http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Home-built sub-Kelvin scanning tunneling microscope with electron spin resonance capability
Jiyoon Hwang,Denis Krylov,Taehong Ahn,Lei Fang,Kyungju Noh,Andreas J. Heinrich,Yujeong Bae 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Scanning tunneling microscopy is a powerful tool to characterize the electronic and magnetic properties of atomic scale structures on a surface. Recent advances in increasing energy resolutions have been achieved functionalizing the STM tip by a well-characterized molecule [1,2] or integrating electron spin resonance with STM (ESR-STM) [3]. We present the design and performance of home-built STM with high frequency cabling, which is incorporated with a Joule-Thomson refrigerator and 2-axes vector magnets. Applying high frequency (microwave) electric fields to the STM junction through 50 Ohm coaxial cables causes significant loss of insertion power due to the impedance mismatch at the STM junction of ~1 GOhm, which limits the frequency range of applicable microwaves. To overcome this limitation, we introduced a microwave antenna and terminated the cable at 50 Ohm. Applying microwaves to the antenna rather than the STM tip allows us to reduce the formation of standing waves as well as to increase the transmission. Our work shows using the specially designed mechanical damper and optimizing the electrical noise levels provide the outstanding performance of STM for the single atom ESR experiment.