Cryogen-free modular scanning tunneling microscope operating at 4-K in high magnetic field on a compact ultra-high vacuum platform
arxiv(2024)
摘要
One of the daunting challenges in modern low temperature scanning tunneling
microscopy (STM) is the difficulty of combining atomic resolution with cryogen
free cooling. Further functionality needs, such as ultra-high vacuum (UHV),
high magnetic field, and compatibility with μm-sized samples, pose
additional challenges to an already ambitious build. We present the design,
construction, and performance of a cryogen free, UHV, low temperature, and high
magnetic field system for modular STM operation. An internal vibration isolator
reduces vibrations in this system allowing atomic resolution STM imaging while
maintaining a low base temperature of 4K and magnetic fields up to 9T. Samples
and tips can be conditioned in-situ utilizing a heating stage, an ion
sputtering gun, an e-beam evaporator, a tip treater, and sample exfoliation.
In-situ sample and tip exchange and alignment are performed in a connected UHV
room temperature stage with optical access. Multisite operation without
breaking vacuum is enabled by a unique quick-connect STM head design. A novel
low-profile vertical transfer mechanism permits transferring the STM between
room temperature and the low temperature cryostat.
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