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HL: Fachverband Halbleiterphysik

HL 19: Spin-controlled Transport I

HL 19.6: Vortrag

Dienstag, 23. März 2010, 10:45–11:00, H14

DC measurements on InAs two-stage spin-filter cascades — •Jan Jacob, Hauke Lehmann, Marc-Antonio Bisotti, Toru Matsuyama, Guido Meier, and Ulrich Merkt — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg

For spintronics it is a prerequisite to create devices capable of generating and detecting spin-polarized currents. We present an all-semiconductor nanostructure based on an InAs heterostructure, which can be used to generate spin-polarized currents all-electrically utilizing the intrinsic spin Hall effect in a Y-shaped junction. By cascading two spin filters the first acts as a generator of spin-polarized currents while the second acts as an all-electrical detector [1]. Measurements applying an AC voltage to the two-stage spin-filter cascade have proven the feasibility of these devices as efficient generators and detectors for spin-polarized currents [2]. For the investigation of the influence of magnetic and electric fields in different directions it is essential to use DC voltages to direct the electron flow in constant direction instead of alternating directions in the AC case and thereby keeping the geometric relation between the current flow and the applied field constant. To enable lock-in technique we apply a DC voltage with AC modulation to the spin-filter cascade.

[1] A. Cummings, R. Akis, D. Ferry, J. Jacob, T. Matsuyama, U. Merkt, and G. Meier. J. Appl. Phys., 104, 066106 (2008).

[2] J. Jacob, G. Meier, S. Peters, T. Matsuyama, U. Merkt, A. Cummings, R. Akis, and D. Ferry. J. Appl. Phys., 105 093714 (2009).