Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 39: 2D Materials III: Growth and Heterostructures (joint session O/HL)
O 39.6: Talk
Tuesday, March 17, 2020, 11:45–12:00, GER 38
Electronic properties of coherently attached nanocrystals measured by scanning tunneling spectroscopy — •Pierre Capiod1, Maaike van der Sluijs1, Jeroen de Boer1, Christophe Delerue2, Ingmar Swart1, and Daniel Vanmaekelbergh1 — 1Debye Institute for Nanomaterials Science, Utrecht University, PO Box 80 000, 3508 TA Utrecht, the Netherlands — 2Université Lille, CNRS, Centrale Lille, ISEN, Université Valenciennes, UMR 8520 - IEMN, F-59000 Lille, France
2D systems have attracted considerable interest in recent years. The first 2D material was graphene which displays a rich band structure. While it is not possible to create a 2D honeycomb structure with any element we want, artificial lattices emerge as new field to explore. It was shown that it is possible to create superlattices based on semiconductor nanocrystals (PbSe, CdSe) as building blocks in a square and honeycomb geometry. It is of high interest to combine the large scale self-assembly of such superlattices with the possibility of optical and electrical switching. Theoretical works have been initiated based on tight-binding calculations. Those calculations have shown that the atomic crystalline structure of the nanocrystals combined with the square or honeycomb geometry determine the band structure of the system where Dirac-cones and non-trivial flat bands appear. Until now, the density of states of those structures has not been resolved. In this presentation, I will describe the synthesis and the preparation of the samples and present the measurements of the density of states on PbSe square superlattices by scanning tunneling spectroscopy