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Nanoscale mapping of quasiparticle band alignment

DOI: 10.1038/s41467-019-11253-2 DOI Help

Authors: Soeren Ulstrup (Aarhus University) , Cristina E. Giusca (National Physical Laboratory) , Jill A. Miwa (Aarhus University) , Charlotte Sanders (Central Laser Facility, STFC Rutherford Appleton Laboratory) , Alex Browning (National Physical Laboratory) , Pavel Dudin (Diamond Light Source) , Cephise Cacho (Diamond Light Source) , Olga Kazakova (National Physical Laboratory) , D. Kurt Gaskill (U.S. Naval Research Laboratory) , Rachael L. Myers-Ward (U.S. Naval Research Laboratory) , Tianyi Zhang (The Pennsylvania State University) , Mauricio Terrones (The Pennsylvania State University) , Philip Hofmann (Aarhus University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 10

State: Published (Approved)
Published: July 2019
Diamond Proposal Number(s): 19260

Open Access Open Access

Abstract: Control of atomic-scale interfaces between materials with distinct electronic structures is crucial for the design and fabrication of most electronic devices. In the case of two-dimensional materials, disparate electronic structures can be realized even within a single uniform sheet, merely by locally applying different vertical gate voltages. Here, we utilize the inherently nano-structured single layer and bilayer graphene on silicon carbide to investigate lateral electronic structure variations in an adjacent single layer of tungsten disulfide (WS2). The electronic band alignments are mapped in energy and momentum space using angle-resolved photoemission with a spatial resolution on the order of 500 nm (nanoARPES). We find that the WS2 band offsets track the work function of the underlying single layer and bilayer graphene, and we relate such changes to observed lateral patterns of exciton and trion luminescence from WS2.

Journal Keywords: Condensed-matter physics; Nanoscale devices

Diamond Keywords: Semiconductors

Subject Areas: Materials, Physics

Instruments: I05-ARPES

Added On: 29/07/2019 11:57


Discipline Tags:

Physics Hard condensed matter - structures Electronics Materials Science Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES) Nano ARPES