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

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.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002B-1B9C-8 Version Permalink: https://hdl.handle.net/21.11116/0000-0003-A4D4-4
Genre: Journal Article

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2016
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© I. Kylänpää et al.
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http://dx.doi.org/10.1088/1367-2630/18/8/083014 (Publisher version)
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 Creators:
Kylänpää, Ilkka1, Author
Berardi, Fulvio2, 3, Author
Räsänen, Esa1, Author
García-González, Pablo3, 4, Author
Rozzi, Carlo Andrea5, Author
Rubio, Angel2, 3, 6, 7, Author           
Affiliations:
1Department of Physics, Tampere University of Technology, P O Box 692, FI-33101 Tampere, Finland, ou_persistent22              
2Nano-Bio Spectroscopy group, Universidad del País Vasco, CFM CSIC-UPV/EHU-MPC and DIPC, Avenida de Tolosa 72, E-20018 Donostia, Spain, ou_persistent22              
3ETSF Scientific Development Centre, Avenida Tolosa 72, E-20018 San Sebastián, Spain, ou_persistent22              
4Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain, ou_persistent22              
5Istituto Nanoscienze—Consiglio Nazionale delle Ricerche (CNR), Centro S3, via Campi 213a, I-1125 Modena, Italy, ou_persistent22              
6Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
7Center for Free-Electron Laser Science and Department of Physics, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              

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Free keywords: artificial 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.

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Language(s): eng - English
 Dates: 2016-06-202016-07-212016-08-03
 Publication Status: Published online
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1367-2630/18/8/083014
 Degree: -

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Project name : This work has been supported by the Academy of Finland (grant agreement No. 267686) and the Nordic Innovation through its Top-Level Research Initiative (Project No. P-13053), the European Research Council (ERC-2015-AdG-694097), the Spanish Ministry of Economy and Competitiveness (grants FIS2013-46159-C3-1-P, and MAT2014-53432-C5-5-R), the Basque Country Government (Grupos Consolidados IT-578-13), FP7 MC-IIF MODENADYNA (grant agreement No. 623413), and COST Action MP1306 (EUSpec). PGG acknowledges financial support from the Spanish Ministry of Economy and Competitiveness, through the 'María de Maeztu' Programme for Units of Excellence in R&D (MDM-2014-0377). We also acknowledge CSC and TCSC for computational resources.
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Source 1

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Title: New Journal of Physics
  Abbreviation : New J. Phys.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 18 (8) Sequence Number: 083014 Start / End Page: - Identifier: ISSN: 1367-2630
CoNE: https://pure.mpg.de/cone/journals/resource/954926913666