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Spin-Orbit Coupling and Zero-Field Electron Spin Splitting in AlGaN/AlN/GaN Heterostructures with a Polarization Induced Two-Dimensional Electron Gas

Published online by Cambridge University Press:  01 February 2011

Ç. Kurdak ,
N. Biyikli ,
H. Cheng ,
U. Ozgur ,
H. Morkoç  and
V. I. Litvinov
Ç. Kurdak
Affiliation:
kurdak@umich.edu, University of Michigan, Physics Department, Physics Department, Randall Laboratory, 450 Church Street, University of Michigan, Ann Arbor, MI, 48109, United States, (734) 647 4650
N. Biyikli
Affiliation:
nbiyikli@vcu.edu, Virginia Commonwealth University, Department of Electrical Engineering, Richmond, VA, 23284, United States
H. Cheng
Affiliation:
hailingc@umich.edu, University of Michigan, Physics Department, Ann Arbor, MI, 48109, United States
U. Ozgur
Affiliation:
uozgur@vcu.edu, Virginia Commonwealth University, Department of Electrical Engineering, Richmond, VA, 23284, United States
H. Morkoç
Affiliation:
hmorkoc@vcu.edu, Virginia Commonwealth University, Department of Electrical Engineering, Richmond, VA, 23284, United States
V. I. Litvinov
Affiliation:
vlitvinov@earthlink.net, WaveBand/Sierra Nevada Corporation, 15245 Alton Parkway, Suite 100, Irvine, CA, 92618, United States
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Abstract

We studied spin-orbit coupling in wurtzite AlxGa1−xN/AlN/GaN heterostructures with different Al concentrations using weak antilocalization measurements at 1.6 K. Using the persistent photoconductivity effect we change the carrier density in controllable manner. We find that the electron spin splitting energies does not scale linearly with the Fermi wavevector at high carrier densities. From this deviation, for the first time, we are able to extract the cubic spin-orbit parameter for this material system.

Keywords

electrical propertiesIII-Vspintronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 955: Symposium I – Advances in III-V Nitride Semiconductor Materials and Devices , 2006 , 0955-I01-02
Copyright
Copyright © Materials Research Society 2007

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References

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