Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session X17: Thin Film and Surface Applications
8:00 AM–11:00 AM,
Friday, March 9, 2018
LACC Room: 306A
Sponsoring Unit: DCMP
Chair: Alexandra Curtin, NIST Boulder
Abstract: X17.00006 : Measuring the Unoccupied Band Structure with ~10nm Lateral Resolution*
9:00 AM–9:12 AM
(Universidad del Pais Vasco)
(IBM T.J. Watson Research Center )
Sense Jan Van der Molen
The properties of any material are fundamentally determined by its electronic band structure. But, while the occupied bands below the Fermi level can be routinely measured, it is remarkably difficult to characterize the empty part of the band structure experimentally. We introduce angle-resolved reflected-electron spectroscopy (ARRES), a technique to measure these bands [J. Jobst et al. Nature Commun. 6, 8926 (2015)]. It relies on the dependence of the reflectivity of low-energy electrons on their incidence angle on the sample and their kinetic energy and has a spatial resolution 10nm. We use ARRES to study the unoccupied band structure of van der Waals crystals – custom-built stacks of two-dimensional materials, such as graphene, boron nitride, or transitionmetal dichalcogenides. We show that ARRES can shed light on the interaction between electronic states of individual layers [J, Jobst, et al. Nature Commun. 7, 13621 (2016)], an important step towards tailoring the properties of Van der Waals crystals in a LEGO-like fashion.
*This work was supported by MINECO (project number FIS2013-48286-C2-1- P), NWO via an NWO-Groot grant (‘ESCHER’), a VIDI grant (680-47-502, S.J.v.d.M.), a VENI grant (680-47-447, J.J.) and the NSF grant DMR-1463465.
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700