Ultrafast piezospectroscopy of semiconductor micro- and nanostructures [Elektronische Ressource] / presented by Thorsten Berstermann

Thorsten BerstermannUltrafast Piezospectroscopy ofSemiconductor Micro- and NanostructuresUltrafast Piezospectroscopy ofSemiconductor Micro- and NanostructuresDissertationpresented to the Faculty of Physics of theTechnische Universit¨at Dortmund, Germany,in partial fulfillment of the requirementsfor the degree of Doktor rer. nat.presented byThorsten BerstermannDortmund, May 3, 2010Accepted by the Faculty of Physics of theTechnische Universit¨at Dortmund, Germany.Day of the oral exam: 8th April 2010Examination board:Prof. Dr. Manfred BayerProf. Dr. Metin TolanProf. Dr. G¨otz S. UhrigDr. B¨arbel SiegmannContentsI Introduction 11 Motivation and Outline 32 Picosecond Laser Acoustics 52.1 The Phonon Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.2 Coherent Phonons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.2.1 Excitation of Ultrashort Coherent Phonon Wavepackets . . . . . 72.3 Anharmonicity: Shockwaves and Acoustic Solitons . . . . . . . . . . . . 92.3.1 Concept of Strain Energy . . . . . . . . . . . . . . . . . . . . . 92.3.2 Nonlinear Elastic Expansion . . . . . . . . . . . . . . . . . . . . 102.3.3 Korteweg-de-Vries Equation . . . . . . . . . . . . . . . . . . . . 113 Semiconductor structures 153.1 Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153.1.1 Semiconductor Microcavities . . . . . . . . . . . . . . . . . . . . 163.1.2 Semiconductor Quantum Wells . . . . . . . . .