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HL: Fachverband Halbleiterphysik

HL 70: Spin phenomena in semiconductors

HL 70.1: Vortrag

Donnerstag, 19. März 2020, 15:00–15:15, POT 251

Spin noise spectroscopy for nuclear relaxation dynamics in InGaAs epilayer — •Clara Rittmann, Aleksandr Kamenskii, Alex Greilich, and Manfred Bayer — Experimentelle Physik II, Technische Universität Dortmund, 44221 Dortmund, Germany

We study the dynamic nuclear spin polarization in Indium Gallium Arsenide (InGaAs) epilayer under the circular excitation using a spin noise spectroscopy. The sample consists of a 10µm thick epitaxial layer of n-doped InGaAs with 3% of Indium, grown on a GaAs substrate. First, we characterize the unperturbed spin dynamics of resident electrons using the spin noise technique. It allows us to determine the spin relaxation time and the g-factor of the electron system. Further, we discover that an additional off-resonant circular excitation has a strong effect on the Larmor precession of the electron spins, without affecting the spin noise amplitude. This is related to the dynamic nuclear polarization by the optically oriented spins, which in their turn are affected by the induced Overhauser field, produced by the nuclear system. Finally, we study the common time evolution of the electron-nuclear system detecting the spin noise of the residual electrons.