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

Ilkka Kylänpää, Fulvio Berardi, Esa Räsänen, Pablo García-González, Carlo Andrea Rozzi, Angel Rubio
2016 New Journal of Physics  
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
more » ... 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.
doi:10.1088/1367-2630/18/8/083014 fatcat:z6zhl2ihpndpvfunbenuuemjrq