Gate-Tunable Photoresponse of Graphene Josephson Junctions at Terahertz Frequencies
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2026
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866915904421363712 |
|---|---|
| author | Zhou, X. Gayduchenko, I. Kudriashov, A. Shein, K. Kuksov, A. Elesin, L. Kravtsov, M. Shilov, A. Popova, O. Jana, S. Taniguchi, T. Watanabe, K. Goltsman, G. Novoselov, K. Bandurin, D. A. |
| author_facet | Zhou, X. Gayduchenko, I. Kudriashov, A. Shein, K. Kuksov, A. Elesin, L. Kravtsov, M. Shilov, A. Popova, O. Jana, S. Taniguchi, T. Watanabe, K. Goltsman, G. Novoselov, K. Bandurin, D. A. |
| contents | Graphene Josephson junctions (JJ) provide a promising platform for ultra-broadband quantum sensing of light owing to graphene's frequency-independent absorption, vanishing electronic heat capacity, and weak electron-phonon coupling, which enable rapid suppression of the critical current through radiation-induced electron heating. Existing investigations have been confined to the microwave and infrared regimes, where competing detector technologies are already established; by contrast, the terahertz (THz) band - where sensitivity is most urgently lacking and no mature quantum sensor exists - has remained largerly unexplored. Here we demonstrate a strong photoresponse of graphene JJs at THz frequencies, establishing a first experimental step towards graphene-based THz quantum sensors. Under low-intensity illumination, we observe a pronounced suppression of the critical current that generates a strong photovoltage (Vph) under current bias. By tracking this Vph and independently measuring the electron temperature as a function of absorbed power, we extract a responsivity of 88 kV W^-1 and a noise-equivalent power of 45 aW Hz^-1/2 at 1.7 K. Furthermore, gate tunability of our JJ enables access to a regime where hysteretic current-voltage characteristics persist up to 0.9 K, offering a potential route toward single-photon THz detection beyond millikelvin (mK) temperatures. These findings establish graphene JJ as a versatile platform for broadband cryogenic radiation sensing and point towards their use as quantum sensors at THz frequencies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_00409 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Gate-Tunable Photoresponse of Graphene Josephson Junctions at Terahertz Frequencies Zhou, X. Gayduchenko, I. Kudriashov, A. Shein, K. Kuksov, A. Elesin, L. Kravtsov, M. Shilov, A. Popova, O. Jana, S. Taniguchi, T. Watanabe, K. Goltsman, G. Novoselov, K. Bandurin, D. A. Mesoscale and Nanoscale Physics N/A J.2 Graphene Josephson junctions (JJ) provide a promising platform for ultra-broadband quantum sensing of light owing to graphene's frequency-independent absorption, vanishing electronic heat capacity, and weak electron-phonon coupling, which enable rapid suppression of the critical current through radiation-induced electron heating. Existing investigations have been confined to the microwave and infrared regimes, where competing detector technologies are already established; by contrast, the terahertz (THz) band - where sensitivity is most urgently lacking and no mature quantum sensor exists - has remained largerly unexplored. Here we demonstrate a strong photoresponse of graphene JJs at THz frequencies, establishing a first experimental step towards graphene-based THz quantum sensors. Under low-intensity illumination, we observe a pronounced suppression of the critical current that generates a strong photovoltage (Vph) under current bias. By tracking this Vph and independently measuring the electron temperature as a function of absorbed power, we extract a responsivity of 88 kV W^-1 and a noise-equivalent power of 45 aW Hz^-1/2 at 1.7 K. Furthermore, gate tunability of our JJ enables access to a regime where hysteretic current-voltage characteristics persist up to 0.9 K, offering a potential route toward single-photon THz detection beyond millikelvin (mK) temperatures. These findings establish graphene JJ as a versatile platform for broadband cryogenic radiation sensing and point towards their use as quantum sensors at THz frequencies. |
| title | Gate-Tunable Photoresponse of Graphene Josephson Junctions at Terahertz Frequencies |
| topic | Mesoscale and Nanoscale Physics N/A J.2 |
| url | https://arxiv.org/abs/2604.00409 |