Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 64: Poster II

HL 64.49: Poster

Thursday, March 19, 2020, 10:00–13:00, P1A

Nuclear spin dynamics in n-GaAs — •Lida Abaspour, Pavel Sterin, Jan Gerrit Lonnemann, Eddy Rugeramigabo, Jens Hübner, and Michael Oestreich — Institute for Solid States Physics, Leibniz University of Hannover, Appelstraße 2, D-30167 Hannover

Interaction of electron and nuclear spins in semiconductors became more important over the last few years for applications in spin based quantum information [1, 2]. However, the knowledge to understand the exact spin dynamics of such a complex system is not complete.

In this work, we measure the nuclear spin relaxation rate in a set of n-GaAs samples in a magnetic field much larger than the local fields. In this way the dipolar and quadrupolar effects can be ignored. The interaction of the nuclei with localized impurities (insulating samples) is different from conduction band electrons (metallic samples). In order to unravel the complex processes involved in the spin dynamics of this system, we use the results from magnetotransport measurements of the same samples [3] which yield access to the fraction of the localized doping in each sample. This helps us to explain the behavior of the nuclear spin relaxation rate in dependence of doping. The temperature dependence in insulating sample gives us more information about the spin dynamics of the system in terms of phonon interaction.

[1] F. Berski et al.,Phys. Rev. Lett, 115, 176601 (2015).

[2] M. Vladimirova, et al. Phys. Rev. B, 95, 125312 (2017).

[3] J. G. Lonnemann, et al. Phys. Rev. B, 96, 045201 (2017).