Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands
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 oscilla...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/142068 |
| _version_ | 1826218096342335488 |
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| author | Fahimniya, Ali Dong, Zhiyu Kiselev, Egor I Levitov, Leonid |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Fahimniya, Ali Dong, Zhiyu Kiselev, Egor I Levitov, Leonid |
| author_sort | Fahimniya, Ali |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T17:14:07Z |
| format | Article |
| id | mit-1721.1/142068 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T17:14:07Z |
| publishDate | 2022 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1420682023-01-27T18:38:23Z Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands Fahimniya, Ali Dong, Zhiyu Kiselev, Egor I Levitov, Leonid Massachusetts Institute of Technology. Department of Physics 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. 2022-04-25T18:46:04Z 2022-04-25T18:46:04Z 2021 2022-04-25T18:40:13Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142068 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). en 10.1103/PHYSREVLETT.126.256803 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Fahimniya, Ali Dong, Zhiyu Kiselev, Egor I Levitov, Leonid Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands |
| title | Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands |
| title_full | Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands |
| title_fullStr | Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands |
| title_full_unstemmed | Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands |
| title_short | Synchronizing Bloch-Oscillating Free Carriers in Moiré Flat Bands |
| title_sort | synchronizing bloch oscillating free carriers in moire flat bands |
| url | https://hdl.handle.net/1721.1/142068 |
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