Stability of the Dirac cone in artificial graphene formed in quantum wells: a computational many-electron study. (3rd August 2016)

• Record Type: Journal Article
• Authors: Kylänpää, Ilkka; Berardi, Fulvio; Räsänen, Esa; García-González, Pablo; Rozzi, Carlo Andrea; Rubio, Angel
• Is Part Of: New journal of physics. Volume 18:Number 8(2016:Aug.)
• Publication Date: 2016-08-03
• Subjects: artificial graphene -- Dirac materials -- stability properties; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/18/8/083014
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We carry out a comprehensive computational study on the stability of the Dirac cone in artificial graphene realized in nanopatterned quantum wells. Our real-space approach allows us to vary the size, shape, and positioning of the quantum dots in the hexagonal lattice. We compare the (noninteracting) single-particle calculations to density-functional studies within both local-density approximation and meta-generalized-gradient approximation. Furthermore, the density-functional results are compared against numerically precise path-integral quantum Monte Carlo calculations. As a whole, our results indicate high stability of the Dirac bands against external parameters, which is reassuring for further experimental investigations.