Cavity-Mediated Coupling between Local and Nonlocal Modes in Landau Polaritons
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918137266438144 |
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| author | Endo, Sae R. Kim, Dasom Liang, Shuang Lee, Geon Kim, Sunghwan Covarrubias-Morales, Alan Seo, Minah Manfra, Michael J. Lee, Dukhyung Bamba, Motoaki Kono, Junichiro |
| author_facet | Endo, Sae R. Kim, Dasom Liang, Shuang Lee, Geon Kim, Sunghwan Covarrubias-Morales, Alan Seo, Minah Manfra, Michael J. Lee, Dukhyung Bamba, Motoaki Kono, Junichiro |
| contents | The multimode ultrastrong coupling (USC) regime has emerged as a novel platform for accessing previously inaccessible phenomena in cavity quantum electrodynamics. Of particular interest are cavity-mediated correlations between local and nonlocal excitations, or equivalently, between modes at zero and finite in-plane momentum modes, which offer new opportunities for controlling light-matter interactions across space. However, direct experimental evidence of such interactions has remained elusive. Here, we demonstrate nonlocal multimode coupling in a Landau polariton system, where cavity photons simultaneously interact with the zero-momentum cyclotron resonance and finite-momentum magnetoplasmons of a two-dimensional electron gas in a GaAs quantum well. Our slot cavities, with their subwavelength mode volumes, supply in-plane momentum components that enable the excitation of finite-momentum matter modes. Terahertz time-domain magnetospectroscopy measurements reveal a clear splitting of the upper-polariton branch, arising from hybridization between magnetoplasmon modes and the cavity--cyclotron-resonance hybrids. Extracted coupling strengths confirm USC of the cyclotron resonance and strong coupling of the magnetoplasmon modes to the cavity field, respectively. The experimental results are well captured by the multimode Hopfield model and finite-element simulations. These findings establish a pathway for engineering multimode light-matter interactions involving zero- and finite-momentum matter modes in the USC regime. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_05738 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cavity-Mediated Coupling between Local and Nonlocal Modes in Landau Polaritons Endo, Sae R. Kim, Dasom Liang, Shuang Lee, Geon Kim, Sunghwan Covarrubias-Morales, Alan Seo, Minah Manfra, Michael J. Lee, Dukhyung Bamba, Motoaki Kono, Junichiro Quantum Physics Mesoscale and Nanoscale Physics The multimode ultrastrong coupling (USC) regime has emerged as a novel platform for accessing previously inaccessible phenomena in cavity quantum electrodynamics. Of particular interest are cavity-mediated correlations between local and nonlocal excitations, or equivalently, between modes at zero and finite in-plane momentum modes, which offer new opportunities for controlling light-matter interactions across space. However, direct experimental evidence of such interactions has remained elusive. Here, we demonstrate nonlocal multimode coupling in a Landau polariton system, where cavity photons simultaneously interact with the zero-momentum cyclotron resonance and finite-momentum magnetoplasmons of a two-dimensional electron gas in a GaAs quantum well. Our slot cavities, with their subwavelength mode volumes, supply in-plane momentum components that enable the excitation of finite-momentum matter modes. Terahertz time-domain magnetospectroscopy measurements reveal a clear splitting of the upper-polariton branch, arising from hybridization between magnetoplasmon modes and the cavity--cyclotron-resonance hybrids. Extracted coupling strengths confirm USC of the cyclotron resonance and strong coupling of the magnetoplasmon modes to the cavity field, respectively. The experimental results are well captured by the multimode Hopfield model and finite-element simulations. These findings establish a pathway for engineering multimode light-matter interactions involving zero- and finite-momentum matter modes in the USC regime. |
| title | Cavity-Mediated Coupling between Local and Nonlocal Modes in Landau Polaritons |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.05738 |