Transmission time and spin polarization for electron in magnetically confined semiconducotr nanostructure modulated by spin-orbit coupling

Wen Li; Lu Mao-Wang; Chen Jia-Li; Chen Sai-Yan; Cao Xue-Li; Zhang An-Qi

doi:10.7498/aps.73.20240285

Abstract

Because digital information in semiconductor spintronics is encoded, stored, processed, and transferred by electron spins instead of its charge, the operation of a spintronic device requires that electrons in semiconductors be spin polarized. But spin states of electrons in traditional semiconductor materials are usually degenerate, therefore, conventional semiconductors cannot be directly used to design spintronic devices. Thus, how to spin polarized electrons in ordinary semiconductors (also called spin injection) including its effective manipulation, has become an important direction of research. In physics, either Zeeman effect between electron spins and external magnetic fields or spin-orbit coupling of electron spins and its spatial momentums can be employed to achieve electron-spin polarization. According to these physical mechanisms, some effective schemes have been developed successfully, such as spin filtering, temporally separating electron-spins, and spatial separations of electron spins. Utilizing the combination of theoretical analysis and numerical calculation, transmission time is investigated by considering both Zeeman effect as well as Rashba and Dresselhaus spin-orbit couplings for electron in magnetically confined semiconductor nanostructure, which is constructed on the GaAs/Al_xGa_1–xAs heterostructure. Schrödinger equation of an electron is numerically solved by matrix diagonalization and improved transfer-matrix method. Adopting H.G. Winful’s theory, dwell time of electron is calculated and spin polarization ratio is given. Due to Zeeman effect and spin-orbit coupling, dwell time of electron is obviously associated with the spins, which is used to separate electron-spins in time dimension and to realize spin polarization of electrons in semiconductors. Because the semiconductor GaAs has a small effective g-factor, which is about 4 times larger than that induced by Zeeman effect, electron-spin polarization originates mainly from spin-orbit coupling including Rashba and Dresselhaus types. Dwell time of electron and its spin polarization can be efficaciously modified by interfacial confining electric-field or strain engineering, because the effective potential of electron is related to spin-orbit coupling’s strength. These interesting findings not only have some references for spin injection into semiconductors, but also provide a controllable temporal electron-spin splitter for semiconductor spintronics device applications.

Keywords:

semiconductor spintronics /
magnetically confined semiconductor nanostructure /
spin-orbit coupling /
dwell time

Authors and contacts

College of Physics and Electronic Information Engineering, Guilin University of Technology, Guilin 541004, China

Corresponding author: Lu Mao-Wang, maowanglu@glut.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11864009, 62164005) and the Guangxi Natural Science Foundation of China (Grant No. 2021JJB110053).

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References

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Cited By

图 1 真实MCSN结构(a)及其模型(b), 图中垂直磁化的铁磁(FM)条带沉积在GaAs/Al_xGa_1–xAs异质结的表面, d、h和$ {M_0} $分别是FM条带的宽度、厚度和磁化强度, z₀表示FM条带与2DEG之间的距离, 结构的两端分别位于x_–和x₊处, B_z(x)是FM条带在2DEG平面内产生的磁场

Figure 1. The MCSN device(a)and its model(b), where a vertically magnetized ferromagnetic (FM) stripe is patterned in the surface of GaAs/Al_xGa_1–xAs heterostructure, d, h, $ {\vec M_0} $, x_- and x₊ are width, thickness, magnetization, left position and right end, respectively, z₀ represents the distance between FM stripe and 2DEG, and B_z(x) is magnetic field induced by FM stripe within 2DEG.

DownLoad: Full-Size Img PowerPoint

图 2 仅考虑塞曼效应时, 自旋向上电子和自旋向下电子在真实MCSN结构中的居留时间及其自旋极化(在插图中)随着入射能的变化, 图中电子的横向波矢取为k_y = 0(垂直入射)

Figure 2. When only Zeeman effect is involved, dwell time changes with incident energy for spin-up (up-triangle curve) and spin-down (down-triangle curve) electrons in the MCSN, respectively, where spin polarization ratio defined by dwell time is presented in the inset and transverse wave vector of electron is chosen as k_y = 0 (i.e., the normal incidence).

