Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 81: Gerhard Ertl Young Investigator Award

O 81.1: Hauptvortrag

Donnerstag, 4. April 2019, 10:30–11:00, H24

Zooming in on the electronic properties of van der Waals Heterostructures — •Søren Ulstrup1, Jyoti Katoch2, Roland J. Koch3, Simon Moser3, Kathleen M. McCreary4, Simranjeet Singh2, Jinsong Xu2, Berend T. Jonker3, Roland K. Kawakami2, Aaron Bostwick3, Eli Rotenberg3, and Chris Jozwiak31Department of Physics and Astronomy, Aarhus University, DK — 2Department of Physics, Ohio State University, USA — 3Advanced Light Source, Berkeley Lab, USA — 4Navel Research Lab, USA

Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) exhibit a diverse collection of intriguing electronic phenomena. These include single-particle effects related to new spin and valley physics, as well as exotic many-body interactions. The latter are exemplified by the presence of tunable band gaps and tightly bound excitons and trions. Here, I will show how the electronic properties of complex heterostructures composed of tungsten disulfide and boron nitride (WS2/hBN) can be accessed using angle-resolved photoemission spectroscopy with nano-scale spatial resolution (nanoARPES). I will present three major discoveries in such stacks: (i) The direct observation of the energy- and momentum-dependent electronic structure of one-dimensional TMD nanoscrolls, (ii) a substrate-induced lateral band bending, demonstrating ultimate control of band offsets at the nanoscale, and (iii) a doping dependent three-particle excitation in the measured spectral function which is consistent with the formation of a trion.

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