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

MPG-Autoren
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Rubio,  Angel
Nano-Bio Spectroscopy group, Universidad del País Vasco, CFM CSIC-UPV/EHU-MPC and DIPC, Avenida de Tolosa 72, E-20018 Donostia, Spain;
ETSF Scientific Development Centre, Avenida Tolosa 72, E-20018 San Sebastián, Spain;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science and Department of Physics, Luruper Chaussee 149, 22761 Hamburg, Germany;

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Zitation

Kylänpää, I., Berardi, F., Räsänen, E., García-González, P., Rozzi, C. A., & Rubio, A. (2016). Stability of the Dirac cone in artificial graphene formed in quantum wells: a computational many-electron study. New Journal of Physics, 18(8): 083014. doi:10.1088/1367-2630/18/8/083014.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002B-1B9C-8
Zusammenfassung
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.