Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Q31: Microscopy 1: Electrons, THz, Optical
3:00 PM–5:48 PM,
Wednesday, March 16, 2022
Room: McCormick Place W-192A
Sponsoring
Unit:
GIMS
Chair: Melissa Santala, Oregon State
Abstract: Q31.00006 : Atomic scale direct-write dopant patterning on graphene*
4:24 PM–4:36 PM
Presenter:
Andrew R Lupini
(Oak Ridge National Lab)
Authors:
Andrew R Lupini
(Oak Ridge National Lab)
Ondrej Dyck
(ORNL)
Mina Yoon
(Oak Ridge National Lab)
Sergei V Kalinin
(Oak Ridge National Lab)
Jacob Swett
(ASU)
Stephen Jesse
(University of Tennessee)
In parallel, the recent advent of pseudo-2D and monolayer materials has opened a new landscape to explore. For example, twisted bilayer graphene is an atomically thin, tunable material with exotic quantum properties that depend sensitively on the stacking details and twist angle. The ability to insert dopants at specific locations could be an important way to functionalize and exploit such materials.
This talk will examine routes towards atomic-scale direct-write patterning on graphene. The focused electron beam in a scanning transmission electron microscope (STEM) is used to define attachment points for foreign atoms. Sample temperature is used to control the supply of dopant atoms, which can selectively replace carbon atoms in the lattice. Using image-based feedback-control, arbitrary patterns of atoms and atom clusters are attached to the graphene with limited human interaction.
*This material is based upon work supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division and was performed at the Oak Ridge National Laboratory’s Center for Nanophase Materials Sciences (CNMS), a U.S. Department of Energy, Office of Science User Facility.
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