Onyszczak Michael, Uzan-Narovlansky Ayelet J, Tang Yue, Wang Pengjie, Jia Yanyu, Yu Guo, Song Tiancheng, Singha Ratnadwip, Khoury Jason F, Schoop Leslie M, Wu Sanfeng
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Department of Electrical and Computer Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Rev Sci Instrum. 2023 Oct 1;94(10). doi: 10.1063/5.0160321.
Optical spectroscopy of quantum materials at ultralow temperatures is rarely explored, yet it may provide critical characterizations of quantum phases not possible using other approaches. We describe the development of a novel experimental platform that enables optical spectroscopic studies, together with standard electronic transport, of materials at millikelvin temperatures inside a dilution refrigerator. The instrument is capable of measuring both bulk crystals and micrometer-sized two-dimensional van der Waals materials and devices. We demonstrate its performance by implementing photocurrent-based Fourier transform infrared spectroscopy on a monolayer WTe2 device and a multilayer 1T-TaS2 crystal, with a spectral range available from the near-infrared to the terahertz regime and in magnetic fields up to 5 T. In the far-infrared regime, we achieve spectroscopic measurements at a base temperature as low as ∼43 mK and a sample electron temperature of ∼450 mK. Possible experiments and potential future upgrades of this versatile instrumental platform are envisioned.
极低温下量子材料的光谱学研究鲜有探索，然而它可能提供用其他方法无法实现的量子相的关键表征。我们描述了一种新型实验平台的开发，该平台能够在稀释制冷机内的毫开尔文温度下对材料进行光学光谱研究以及标准电子输运研究。该仪器能够测量块状晶体以及微米级二维范德华材料和器件。我们通过在单层WTe2器件和多层1T-TaS2晶体上实施基于光电流的傅里叶变换红外光谱来展示其性能，光谱范围从近红外到太赫兹波段，磁场强度可达5 T。在远红外波段，我们在低至约43 mK的基温和约450 mK的样品电子温度下实现了光谱测量。我们设想了这个多功能仪器平台可能进行的实验以及未来潜在的升级。
