Superconducting magnet cryostat system for terahertz spectroscopy

用于太赫兹光谱的超导磁体低温恒温器系统

• 批准号: 495542626
• 金额: --
• 依托单位: Technische Universität Dortmund
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/495542626?language=en
• 关键词: Superconducting; magnet; cryostat; system; terahertz

The superconducting magnet cryostat system requested by the group of Prof. Lange allows for the investigation of ultrastrongly and deep-strongly light-matter coupled cavity quantum electrodynamical (c-QED) structures in the terahertz (THz) spectral range. Tailoring near fields of THz modes by quantitative, parameter-free numerical simulations, our group designs and fabricates light-matter coupled structures for c-QED experiments, as well as near-field enhancing resonators enabling THz experiments with atomically strong fields. This subwavelength control of electromagnetic fields plays a central role for our group’s aim to investigate extreme limits of light-matter interaction in which optical nonlinearities occur on time scales significantly shorter than a single cycle of light. Recent research highlights include nonlinearities of Landau electrons beyond Kohn’s theorem, the observation of dynamical Bloch oscillations and high-harmonics generation, lightwave acceleration of Dirac electrons in topological insulators, minimally dissipative spin switching in antenna-enhanced THz near fields, non-adiabatic control of deep-strongly light-matter coupled electrons in switchable THz resonators, and the observation of carrier-wave Rabi flopping of ultrastrongly coupled resonances.The requested magnet cryostat will allow us to continue this research and explore novel directions of THz subcycle physics in condensed-matter systems. The system’s key features include magnetic fields of up to 6 T while providing an exceptionally large and symmetric optical aperture corresponding to an opening angle of 45°, permitting tight focusing and thus strong THz field amplitudes, in the focal plane. These properties will enable the investigation of strong-field THz dynamics in magnetic fields, which in particular concerns our Landau polariton c-QED systems. Here, we aim for previously inaccessible light-matter coupling strengths, where the vacuum Rabi frequency significantly exceeds the carrier frequency of light. Furthermore, we will explore novel c-QED concepts including superconducting resonators or atomically thin materials such as transition metal dichalcogenides, in magnetic fields. Transitioning from linear to non-perturbatively nonlinear dynamics, we expect to unveil novel phenomena including high-order nonlinearities, generation of non-classical light, resonances generated by nonlinear interactions of cavity polaritons, or phase transitions.

Lange 教授团队要求的超导磁体低温恒温器系统可以研究太赫兹 (THz) 光谱范围内的超强和深强光物质耦合腔量子电动力学 (c-QED) 结构。通过定量、无参数数值模拟，我们的团队设计并制造了用于 c-QED 实验的光-物质耦合结构，以及支持太赫兹实验的近场增强谐振器这种电磁场的亚波长控制对于我们小组研究光与物质相互作用的极端极限起着核心作用，其中光学非线性发生在比单个光周期短得多的时间尺度上。最近的研究亮点包括非线性。超越科恩定理的朗道电子、动态布洛赫振荡和高次谐波产生的观察、拓扑绝缘体中狄拉克电子的光波加速，最低限度天线增强太赫兹近场中的耗散自旋切换，可切换太赫兹谐振器中深强光物质耦合电子的非绝热控制，以及超强耦合谐振的载波拉比跳变的观察。所需的磁体低温恒温器将使我们能够继续这项研究并探索凝聚态物质系统中太赫兹次循环物理的新方向。该系统的主要特点包括高达 6 T 的磁场，同时提供异常大的磁场。和对应于 45° 开角的对称光学孔径，允许在焦平面上紧密聚焦，从而实现强太赫兹场振幅，这些特性将使研究磁场中的强场太赫兹动力学成为可能，这尤其涉及我们的朗道。在这里，我们的目标是以前无法达到的光-物质耦合强度，其中真空拉比频率显着超过光的载波频率此外，我们将探索包括超导在内的新颖的c-QED概念。谐振器或原子薄材料（例如过渡金属二硫化物）在磁场中从线性动力学过渡到非扰动非线性动力学，我们期望揭示新的现象，包括高阶非线性、非经典光的产生、非线性相互作用产生的共振。空腔极化子，或相变。