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教授小组要求的超导磁体低温恒温器系统允许在太赫兹（THz）光谱范围内研究超强和深强轻物质耦合腔量子电动力学（c-QED）结构。通过定量，无参数的数值模拟来定制THz模式的近场，我们的团队设计和制造了用于c-QED实验的轻物质耦合结构，以及近场增强谐振器，使THz实验具有原子强场。这种电磁场的亚波长控制对我们小组的目标起着核心作用，即研究光-物质相互作用的极端极限，其中光学非线性发生在明显短于单个光周期的时间尺度上。最近的研究重点包括朗道电子的非线性超越Kohn定理，动态Bloch振荡和高次谐波产生的观察，拓扑绝缘体中Dirac电子的光波加速，天线增强THz近场中的最小耗散自旋开关，可开关THz谐振器中深度强光物质耦合电子的非绝热控制，所要求的磁体低温恒温器将使我们能够继续这项研究，并探索凝聚态系统中太赫兹子循环物理的新方向。该系统的主要特征包括高达6 T的磁场，同时提供对应于45°开度角的超大对称光学孔径，从而在焦平面中实现紧密聚焦和强THz场振幅。这些性质将使磁场中的强场太赫兹动力学的调查，特别是我们的朗道极化激元c-QED系统。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，我们将探索新的c-QED概念，包括超导谐振器或原子薄的材料，如过渡金属二硫属化物，在磁场中。从线性过渡到非微扰非线性动力学，我们期望揭示新的现象，包括高阶非线性，非经典光的产生，共振腔极化激元的非线性相互作用产生的，或相变。