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3 October 2022 Terahertz scanning tunneling spectroscopy on the atomic scale
Spencer E. Ammerman, Vedran Jelic, Yajing Wei, Mohamed Hassan, Sheng Lee, Vivian N. Breslin, Nathan Everett, Qiang Sun, Carlo A. Pignedoli, Pascal Ruffieux, Roman Fasel, Tyler Cocker
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Proceedings Volume 12230, Terahertz Emitters, Receivers, and Applications XIII; 1223001 (2022) https://doi.org/10.1117/12.2635067
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States
Abstract
Terahertz scanning tunneling microscopy (THz-STM) is an emerging technique that provides simultaneous ultrafast temporal and Angstrom spatial resolution through lightwave control of an atomic tunnel junction. THz-STM can further accesses extreme tunneling regimes thanks to the low duty cycle and ultrafast duration of the THz bias. Here, we use low-temperature, ultrahigh vacuum THz-STM to explore the local density of electronic states in 7-atom-wide armchair graphene nanoribbons (7AGNRs) at tip heights that are inaccessible to conventional STM. Using a new procedure for THz scanning tunneling spectroscopy (THz-STS), we determine the differential conductance above the 7AGNR with atomic resolution in three dimensions.
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Spencer E. Ammerman, Vedran Jelic, Yajing Wei, Mohamed Hassan, Sheng Lee, Vivian N. Breslin, Nathan Everett, Qiang Sun, Carlo A. Pignedoli, Pascal Ruffieux, Roman Fasel, and Tyler Cocker "Terahertz scanning tunneling spectroscopy on the atomic scale", Proc. SPIE 12230, Terahertz Emitters, Receivers, and Applications XIII, 1223001 (3 October 2022); https://doi.org/10.1117/12.2635067
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KEYWORDS
Terahertz spectroscopy
Scanning tunneling microscopy
Spectroscopy
Terahertz radiation
Ultrafast phenomena
Graphene
Spatial resolution
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