Effect of conduction band nonprabolicity on the Rashba spin splitting of AlGaN/GaN QWs |
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Affiliation: | College of Electrical and Information engineering, Xuchang University, Xuchang 461000, China;GISC, Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain;AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059 Kraków, Poland;Institute of Applied Physics and Computational Mathematics, P. O. Box 8009(28), Beijing 100088, China;Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovakia;Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, Guangdong, China;College of Physical Science and Technology, Sichuan University, Chengdu 610064, China |
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Abstract: | By using the perturbation expansion method and self-consistent iterative method, we evaluate the effect of the conduction band nonprabolicity on the wave vector (kt) dependent Rashba coefficient (α) and nonlinear Rashba spin splitting (ΔE) in the Al0.5Ga0.5N/GaN quantum well (QW). The effective mass (energy) under the first order approximation mt1 (Ek1) is in proximity to the iterative result mtp (Ekp) and mt1>mtp, Ek1<Ekp, showing the higher order contributions to mt (Ek) are small. The sign of the nonparabolic correction to Ek is just opposite to that of the correction to mt. The increase of α and ΔE due to the conduction band nonparabolicity reaches about 3% at kt=1 nm−1. Around the left heterointerface, the probability density is high and Ek0>Ekp>Ek1, so α0<αp<α1, ΔE0<ΔEp<ΔE1. With increasing kt, α decreases, and ΔE increases slowly. For small kt, α0 (ΔE0), α1 (ΔE1) and αp (ΔEp) are nearly the same. While for large kt, the difference between α0 and α1 (αp) increases rapidly, but the difference between ΔE0 and ΔE1 (ΔEp) increases slowly. |
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Keywords: | Spin-orbit coupling Rashba spin splitting Conduction band nonprabolicity 2DEG Iterative method |
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