Langer, F. and Hohenleutner, M. and Schmid, C. P. and Poellmann, C. and Nagler, P. and Korn, T. and Schueller, C. and Sherwin, M. S. and Huttner, U. and Steiner, J. T. and Koch, S. W. and Kira, M. and Huber, R. (2016) Lightwave-driven quasiparticle collisions on a subcycle timescale. NATURE, 533 (7602). 225-+. ISSN 0028-0836, 1476-4687
Full text not available from this repository. (Request a copy)Abstract
Ever since Ernest Rutherford scattered alpha-particles from gold foils(1), collision experiments have revealed insights into atoms, nuclei and elementary particles(2). In solids, many-body correlations lead to characteristic resonances(3)-called quasiparticles-such as excitons, dropletons(4), polarons and Cooper pairs. The structure and dynamics of quasiparticles are important because they define macroscopic phenomena such as Mott insulating states, spontaneous spin-and charge-order, and high-temperature superconductivity(5). However, the extremely short lifetimes of these entities(6) make practical implementations of a suitable collider challenging. Here we exploit lightwave-driven charge transport(7-24), the foundation of attosecond science(9-13), to explore ultrafast quasiparticle collisions directly in the time domain: a femtosecond optical pulse creates excitonic electron-hole pairs in the layered dichalcogenide tungsten diselenide while a strong terahertz field accelerates and collides the electrons with the holes. The underlying dynamics of the wave packets, including collision, pair annihilation, quantum interference and dephasing, are detected as light emission in high-order spectral sidebands(17-19) of the optical excitation. A full quantum theory explains our observations microscopically. This approach enables collision experiments with various complex quasiparticles and suggests a promising new way of generating sub-femtosecond pulses.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HIGH-HARMONIC-GENERATION; SIDE-BAND GENERATION; MANY-BODY; SEMICONDUCTORS; WSE2; SPECTROSCOPY; MONOLAYER; ELECTRONS; DYNAMICS; EXCITONS; |
| 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: | 22 Mar 2019 10:08 |
| Last Modified: | 22 Mar 2019 10:08 |
| URI: | https://pred.uni-regensburg.de/id/eprint/2937 |
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