New mechanisms of optical harmonic generation in semiconductors [Elektronische Ressource] / presented by Benjamin Kaminski

Benjamin KaminskiNew Mechanisms ofOptical Harmonic Generationin SemiconductorsNew Mechanisms ofOptical Harmonic Generationin SemiconductorsDissertationpresented to the Institute of Physics of the Dortmund TechnicalUniversity, Germany, in partial ful lment of the requirements for thedegree of Doktor rer. nat.presented byBenjamin KaminskiDortmund, September 2009Accepted by the faculty of the Institute of Physics of the Dortmund TechnicalUniversity, Germany.Day of the oral exam: 2nd November 2009Examination board:Prof. Dr. Dmitri R. YakovlevProf. Dr. Metin TolanProf. Dr. Werner WeberDr. B arbel SiegmannContentsMotivation 11 Magnetism and Symmetry 61.1 Disordered magnetic systems . . . . . . . . . . . . . . . . . . . . . . . . 61.1.1 Diamagnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.1.2 Paramagnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.2 Ordered magnetic systems . . . . . . . . . . . . . . . . . . . . . . . . . 131.2.1 Exchange interactions and Heisenberg model . . . . . . . . . . . 131.2.2 Ferromagnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . 141.2.3 Antiferromagnetism . . . . . . . . . . . . . . . . . . . . . . . . . 151.2.4 Ferrimagnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . 171.2.5 Metamagnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . 171.2.6 Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181.3 Symmetry and group theory . . . . .