Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.25: Poster
Montag, 18. März 2024, 15:00–18:00, Poster C
Optical Scanning Tunneling Microscopy at Low Temperature — •Pegah Farahi Shandiz1,2, Alexina Ollier1,3, Lei Fang1,3, Won-jun Jang1,3, Soonhyeong Lee1,3, Sangwon Yoon1,3, Minsu Seo1,3, and Andreas Heinrich1,2 — 1Center for Quantum Nanoscience, Institute for Basic Science, Seoul 03760, South Korea — 2Department of Physics, Ewha Womans University, Seoul 03760, South Korea — 3Ewha Womans University, Seoul 03760, South Korea
Advances in fabricating atomic scale structure opened up new possibilities. One of interest is the optical properties. Recent experiments on nanomaterial shows that the optical properties vary drastically from bulk to nanoscale such as absorption, reflection, and light emission. These open up new avenues for technological advancements in various fields, such as electronics, energy, medicine, and quantum communication applications. Understanding the properties of such material at atomic scale involves the development of techniques capable of atomic resolution. The STM junction reveals itself as a solution and proves advantageous. Indeed, placing the STM tip in close proximity to a specific area on the sample allows localized optical interactions .Integrating the principles of STM and optical spectroscopy gain insights into electronic, vibrational, and even photonic properties with unprecedented precision. Here, we present a home built optical STM, engineered to conduct measurements at low temperature (1K) under UHV. The optical STM is incorporated with a homebuilt Joule-Thomson refrigerator to enhance spatial resolution, stability, and reveal quantum phenomena.
Keywords: Ultra-high vacuum; Optical Scanning Tunneling Microscopy; Joule-Thomson refrigerator