Phys. Rev. Lett. 99, 127203 (2007) [4 pages]Exchange-Mediated Anisotropy of (Ga,Mn)As Valence-Band Probed by Resonant Tunneling SpectroscopyReceived 19 June 2007; published 17 September 2007 We report on experiments and theory of resonant tunneling anisotropic magnetoresistance (TAMR) in AlAs/GaAs/AlAs quantum wells (QW) contacted by a (Ga,Mn)As ferromagnetic electrode. Such resonance effects manifest themselves by bias-dependent oscillations of the TAMR signal correlated to the successive positions of heavy (HH) and light (LH) quantized hole energy levels in GaAs QW. We have modeled the experimental data by calculating the spin-dependent resonant tunneling transmission in the frame of the 6×6 valence-band k·p theory. The calculations emphasize the opposite contributions of the (Ga,Mn)As HH and LH subbands near the Γ point, unraveling the anatomy of the diluted magnetic semiconductor valence band. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.127203
DOI:
10.1103/PhysRevLett.99.127203
PACS:
85.75.Mm, 72.25.Dc, 75.47.−m, 75.50.Pp
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