Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session C57: Adsorption and Dopants in 2D Materials
3:00 PM–6:00 PM,
Monday, March 15, 2021
Sponsoring
Units:
DMP DCMP
Chair: Shawna Hollen, Univ of New Hampshire
Abstract: C57.00014 : Electronic, vibronic, and magnetic properties of a carbon radical anion in 2D WS2
5:36 PM–5:48 PM
Not Participating
Presenter:
Katherine Cochrane
(Lawrence Berkeley National Laboratory)
Authors:
Katherine Cochrane
(Lawrence Berkeley National Laboratory)
Jun-Ho Lee
(Lawrence Berkeley National Laboratory)
Christoph Kastl
(Technical University of Munich)
Jonah Haber
(University of California Berkeley)
Tianyi Zhang
(The Penn State University)
Azimkhan Kozhakhmetov
(The Penn State University)
Joshua Robinson
(The Penn State University)
Mauricio Terrones
(The Penn State University)
Jascha Repp
(Universität Regensburg)
Jeffrey Neaton
(University of California Berkeley)
Alexander Weber-Bargioni
(Lawrence Berkeley National Laboratory)
Bruno Schuler
(EMPA)
Here we use scanning tunneling microscopy and spectroscopy (STM/S) and CO functionalized tip atomic force microscopy (AFM) in combination with ab initio calculations to characterize a carbon point defect in WS2.[1] Previously, we identified a C-H complex as a common impurity in synthetic TMDs, which can also be doped with a methane plasma.[2] With the STM tip, we are able to selectively remove the hydrogen atom, resulting in a single, negatively charged carbon atom with a spin 1/2.[3] Here we demonstrate the ability to generate on demand, spin ½ centers with atomic precision and characterize the electronic and vibronic properties of these carbon point defects.
[1] Schuler, B., et al. ACS Nano 13, 9 (2019)
[2] Cochrane, K.A., et al. 2D Materials 7, 3 (2020)
[3] Cochrane, K.A., et al. arXiv preprint arXiv:2008.12196 (2020)
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