On-Chip Terahertz Spectroscopy for Dual-Gated van der Waals Heterostructures at Cryogenic Temperatures
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866929589470625792 |
|---|---|
| author | Seo, Junseok Lu, Zhengguang Park, Seunghyun Yang, Jixiang Xia, Fangzhou Ye, Shenyong Yao, Yuxuan Han, Tonghang Shi, Lihan Watanabe, Kenji Taniguchi, Takashi Yacoby, Amir Ju, Long |
| author_facet | Seo, Junseok Lu, Zhengguang Park, Seunghyun Yang, Jixiang Xia, Fangzhou Ye, Shenyong Yao, Yuxuan Han, Tonghang Shi, Lihan Watanabe, Kenji Taniguchi, Takashi Yacoby, Amir Ju, Long |
| contents | Van der Waals heterostructures have emerged as a versatile platform to study correlated and topological electron physics. Spectroscopy experiments in the THz regime are crucial, since the energy of THz photons matches that of relevant excitations and charge dynamics. However, their micron-size and complex (dual-)gated structures have challenged such measurements. Here, we demonstrate on-chip THz spectroscopy on a dual-gated bilayer graphene device at liquid helium temperature. To avoid unwanted THz absorption by metallic gates, we developed a scheme of operation by combining semiconducting gates and optically controlled gating. This allows us to measure the clean THz response of graphene without being affected by the gates. We observed the THz signatures of electric-field-induced bandgap opening at the charge neutrality. We measured Drude conductivities at varied charge densities and extracted key parameters, including effective masses and scattering rates. This work paves the way for studying novel emergent phenomena in dual-gated two-dimensional materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_19726 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On-Chip Terahertz Spectroscopy for Dual-Gated van der Waals Heterostructures at Cryogenic Temperatures Seo, Junseok Lu, Zhengguang Park, Seunghyun Yang, Jixiang Xia, Fangzhou Ye, Shenyong Yao, Yuxuan Han, Tonghang Shi, Lihan Watanabe, Kenji Taniguchi, Takashi Yacoby, Amir Ju, Long Mesoscale and Nanoscale Physics Materials Science Van der Waals heterostructures have emerged as a versatile platform to study correlated and topological electron physics. Spectroscopy experiments in the THz regime are crucial, since the energy of THz photons matches that of relevant excitations and charge dynamics. However, their micron-size and complex (dual-)gated structures have challenged such measurements. Here, we demonstrate on-chip THz spectroscopy on a dual-gated bilayer graphene device at liquid helium temperature. To avoid unwanted THz absorption by metallic gates, we developed a scheme of operation by combining semiconducting gates and optically controlled gating. This allows us to measure the clean THz response of graphene without being affected by the gates. We observed the THz signatures of electric-field-induced bandgap opening at the charge neutrality. We measured Drude conductivities at varied charge densities and extracted key parameters, including effective masses and scattering rates. This work paves the way for studying novel emergent phenomena in dual-gated two-dimensional materials. |
| title | On-Chip Terahertz Spectroscopy for Dual-Gated van der Waals Heterostructures at Cryogenic Temperatures |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2409.19726 |