| Zugriffsnummer | 21276 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Shift currents from symmetry reduction and Coulomb effects in (110)-orientated GaAs/Al0.3Ga0.7As quantum wells |
| Autor(in); Institution |
Bieler, Mark; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig
Pierz, Klaus; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig
Siegner, Uwe; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig
Dawson, Philip; University of Manchester, School of Physics and Astronomy, Manchester, UK
|
| Quelle/Jahr | Physical Review B: 76 (2007), 161304-1 - 161304-4 |
| ISSN | 1098-0121 |
| DOI | |
| Verlag | Ridge, NY: APS |
| Klassifikationscode | PACS: 73.21.Fg ; PACS: 72.40.+w ; PACS: 78.67.-n ; PACS: 73.61.Ey |
| Zusammenfassung | We report on the observation of an additional shift current tensor element by interband excitation of undoped (110)-oriented GaAs/Al0.3Ga0.7As quantum wells with a 150 fs laser pulse. The additional tensor element results from the symmetry reduction of the quantum well structure and shows a strong enhancement and a phase shift at the light-hole exciton transition revealing that shift currents are a sensitive probe of Coulomb effects in semiconductors. Moreover, we show that the overall shift current does not directly follow the envelope of the optical excitation pulse but contains a noninstantaneous contribution. |
