. M., and J.-Y.V. acknowledge support from Fondation Nanosciences (Dispograph project)Proyecto
Comunidad de Madrid. S2009/MAT-1467/NANOOBJETOS; Gobierno de España. MAT2010-14902; Gobierno de España. CSD2010-00024; Gobierno de España. CSD2007-00050Versión del editor
http://dx.doi.org/10.1103/PhysRevLett.109.196802Materias
FísicaDerechos
© 2012 American Physical SocietyResumen
Extensive scanning tunneling microscopy and spectroscopy experiments complemented by first-principles and parametrized tight binding calculations provide a clear answer to the existence, origin, and robustness of vanHove singularities (vHs) in twisted graphene layers. Our results are conclusive: vHs due to interlayer coupling are ubiquitously present in a broad range (from 1º to 10º) of rotation angles in our graphene on 6H-SiC(000-1) samples. From the variation of the energy separation of the vHs with the rotation angle we are able to recover the Fermi velocity of a graphene monolayer as well as the strength of the interlayer interaction. The robustness of the vHs is assessed both by experiments, which show that they survive in the presence of a third graphene layer, and by calculations, which test the role of the periodic modulation and absolute value of the interlayer distance. Finally, we clarify the role of the layer topographic corrugation and of electronic effects in the apparent moiré contrast measured on the STM images
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Google Scholar:Brihuega Álvarez, Iván
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Mallet, P.
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González-Herrero, H.
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Trambly De Laissardière, G.
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Ugeda, M. M.
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Magaud, L.
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Gómez Rodríguez, José María
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Ynduráin Muñoz, Félix
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Veuillen, J. Y.
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