Hummel, A.B.A.B.HummelBlöser, C.C.BlöserBauer, T.T.BauerRoskos, H.G.H.G.RoskosKosevich, Y.Y.KosevichKöhler, KlausKlausKöhler2022-03-032022-03-032005https://publica.fraunhofer.de/handle/publica/20896710.1002/pssb.2004607032-s2.0-18744364433After the first observation of the Coherent Hall Effect in a GaAs/Al(0.3)Ga(0.7)As superlattice by means of THz-emission spectroscopy, the dynamics of impulsively excited electron wavepackets in crossed electric and magnetic fields has now been investigated in more detail by reflective electro-optic sampling (REOS). In agreement with the predictions of a semiclassical model, the experiments show the existence of two strictly separated regimes of charge-carrier motion depending on the ratio E/B of applied electric and magnetic field. Both, the magneto-Bloch regime for dominating electric field and the cyclotron-like regime of motion for dominating magnetic field, exhibit a characteristic frequency dependence of the wavepacket oscillations on the external fields. The REOS measurements supplement our results achieved by THz-emission spectroscopy by covering a much larger range of experimental parameters because REOS is not affected by absorption by the cryostat windows of our set-up as is the THz radiation at frequencies above 2 THz, and the detection of high oscillation frequencies is possible.enIII-V HalbleiterIII-V semiconductorsuperlatticeÜbergitteroptical spectroscopyoptische Spektroskopie621667530journal article