Session N19: Semiconductor Spin Transport

8:00 AM–11:00 AM, Wednesday, March 15, 2006
Baltimore Convention Center Room: 316

Chair: Jim Chelikowsky, University of Texas

Abstract ID: BAPS.2006.MAR.N19.5

Abstract: N19.00005 : Magnetic Resonances in the circular polarization of light emitted by Fe/InAs QD spin LEDs

8:48 AM–9:00 AM

Preview Abstract MathJax On | Off   Abstract

Authors:

M. Yasar
S. Delikanli
R. Mallory
A. Petrou
(SUNY Buffalo)

G. Kioseoglou
A.T. Hanbicki
C.H. Li
B.T. Jonker
(Naval Research Laboratory)

The circular polarization $P_{circ}$ of the light emitted from InAs QD LEDs was studied as function of applied magnetic field $B$ in the 5-75 K temperature range. The quantum dots are incorporated at the center of a GaAs quantum well of width $L_{W}$ . At$T$ = 5 K we observed two distinct resonances in the $P_{circ}$ versus $B$ plot. For $L_{W}$ = 430 {\AA} the resonances occur at $B$ = 4.6 T (strong) and $B$ = 2.3 T (weak). The strength of the resonances depends critically on bias voltage $V$ (very pronounced at low $V$values ) The resonances become weaker with increasing temperature and disappear completely by $T$ = 60 K. No resonances were observed in LEDs in which the QDs were not incorporated in a quantum well. We propose a model that takes into account the confinement conduction subbands of the GaAs quantum well and the dependence of their energies on magnetic field. Acknowledgements: This work is supported by the DARPA SpinS Project, ONR, and NSF

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.N19.5