稀释冰箱
扫描隧道显微镜
材料科学
扫描电子显微镜
超导电性
光电子学
量子隧道
扫描隧道光谱
冷藏车
分析化学(期刊)
光学
凝聚态物理
纳米技术
物理
化学
复合材料
热力学
色谱法
作者
Ungdon Ham,Hyeonjung Kim,Ji-Soo Yoon,Wooin Yang,Tae-Hwan Kim,Jinho Lee,Han Woong Yeom
摘要
This study presents a newly constructed dilution-refrigerator ultrahigh vacuum (UHV) scanning tunneling microscope (STM) with a 9/2/2 T superconducting vector magnet capable of achieving electron temperatures as low as 76 mK. Our design emphasizes robust thermal contacts, particularly with the sample holder through a thin insulating layer. Additionally, we focus on effective shielding and grounding against radio-frequency electromagnetic interference by integrating the critical electronics as a physically and electrically integral component of the STM setup. Scanning tunneling spectroscopy results obtained from a superconducting aluminum substrate and a gold tip indicate superior energy resolution, with a higher aspect ratio of the superconducting coherence peak in the dI/dV spectra compared to other dilution-refrigerator UHV STMs. Given that only a handful of UHV STMs with dilution refrigerators have reached electron temperatures below 100 mK, these results demonstrate the effectiveness of our design and methodology in achieving low electron temperatures.
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