Guardado en:
| Autores principales: | , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2508.19063 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866908504485265408 |
|---|---|
| author | Huber, Olivier Kuhlbrodt, Kilian Anderson, Eric Li, Weijie Watanabe, Kenji Taniguchi, Takashi Kroner, Martin Xu, Xiaodong Imamoglu, Atac Smolenski, Tomasz |
| author_facet | Huber, Olivier Kuhlbrodt, Kilian Anderson, Eric Li, Weijie Watanabe, Kenji Taniguchi, Takashi Kroner, Martin Xu, Xiaodong Imamoglu, Atac Smolenski, Tomasz |
| contents | Controlling quantum matter with light offers a promising route to dynamically tune its many-body properties, ranging from band topology to superconductivity. However, achieving such optical control for strongly correlated electron systems in the steady-state has remained elusive. Here, we demonstrate all-optical switching of the spin-valley degree of freedom of itinerant ferromagnets in twisted MoTe2 homobilayers. This system uniquely features flat valley-contrasting Chern bands and exhibits a range of strongly correlated phases at various moiré lattice fillings, including Chern insulators and ferromagnetic metals. We show that the spin-valley orientation of all of these phases can be dynamically reversed by resonantly exciting the attractive polaron transition with circularly-polarized light. These findings not only constitute the first direct evidence for non-thermal switching of a ferromagnetic spin state at zero magnetic field, but also demonstrate the possibility of dynamical control over topological order parameter, paving the way for all-optical generation of chiral edge modes and topological quantum circuits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_19063 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical control over topological Chern number in moiré materials Huber, Olivier Kuhlbrodt, Kilian Anderson, Eric Li, Weijie Watanabe, Kenji Taniguchi, Takashi Kroner, Martin Xu, Xiaodong Imamoglu, Atac Smolenski, Tomasz Mesoscale and Nanoscale Physics Strongly Correlated Electrons Controlling quantum matter with light offers a promising route to dynamically tune its many-body properties, ranging from band topology to superconductivity. However, achieving such optical control for strongly correlated electron systems in the steady-state has remained elusive. Here, we demonstrate all-optical switching of the spin-valley degree of freedom of itinerant ferromagnets in twisted MoTe2 homobilayers. This system uniquely features flat valley-contrasting Chern bands and exhibits a range of strongly correlated phases at various moiré lattice fillings, including Chern insulators and ferromagnetic metals. We show that the spin-valley orientation of all of these phases can be dynamically reversed by resonantly exciting the attractive polaron transition with circularly-polarized light. These findings not only constitute the first direct evidence for non-thermal switching of a ferromagnetic spin state at zero magnetic field, but also demonstrate the possibility of dynamical control over topological order parameter, paving the way for all-optical generation of chiral edge modes and topological quantum circuits. |
| title | Optical control over topological Chern number in moiré materials |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.19063 |