Optical Control of Slow Topological Electrons in Moiré Systems
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1.
California Institute of Technology
Abstract
Floquet moiré materials possess optically-induced flat-electron bands with steady-states sensitive to drive parameters. Within this regime, we show that strong interaction screening and phonon bath coupling can overcome enhanced drive-induced heating. In twisted bilayer graphene (TBG) irradiated by a terahertz-frequency continuous circularly polarized laser, the extremely slow electronic states enable the drive to control the steady state occupation of high-Berry curvature electronic states. In particular, above a critical field amplitude, high-Berry-curvature states exhibit a slow regime where they decouple from acoustic phonons, allowing the drive to control the anomalous Hall response. Our work shows that the laser-induced control of topological and transport physics in Floquet TBG are measurable using experimentally available probes.
Copyright and License
© 2023 American Physical Society.
Acknowledgement
We thank Netanel Lindner, Mark Rudner, Or Katz, Gaurav Gupta, Seamus O'Hara, Jason Alicea, Alex Thomson, Felix von Oppen, Kryštof Kolář, Étienne Lantagne-Hurtubise, and Valerio Peri for valuable discussions. C. Y. gratefully acknowledges support from the DOE NNSA Stewardship Science Graduate Fellowship program, which is provided under cooperative Agreement No. DE-NA0003960. C. L. acknowledges support by the Gordon and Betty Moore Foundation's EPiQS Initiative, Grant GBMF8682, start-up funds from Florida State University and the National High Magnetic Field Laboratory. The National High Magnetic Field Laboratory is supported by the National Science Foundation through NSF/DMR-1644779 and the State of Florida. G. R. and I. E. are grateful for support from the Simons Foundation and the Institute of Quantum Information and Matter, as well as support from the NSF DMR Grant No. 1839271. This work is supported by ARO MURI Grant No. W911NF-16-1-0361, and was performed in part at the Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.
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Additional details
- ISSN
- 1079-7114
- National Nuclear Security Administration
- DE-NA0003960
- Gordon and Betty Moore Foundation
- GBMF8682
- Florida State University
- National High Magnetic Field Laboratory
- National Science Foundation
- PHY-1607611
- Simons Foundation
- Institute for Quantum Information and Matter, California Institute of Technology
- National Science Foundation
- DMR-1839271
- United States Army Research Office
- W911NF-16-1-0361
- National Science Foundation
- PHY-1607611
- Caltech groups
- Institute for Quantum Information and Matter