Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 42: Optical Properties of Quantum dots: Theory and Simulation

HL 42.3: Vortrag

Donnerstag, 28. Februar 2008, 10:00–10:15, EW 201

Theoretical investigation of optical properties of semiconductor nanostructures — •Gudny Gudmundsdottir and Frank Grosse — Institut für Physik der Humboldt Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany

Near band edge optical properties of compound semiconductors are determined by excitons. The two particle problem is numerically challenging in semiconductor nanostructures due to their inhomogeneous nature. The one-particle potentials for electron and hole contain the spatially varying band edge potentials given by the local chemical composition and are additionally modified by intrinsic static strain fields and acoustic phonons through deformation potential coupling.

We present calculations of optical properties by solving the time dependent Schrödinger equation for the full three dimensional exciton problem (6 coordinates) in embedded semiconductor quantum dots varying in shape and composition including disorder (alloys). The parallel implementation (MPI) of the computer code allows to treat these complex nanostructures efficiently. Input strain fields are generated from molecular dynamics simulations enabling us to study the influence of phonon wave packets on the optical response of quantum dots.