Dresden 2006 – wissenschaftliches Programm

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PV: Plenarvorträge

PV III

PV III: Preisträgervortrag

Montag, 27. März 2006, 13:15–14:00, HSZ 01

Quantum Dots: Genesis, The Excitonic Zoo and its Applications — •Dieter Bimberg — Institute of Solid State Physics and Center of Nanophotonics, Technical University Berlin, Hardenbergst.36, Eugene P. Wigner Bld., 10623 Berlin — Träger des Max-Born-Preises

Zero-dimensional structures in semiconductors - quantum dots - resemble in some aspects, like their delta-function density of states, giant atoms in a dielectric cage. Much beyond that they are unique physical systems, since slightest variations of their geometrical properties, their size or shape, change dramatically their electronic and optical properties: The excitonic emission wavelengths are continuously tuneable across large ranges, binding energies of excitonic molecules may change their sign, the excitonic fine structure splitting can be huge, and may change its sign, …

Self organisation of molecules at surfaces or spinodal decomposition in three-dimensional multernary materials is presently utilized for the creation of QDs. High bit rate and secure quantum cryptographic systems might present some of the first fields of applications of QD-based devices.