Freudenstein, J. and Borsch, M. and Meierhofer, M. and Afanasiev, D. and Schmid, C. P. and Sandner, F. and Liebich, M. and Girnghuber, A. and Knorr, M. and Kira, M. and Huber, R. (2022) Attosecond clocking of correlations between Bloch electrons. NATURE, 610 (7931). pp. 290-295. ISSN 0028-0836, 1476-4687
Full text not available from this repository. (Request a copy)Abstract
Delocalized Bloch electrons and the low-energy correlations between them determine key optical(1), electronic(2) and entanglement(3) functionalities of solids, all the way through to phase transitions(4,5). To directly capture how many-body correlations affect the actual motion of Bloch electrons, subfemtosecond (1 fs = 10(-15) s) temporal precision(6-15) is desirable. Yet, probing with attosecond (1 as = 10(-18) s) high-energy photons has not been energy-selective enough to resolve the relevant millielectronvolt-scale interactions of electrons(1-5,16,17) near the Fermi energy. Here, we use multi-terahertz light fields to force electron-hole pairs in crystalline semiconductors onto closed trajectories, and clock the delay between separation and recollision with 300 as precision, corresponding to 0.7% of the driving field's oscillation period. We detect that strong Coulomb correlations emergent in atomically thin WSe2 shift the optimal timing of recollisions by up to 1.2 +/- 0.3 fs compared to the bulk material. A quantitative analysis with quantum-dynamic many-body computations in a Wigner-function representation yields a direct and intuitive view on how the Coulomb interaction, non-classical aspects, the strength of the driving field and the valley polarization influence the dynamics. The resulting attosecond chronoscopy of delocalized electrons could revolutionize the understanding of unexpected phase transitions and emergent quantum-dynamic phenomena for future electronic, optoelectronic and quantum-information technologies.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHOTOEMISSION; MONOLAYER; MATTER; LIGHT |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Feb 2024 10:30 |
| Last Modified: | 07 Feb 2024 10:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57226 |
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