442 citations · 937 across the 6 of their papers we have counts for
6 papers
Impurity Band Conduction in a High Temperature Ferromagnetic Semiconductor
K. S. Burch, D. B. Shrekenhamer, E. J. Singley +7
The band structure of a prototypical dilute ferromagnetic semiconductor, GaMnAs, is studied across the phase diagram via optical spectroscopy. We prove that the Fermi…
Ellipsometric study of the Electronic Structure of GaMnAs and LT-GaAs
K. S. Burch, J. Stephens, R. K. Kawakami +2
We have measured the optical constants of GaMnAs from 0.62 eV to 6 eV, using spectroscopic ellipsometry. The second derivatives of the dielectric function are examined through a cr…
Spatial Imaging of Magnetically Patterned Nuclear Spins in GaAs
J. Stephens, R. K. Kawakami, J. Berezovsky +4
We exploit ferromagnetic imprinting to create complex laterally defined regions of nuclear spin polarization in lithographically patterned MnAs/GaAs epilayers grown by molecular be…
Giant Planar Hall Effect in Epitaxial (Ga,Mn)As Devices
H. X. Tang, R. K. Kawakami, D. D. Awschalom +1
Large Hall resistance jumps are observed in microdevices patterned from epitaxial (Ga,Mn)As layers when subjected to a swept, in-plane magnetic field. This giant planar Hall effect…
Spontaneous Spin Coherence in n-GaAs Produced by Ferromagnetic Proximity Polarization
R. J. Epstein, I. Malajovich, R. K. Kawakami +5
We find that photoexcited electrons in an n-GaAs epilayer rapidly (< 50 ps) spin-polarize due to the proximity of an epitaxial ferromagnetic metal. Comparison between MnAs/GaAs and…
Spin-polarized Zener tunneling in (Ga,Mn)As
E. Johnston-Halperin, D. Lofgreen, R. K. Kawakami +4
We investigate spin-polarized inter-band tunneling through measurement of (Ga,Mn)As based Zener tunnel diode. By placing the diode under reverse bias, electron spin polarization is…