Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 92: Nanostructures at surfaces: Dots, particles, clusters I

O 92.1: Hauptvortrag

Donnerstag, 15. März 2018, 10:30–11:00, MA 141

0-D and 1-D heterostructure mediated material properties of 2-D Transition Metal Dichalcogenides — •Alexander Weber-Bargioni — Lawrence Berkeley National Laboratory, Berkeley, Ca, USA

In this presentation we show how individual atomic defects and linear mirror twin boundaries in 2-D MoSe2, identified with super resolution atomic force microscopy, alter the electronic wave function, imaged via Scanning Tunneling Spectroscopic mapping, leading along mirror twin boundaries to charge density waves and solitons.

Hierarchically ordered defects or adsorbents in two dimensional transition metal dichalcogenides (TMDs - MoS2, WS2, MoSe2, etc*) modify the local electronic states in terms of energy and geometry of the electronic wave functions at length scales of individual wave functions, inducing novel functionality. Due to their 2-D nature, 2-D TMDs are an excellent model system to directly access, visualize and determine the effects of defect mediated electronic wave function tuning using high resolution AFM and differential conductance mapping.

We show the rich, localized electronic structure of individual vacancies and atomic replacements creating 0-D heterostructure, and how 1-D defects can undergo quantum phase transitions creating charge density waves and solitons.