Imaging propagating terahertz collective modes in two-dimensional semiconductor double layers
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866914173717315584 |
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| author | Pierce, Andrew T. Vaswani, Chirag Pimenov, Dimitri Xu, Sihong Watanabe, Kenji Taniguchi, Takashi Mueller, Erich Chowdhury, Debanjan Mak, Kin Fai Shan, Jie |
| author_facet | Pierce, Andrew T. Vaswani, Chirag Pimenov, Dimitri Xu, Sihong Watanabe, Kenji Taniguchi, Takashi Mueller, Erich Chowdhury, Debanjan Mak, Kin Fai Shan, Jie |
| contents | Two-dimensional transition metal dichalcogenide (TMD) semiconductors exhibit a wide range of novel phenomena at millielectronvolt (terahertz-frequency) energy scales, including superconducting and correlation-induced insulating gaps that are frequently accompanied by symmetry breaking. However, due to the subwavelength dimensions and the often low conductivities of these systems, their intrinsic THz plasmons and meV-scale excitation gaps are difficult to access experimentally. Here we report an optical readout method that can image propagating THz-frequency collective modes in real time. The method relies on a strong coupling between the optical polarons of monolayer TMD semiconductors and the local THz fields in a waveguide, which enables us to image THz plasmons with micron scale spatial resolution and determine their propagation group velocities. Moreover, at finite magnetic fields, we observe coherent cyclotron oscillations resulting from Landau level repopulation induced by the THz field. Our findings provide a new near-field platform for probing collective excitations in strongly correlated two-dimensional semiconductors and enable "all-photonic" TMD-based architectures for time-domain THz plasmonics and optoelectronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_22962 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Imaging propagating terahertz collective modes in two-dimensional semiconductor double layers Pierce, Andrew T. Vaswani, Chirag Pimenov, Dimitri Xu, Sihong Watanabe, Kenji Taniguchi, Takashi Mueller, Erich Chowdhury, Debanjan Mak, Kin Fai Shan, Jie Mesoscale and Nanoscale Physics Materials Science Two-dimensional transition metal dichalcogenide (TMD) semiconductors exhibit a wide range of novel phenomena at millielectronvolt (terahertz-frequency) energy scales, including superconducting and correlation-induced insulating gaps that are frequently accompanied by symmetry breaking. However, due to the subwavelength dimensions and the often low conductivities of these systems, their intrinsic THz plasmons and meV-scale excitation gaps are difficult to access experimentally. Here we report an optical readout method that can image propagating THz-frequency collective modes in real time. The method relies on a strong coupling between the optical polarons of monolayer TMD semiconductors and the local THz fields in a waveguide, which enables us to image THz plasmons with micron scale spatial resolution and determine their propagation group velocities. Moreover, at finite magnetic fields, we observe coherent cyclotron oscillations resulting from Landau level repopulation induced by the THz field. Our findings provide a new near-field platform for probing collective excitations in strongly correlated two-dimensional semiconductors and enable "all-photonic" TMD-based architectures for time-domain THz plasmonics and optoelectronics. |
| title | Imaging propagating terahertz collective modes in two-dimensional semiconductor double layers |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2511.22962 |