Local transport measurements at mesoscopic length scales using scanning tunneling potentiometry
| Autor: | Michael Rozler, M. R. Beasley, Weigang Wang, Ko Munakata |
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| Rok vydání: | 2012 |
| Předmět: |
Mesoscopic physics
Materials science Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics General Physics and Astronomy FOS: Physical sciences Nanotechnology Focused ion beam Dipole Residual resistivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) High spatial resolution Spatial variability Thin film Quantum tunnelling |
| DOI: | 10.48550/arxiv.1211.6088 |
| Popis: | Under mesoscopic conditions, the transport potential on a thin film with current is theoretically expected to bear spatial variation due to quantum interference. Scanning tunneling potentiometry is the ideal tool to investigate such variation, by virtue of its high spatial resolution. We report in this {\it Letter} the first detailed measurement of transport potential under mesoscopic conditions. Epitaxial graphene at a temperature of 17K was chosen as the initial system for study because the characteristic transport length scales in this material are relatively large. Tip jumping artifacts are a major possible contribution to systematic errors; and we mitigate such problems by using custom-made slender and sharp tips manufactured by focussed ion beam. In our data, we observe residual resistivity dipoles associated with topoographical defects, and local peaks and dips in the potential that are not associated with topographical defects. |
| Databáze: | OpenAIRE |
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