Lightwave-driven tunneling spectroscopy of graphene nanoribbons
ORAL
Abstract
Novel atomic-scale electronics operating at optical frequencies require new tools that can characterize them and inform device fabrication. Lightwave-driven scanning tunneling microscopy is a promising new technique towards this purpose. By coupling free-space-propagating single-cycle terahertz transients to an atomically sharp metal tip, it achieves simultaneous sub-angstrom and sub-picosecond spatio-temporal resolution [1–7]. Here, we utilize terahertz scanning tunneling microscopy (THz-STM) and spectroscopy (THz-STS) to investigate seven-atom-wide graphene nanoribbons on an Au(111) surface and unveil highly localized wavefunctions that are inaccessible with conventional scanning tunneling microscopy [7]. Three-dimensional tomographic THz-STM imaging of the electron densities of the wavefunctions reveals a faster vertical decay of the valance band compared to the conduction band.
References
References
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[2] T. L. Cocker et al. Nature 539, 263–267 (2016).
[3] V. Jelic et al. Nat. Phys. 13, 591–598 (2017).
[4] D. Peller et al. Nature 585, 58-62 (2020).
[5] D. Peller et al. Nat. Photon. 15, 143–147 (2021).
[6] T. L. Cocker et al. Nat. Photon. 15, 558–569 (2021).
[7] S. Ammerman et al. Nat. Commun. (in Press).
*This work was supported by the Department of the Navy, Office of Naval Research (ONR award numbers N00014-19-1-2051 and N00014-21-1-2682) and the Cowen Family Endowment.
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Publication: S. E. Ammerman et al., Lightwave-driven scanning tunnelling spectroscopy of atomically precise graphene nanoribbons (in press)
S. E. Ammerman et al., An algorithm for scanning tunneling spectroscopy (submitted)
Presenters
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Spencer E Ammerman
- Michigan State University
- Department of Physics and Astronomy, Michigan State University