Schmid, C. P. and Weigl, L. and Groessing, P. and Junk, V and Gorini, C. and Schlauderer, S. and Ito, S. and Meierhofer, M. and Hofmann, N. and Afanasiev, D. and Crewse, J. and Kokh, K. A. and Tereshchenko, O. E. and Guedde, J. and Evers, F. and Wilhelm, J. and Richter, K. and Hoefer, U. and Huber, R. (2021) Tunable non-integer high-harmonic generation in a topological insulator. NATURE, 593 (7859). pp. 385-390. ISSN 0028-0836, 1476-4687
Full text not available from this repository. (Request a copy)Abstract
When intense lightwaves accelerate electrons through a solid, the emerging high-order harmonic (HH) radiation offers key insights into the material(1-11). Sub-optical-cycle dynamics-such as dynamical Bloch oscillations(2-5), quasiparticle collisions(6,12), valley pseudospin switching(13) and heating of Dirac gases(10)-leave fingerprints in the HH spectra of conventional solids. Topologically non-trivial matter(14,15) with invariants that are robust against imperfections has been predicted to support unconventional HH generation(16-20). Here we experimentally demonstrate HH generation in a three-dimensional topological insulator-bismuth telluride. The frequency of the terahertz driving field sharply discriminates between HH generation from the bulk and from the topological surface, where the unique combination of long scattering times owing to spin-momentum locking(17) and the quasi-relativistic dispersion enables unusually efficient HH generation. Intriguingly, all observed orders can be continuously shifted to arbitrary non-integer multiples of the driving frequency by varying the carrier-envelope phase of the driving field-in line with quantum theory. The anomalous Berry curvature warranted by the non-trivial topology enforces meandering ballistic trajectories of the Dirac fermions, causing a hallmark polarization pattern of the HH emission. Our study provides a platform to explore topology and relativistic quantum physics in strong-field control, and could lead to non-dissipative topological electronics at infrared frequencies.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SURFACE; STATES; BLOCH |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Aug 2022 08:49 |
| Last Modified: | 10 Aug 2022 08:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/46278 |
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