Low-Energy Electron Potentiometry: Contactless Imaging of Charge Transport on the Nanoscale.

ABSTRACT: Charge transport measurements form an essential tool in condensed matter physics. The usual approach is to contact a sample by two or four probes, measure the resistance and derive the resistivity, assuming homogeneity within the sample. A more thorough understanding, however, requires knowledge of local resistivity variations. Spatially resolved information is particularly important when studying novel materials like topological insulators, where the current is localized at the edges, or quasi-two-dimensional (2D) systems, where small-scale variations can determine global properties. Here, we demonstrate a new method to determine spatially-resolved voltage maps of current-carrying samples. This technique is based on low-energy electron microscopy (LEEM) and is therefore quick and non-inva

SUBMITTER: Kautz J 

PROVIDER: S-EPMC4559764 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature