Achieving μeV tunneling resolution in an in-operando scanning tunneling microscopy, atomic force microscopy, and magnetotransport system for quantum materials research
| Autor: | Franz J. Giessibl, Daniel Walkup, Marlou R. Slot, Son T. Le, Steven R. Blankenship, Joseph A. Stroscio, Young Kuk, Sungmin Kim, Julian Berwanger, Johannes Schwenk, William G. Cullen, Hans J. Hug, Sasa Vranjkovic, Fereshte Ghahari |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science business.industry Resolution (electron density) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Noise (electronics) Article 010305 fluids & plasmas law.invention Scanning probe microscopy Operating temperature law Condensed Matter::Superconductivity 0103 physical sciences Optoelectronics Dilution refrigerator Scanning tunneling microscope Spectroscopy business Instrumentation Quantum tunnelling |
| Zdroj: | Rev Sci Instrum |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/5.0005320 |
| Popis: | Research in new quantum materials requires multi-mode measurements spanning length scales, correlations of atomic-scale variables with 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 μeV tunneling resolution with in-operando measurement capabilities of scanning tunneling microscopy (STM), atomic force microscopy (AFM), and magnetotransport inside a dilution refrigerator operating at 10 mK. We describe the system in detail including a new scanning probe microscope module design, sample and tip transport systems, along with wiring, radio-frequency (RF) filtering, and electronics. Extensive benchmarking measurements were performed using superconductor-insulator-superconductor (SIS) tunnel junctions, with Josephson tunneling as a noise metering detector. After extensive testing and optimization, we have achieved less than 8 μeV 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. |
| Databáze: | OpenAIRE |
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