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Electronic structure of two-dimensional crystals from ab initio theory
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, no 11, 115409- p.Article in journal (Refereed) Published
Abstract [en]

We report on ab initio calculations of the two-dimensional systems MoS2 and NbSe2, which recently were synthesized. We find that two-dimensional MoS2 is a semiconductor with a gap which is rather close to that of the three-dimensional analog, and that NbSe2 is a metal, which is similar to the three-dimensional analog of this compound. We further computed the electronic structure of the two-dimensional hexagonal (graphene-like) lattices of Si and Ge and compared them with the electronic structure of graphene. It is found that the properties related to the Dirac cone do not appear in the case of two-dimensional hexagonal germanium, which is metallic, contrary to two-dimensional hexagonal silicon, also known as silicene, which has an electronic structure very similar to the one of graphene, making them possibly equivalent.

Place, publisher, year, edition, pages
2009. Vol. 79, no 11, 115409- p.
Keyword [en]
ab initio calculations, band structure, molybdenum compounds, niobium alloys, selenium alloys, semiconductor materials
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-129131DOI: 10.1103/PhysRevB.79.115409ISI: 000264768900116OAI: oai:DiVA.org:uu-129131DiVA: diva2:337708
Available from: 2010-08-09 Created: 2010-08-05 Last updated: 2010-08-09Bibliographically approved

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