A dual tip STM for superconducting phase-difference detection
ORAL
Abstract
We have built a dual tipped Pan-style STM, with each tip capable of independently scanning a sample. We have tested it at room temperature on graphite samples, and calibrated both scanners using atomic steps seen on graphite. We intend to use the STM at ultra-low (mK) temperatures to measure the spatial variation of the gauge-invariant phase difference in superconducting samples at the atomic scale. The two tips will function as the junctions of an asymmetric SQUID, with one tip acting as a reference while the other scans the sample. We will reduce fluctuations in the Josephson phase of the scanning tip by adding capacitance across the junctions and minimizing the geometric inductance.
*Work supported in part by NSF grant DMR06050763.
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Authors
Anita Roychowdhury
Laboratory for Physical Sciences and Physics Dept., University of Maryland, College Park
Laboratory for Physical Sciences, Physics Dept., University of Maryland, College Park
M.A. Gubrud
Laboratory for Physical Sciences and Physics Dept., University of Maryland, College Park
Dan Sullivan
Laboratory for Physical Sciences and Physics Dept., University of Maryland, College Park
Michael Dreyer
Laboratory for Physical Sciences and Physics Dept., University of Maryland, College Park
Laboratory for Physical Sciences, Physics Dept., University of Maryland, College Park
Laboratory for Physical Sciences, University of Maryland, College Park
University of Maryland
J.R. Anderson
University of Maryland, JQI
Physics Department, University of Maryland, College Park
Christopher Lobb
University of Maryland, JQI
Physics Department, University of Maryland, College Park
CNAM, University of Maryland
Physics department, University of Maryland
F.C. Wellstood
University of Maryland, JQI
University of Maryland
Physics Department, University of Maryland, College Park
