Effect of Γ–X Band Crossover on Resonant Tunneling Properties in GaAs/Ga0.7Al0.3As with Dresselhaus Spin-Orbit Interaction

IF 2.4 4区物理与天体物理 Q4 PHYSICS, CONDENSED MATTER

Physics of the Solid State Pub Date : 2026-02-16 DOI:10.1134/S1063783425600463

A. Meharajbegum, V. J. Priyadharshini, D. Gopinath, S. Rafi Ahamed, L. Bruno Chandrasekar, P. Shunmuga Sundaram, Sonaimuthu Mohandoss, M. Karunakaran, D. Shanmugapriya, J. Thirumalai

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Abstract

Our theoretical study focused on the spin-dependent electron transport characteristics in GaAs/Ga_0.7Al_0.3As resonant tunnel barriers. This system exhibits spin-splitting, which is a consequence of the Dresselhaus spin-orbit interaction. Calculation of the transmission coefficient and spin-polarization efficiency relies on the matrix method. The pressure influences the barrier transparency and degree of polarization. The maximum of 72% spin-polarization is achieved in this work at critical pressure. The role of the Γ–X band crossover is accounted for in this theory. The spin-polarization increases without the Γ–X band crossover and the same decreases with the Γ–X band crossover. At the critical pressure, the degree of spin polarization is high. Analysis of the electron dwell time reveals that spin-down electrons spend more time in the system than spin-up electrons. We also found that the dwell time reaches its maximum when the heterostructure is subjected to the critical pressure.

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Γ-X带交叉对Dresselhaus自旋轨道相互作用下GaAs/Ga0.7Al0.3As共振隧穿特性的影响

我们的理论研究重点是GaAs/Ga0.7Al0.3As共振隧道势垒中自旋相关的电子输运特性。该系统表现出自旋分裂，这是Dresselhaus自旋轨道相互作用的结果。透射系数和自旋极化效率的计算依赖于矩阵法。压力影响势垒的透明度和极化程度。在临界压力下，最大自旋极化率达到72%。该理论考虑了Γ-X波段交叉的作用。不进行Γ-X波段交叉时，自旋极化增大，进行Γ-X波段交叉时，自旋极化减小。在临界压力下，自旋极化程度较高。对电子停留时间的分析表明，自旋向下的电子比自旋向上的电子在系统中停留的时间更长。我们还发现，当异质结构受到临界压力时，停留时间达到最大值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physics of the Solid State 物理-物理：凝聚态物理

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

2-4 weeks

期刊介绍： Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.