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Stability of the Dirac cone in artificial graphene formed in quantum wells: a computational many-electron study

TitleStability of the Dirac cone in artificial graphene formed in quantum wells: a computational many-electron study
Publication TypeJournal Article
Year of Publication2016
AuthorsKylanpaa, I., Berardi F., Rasanen E., Garcia-Gonzalez P., Rozzi C. A., & Rubio A.
Keywordsartificial graphene; Dirac materials; stability properties
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.

JournalNEW JOURNAL OF PHYSICS
Volume18
DOI10.1088/1367-2630/18/8/083014
Date PublishedAUG 3
Type of ArticleArticle
Citation Key ISI:000393038100001