Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 84: Heterostructures and Interfaces
HL 84.7: Vortrag
Freitag, 24. März 2017, 11:30–11:45, POT 151
Magnetic quantum ratchet effect in CdTe and Cd(Mn)Te quantum wells with dual grating top gate structure — •Philipp Faltermeier1, Jan Unverzagt1, Stefan Hubmann1, Alexander Pfaller1, Zbigniew Adamus2, Grzegorz Karczewski2, Thomasz Wojtowicz2, Vasily. V. Bel’kov3, Leonid Golub3, Eougenious Ivchenko3, Grigory Budkin3, Vyacheslav Popov4, Denis V. Fateev4, Dieter Weiss1, and Sergey D. Ganichev1 — 1University of Regensburg, Regensburg, Germany — 2Institute of Physics, Polish Academy of Sciences, Warsaw, Poland — 3Ioffe Institute, St. Petersburg, Russia — 4Institute of Radio Engineering and Electronics (Saratov Branch), Saratov, Russia
We report on the observation of terahertz radiation induced magnetic-ratchet effects in CdTe and (Cd,Mn)Te quantum well structures superimposed with lateral superlattice. The in-plane potential was tuned by applying gate voltages. Irradiating the QW at normal incidence while applying a magnetic field B along the growth direction we observed that the terahertz-induced ratchet current exhibits sign-alternating 1/B periodic oscillations. The magnitude of the oscillations was by orders of magnitude larger than the ratchet photoresponse at zero magnetic field. The oscillation period corresponds to that of the Shubnikov-de-Haas effect. Our results reveal the existence of magnetic ratchet effects characterized by magnetic quantum photocurrent oscillations caused by Landau quantization and giant Zeeman effects in diluted magnetic heterostructures.