Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands
Name
PhysRevLett.126.256803.pdf
Description
Published version
Size
540.24 KB
Format
Adobe PDF
Checksum (MD5)
4a50dffa6a017ce946bf3049d164dda4
Author(s)
Fahimniya, Ali
Dong, Zhiyu
Kiselev, Egor I
Levitov, Leonid
Date Issued
2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Fahimniya, Ali, Dong, Zhiyu, Kiselev, Egor I and Levitov, Leonid. 2021. "Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands." Physical Review Letters, 126 (25).
Version
Final published version
Abstract
Achieving Bloch oscillations of free carriers under a direct current, a long-sought-after collective many-body behavior, has been challenging due to stringent constraints on the band properties. We argue that the flat bands in moiré graphene fulfill the basic requirements for observing Bloch oscillations, offering an appealing alternative to the stacked quantum wells used in previous work aiming to access this regime. Bloch-oscillating moiré superlattices emit a comblike spectrum of incommensurate frequencies, a property of interest for converting direct currents into high-frequency currents and developing broadband amplifiers in terahertz domain. The oscillations can be synchronized through coupling to an oscillator mode in a photonic or plasmonic resonator. Phase-coherent collective oscillations in the resonant regime provide a realization of current-pumped terahertz lasing.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.126.256803
