Schwenk, Johannes and Kim, Sungmin and Berwanger, Julian and Ghahari, Fereshte and Walkup, Daniel and Slot, Marlou R. and Le, Son T. and Cullen, William G. and Blankenship, Steven R. and Vranjkovic, Sasa and Hug, Hans J. and Kuk, Young and Giessibl, Franz J. and Stroscio, Joseph A. (2020) Achieving mu eV tunneling resolution in an in-operando scanning tunneling microscopy, atomic force microscopy, and magnetotransport system for quantum materials research. REVIEW OF SCIENTIFIC INSTRUMENTS, 91 (7): 071101. ISSN 0034-6748, 1089-7623
Full text not available from this repository. (Request a copy)Abstract
Research in new quantum materials requires multi-mode measurements spanning length scales, correlations of atomic-scale variables with a macroscopic function, and spectroscopic energy resolution obtainable only at millikelvin temperatures, typically in a dilution refrigerator. In this article, we describe a multi-mode instrument achieving a mu eV tunneling resolution with in-operando measurement capabilities of scanning tunneling microscopy, atomic force microscopy, and magnetotransport inside a dilution refrigerator operating at 10 mK. We describe the system in detail including a new scanning probe microscope module design and sample and tip transport systems, along with wiring, radio-frequency filtering, and electronics. Extensive benchmarking measurements were performed using superconductor-insulator-superconductor tunnel junctions, with Josephson tunneling as a noise metering detector. After extensive testing and optimization, we have achieved less than 8 mu eV instrument resolving capability for tunneling spectroscopy, which is 5-10 times better than previous instrument reports and comparable to the quantum and thermal limits set by the operating temperature at 10 mK.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GRAPHENE; SPECTROSCOPY; FILTERS; SENSOR; PROBE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Franz J. Giessibl |
| Depositing User: | Petra Gürster |
| Date Deposited: | 14 Apr 2021 06:43 |
| Last Modified: | 14 Apr 2021 06:43 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44284 |
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