Roelcke, C. and Kastner, L. Z. and Graml, M. and Biereder, A. and Wilhelm, J. and Repp, J. and Huber, R. and Gerasimenko, Y. A. (2024) Ultrafast atomic-scale scanning tunnelling spectroscopy of a single vacancy in a monolayer crystal. NATURE PHOTONICS, 18 (6). pp. 595-602. ISSN 1749-4885, 1749-4893
Full text not available from this repository. (Request a copy)Abstract
Defects in atomically thin semiconductors and their moire heterostructures have emerged as a unique testbed for quantum science. Strong light-matter coupling, large spin-orbit interaction and enhanced Coulomb correlations facilitate a spin-photon interface for future qubit operations and efficient single-photon quantum emitters. Yet, directly observing the relevant interplay of the electronic structure of a single defect with other microscopic elementary excitations on their intrinsic length, time and energy scales remained a long-held dream. Here we directly resolve in space, time and energy how a spin-orbit-split energy level of an isolated selenium vacancy in a moire-distorted WSe2 monolayer evolves under the controlled excitation of lattice vibrations, using lightwave scanning tunnelling microscopy and spectroscopy. By locally launching a phonon oscillation and taking ultrafast energy-resolved snapshots of the vacancy's states faster than the vibration period, we directly measure the impact of electron-phonon coupling in an isolated single-atom defect. The combination of atomic spatial, sub-picosecond temporal and millielectronvolt energy resolution marks a disruptive development towards a comprehensive understanding of complex quantum materials, where the key microscopic elementary interactions can now be disentangled, one by one. Time-resolved lightwave-driven scanning tunnelling spectroscopy is developed to investigate how the spin-orbit-split energy levels of a selenium vacancy within a WSe2 monolayer shift under phonon displacement. Ultrafast snapshots of the electronic tunnelling spectra reveal transient energy shifts up to 40 meV.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | EXCITONS; MOLECULE; ELECTRON; VISUALIZATION; SPACE; SPIN; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Regensburg Center for UltrafastNanoscopy (RUN) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Jul 2025 13:25 |
| Last Modified: | 14 Jul 2025 13:25 |
| URI: | https://pred.uni-regensburg.de/id/eprint/63348 |
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