Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 30: Quantum dots and wires: Transport properties II

HL 30.2: Vortrag

Mittwoch, 29. März 2006, 18:30–18:45, HSZ 01

Ballistic electron spectroscopy with a quantum dot — •Frank Hohls, M. Pepper, J. P. Griffith, G. Jones, and D. A. Ritchie — Cavendish Laboratory, University of Cambridge, UK

Non-equilibrium transport measurements can be used to characterise and analyze confined electron systems. However, if there is a strong interaction between electrons then the assumptions underlying these techniques should be modified. In order to investigate the energy spectrum with a method which measures the energies directly, we propose to use a quantum dot for the energy-selective detection of non-equilibrium ballistic electrons injected from a device under study into its drain lead. Here we study the feasibility of this ballistic electron spectroscopy. Our device consists of two quantum dots, one used to prepare ballistic electrons with a well defined excess energy and the other used to demonstrate their detection. We use magnetic field dependence to demonstrate the ballistic nature of the detector signal and show the energy selectivity for varying excess energy of the ballistic electron beam.