Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 5: Spintronics: mainly interfaces and heterostructures

HL 5.7: Talk

Monday, March 11, 2013, 11:00–11:15, H16

Spin injection into semiconductor 2D systems — •Martin Oltscher, Mariusz Ciorga, Josef Loher, Dieter Schuh, Dominique Bougeard, and Dieter Weiss — Institute for Experimental and Applied Physics, University of Regensburg, Regensburg, Germany

Electrical generation and control of electron spins in semiconductor material is the central theme in semiconductor spintronics and of a big importance for device prospects. In particular spin injection into two-dimensional (2D) electron systems would allow for many new functionalities in future devices, with a Datta-Das Spin Field Effect Transistor [1] being a primary example. Building on successful realization of spin injection into bulk GaAs employing the diluted magnetic semiconductor (Ga,Mn)As as a ferromagnetic material [2] we extended our work into heterostructures containing 2D electron gases. We investigate two types of systems: an electron gas confined in an inverted AlGaAs/GaAs heterojunction and an InGaAs quantum well structure. We observe clear nonlocal spin-valve signals in both systems, however the origin of the high signal amplitude and its strong bias dependence for the high mobility AlGaAs/GaAs structure is still an open issue.

[1] S. Datta and B. Das, Appl. Phys. Lett. 56, 665 (1990)

[2] M . Ciorga et al., Phys. Rev. B 79, 165321 (2009)