Related Experiment Video
Updated: Jan 28, 2026

Scanning-probe Single-electron Capacitance Spectroscopy
Published on: July 30, 2013
Electron dynamics in In x Ga1-x As shells around GaAs nanowires probed by terahertz spectroscopy
Ivan Fotev1, Leila Balaghi, Johannes Schmidt
1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, D-01328 Dresden, Germany. Technische Universität Dresden, D-01062 Dresden, Germany.
Abstract:
We present the electrical properties of GaAs/In x Ga1-x As core/shell nanowires (NWs) measured by ultrafast optical pump-terahertz probe spectroscopy. This contactless technique was used to measure the photoconductivity of NWs with shell compositions of x = 0.20, 0.30 and 0.44. The results were fitted with the model of localized surface plasmon in a cylinder in order to obtain electron mobilities, concentrations and lifetimes in the In x Ga1-x As NW shells. The estimated lifetimes are about 80-100 ps and the electron mobility reaches 3700 cm2 V-1 s-1 at room temperature. This makes GaAs/InGaAs NWs good candidates for the realization of high-electron-mobility transistors, which can also be monolithically integrated in Si-CMOS circuits.
Related Concept Videos
UV–Vis Spectroscopy: Molecular Electronic Transitions
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals
Electron Affinity
Electron Carriers
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
Electron Configuration of Multielectron Atoms
Electron Behavior
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...

