Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 30: Quantum dots and wires: Transport properties II
HL 30.1: Vortrag
Dienstag, 26. Februar 2008, 14:15–14:30, ER 164
Mesoscopic Optoelectronic Transport Across Lithographically Defined Quantum Wires — •K.-D. Hof1, S. Manus1, W. Wegscheider2, J. P. Kotthaus1, and A. W. Holleitner3 — 1Fakultat fur Physik and Center for NanoScience, LMU Munich. — 2Institut fur Angewandte Physik, University Regensburg. — 3TU Munich, Walter Schottky Institut, Am Coulombwall 3, 85748 Munich.
We report on optoelectronic transport phenomena in quasi one-dimensional wires which are lithographically defined in a quantum-well semiconductor heterostructure. The main focus of our experiments is to study mesoscopic transport phenomena of an optically induced, non-equilibrium charge population in the diffusive and the ballistic regime at the transition from a two-dimensional to a one-dimensional electron system [1,2]. We optically excite charge carriers in the quantum well at a specific distance to a quantum wire and measure the photo-induced conductance across the quantum wire. The electron dynamics are studied as a function of the excitation distance, photon wavelength, source-drain voltage, an external magnetic field, and a gate voltage applied to an electrode close to the quantum wire. We discuss effects of heat dissipation, excess charge tunneling, exciton recombination and non-equilibrium transport dynamics.
We gratefully acknowledge financial support from BMBF (nanoquit), DFG (Ho 3324/4), the Center of NanoScience (CeNS) in Munich, and the Nanosystem Initiative Munich (NIM).
[1] A. W. Holleitner et al., Phys. Rev. Lett. 97, 036805 (2006).
[2] K.-D. Hof et al., Physica E, in press.