DownLoad: Full-Size Img PowerPoint

图 3 只考虑Rashba型SOC耦合　(a) 自旋向上和自旋向下电子在真实MCSN结构中的居留时间及其自旋极化(在插图中)随着入射能量的变化, 其中Rashba-SOC耦合的强度为$\eta_{\mathrm{R}} $ = 0.2; (b)当入射能量分别为E = 3.0, 5.0, 7.0时, 自旋极化随着Rashba-SOC耦合强度的变化; 图中电子的横向波矢取为k_y = 0

Figure 3. Only Rashba-SOC effect is considered: (a) Dwell time and spin polarization ratio (in the inset) vary with incident energy for spin-up and spin-down electrons in the MCSN, where Rashba-SOC strength is chosen as $\eta_{\mathrm{R}} $ = 0.2; (b) spin polarization ratio changes with Rashba-SOC strength for incident energy E = 3.0, 5.0, 7.0; and transverse wave vector is set to be k_y = 0.

DownLoad: Full-Size Img PowerPoint

图 4 仅计及Dresselhaus型SOC效应　(a) 自旋向上和自旋向下电子在真实MCSN结构的居留时间及其自旋极化(在插图中)随着入射能量的变化, 其中Dresselhaus-SOC耦合的强度为$\eta_{\mathrm{D}} $ = 0.2; (b)当入射能量分别为E = 3.0, 5.0, 7.0时, 自旋极化随着Dresselhaus-SOC强度的变化; 图中电子的横向波矢取为k_y = 0

Figure 4. Only Dresselhaus-SOC effect is considered: (a) Dwell time and spin polarization ratio (in the inset) vary with incident energy for spin-up and spin-down electrons in the MCSN, where Dresselhaus-SOC strength is chosen as $\eta_{\mathrm{D}} $ = 0.2; (b) spin polarization ratio changes with Dresselhaus-SOC strength for incident energy E = 3.0, 5.0, 7.0; and transverse wave vector is set to be k_y = 0.

DownLoad: Full-Size Img PowerPoint

[1]	Wolf S A, Awschalom D D, Buhrman R A, Daughton J M, von Molnár S, Roukes M L, Chtchelkanova A Y, Treger D M 2001 Science 294 1488 Google Scholar
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[4]	Soumyanrayanan A, Reyren N, Fert A, Panagopoulos C 2016 Nature 539 509 Google Scholar
[5]	蒋龙兴, 李庆超, 张旭, 李京峰, 张静, 陈祖信, 曾敏, 吴昊 2024 物理学报 73 017505 Google Scholar Jiang L X, Li Q C, Zhang X, Li J F, Zhang J, Chen Z X, Zeng M, Wu H 2024 Acta Phys. Sin. 73 017505 Google Scholar
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[10]	Kitchen D, Richardella A, Tang J M, Flatté M E, Yazdani A 2006 Nature 442 436 Google Scholar
[11]	贺亚萍, 陈明霞, 潘杰锋, 李冬, 林港钧, 黄新红 2023 物理学报 72 028503 Google Scholar He Y P, Chen M X, Pan J F, Li D, Lin G J, Huang X H 2023 Acta Phys. Sin. 72 028503 Google Scholar
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[15]	Das S, Ghosh S, Kumar R, Bag A, Biswas D 2017 IEEE Trans. Electron Devices 64 4650 Google Scholar
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[22]	Xu H Z, Liu P J, Zhang Y F 2003 Phys. Status Solidi B 240 169 Google Scholar
[23]	Chen S Y, Zhang G L, Cao X L, Peng F F 2021 J. Comput. Electron. 20 785 Google Scholar
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[29]	Capasso F, Mohammed K, Cho A Y, Hull R, Hutchinson A L 1985 Appl. Phys. Lett. 47 420 Google Scholar
[30]	Lu M W, Chen S Y, Cao X L, Huang X H 2020 Results Phys. 19 103375 Google Scholar
[31]	Chen S Y, Cao X L, Huang X H, Lu M W 2023 Eur. Phys. J. Plus 138 111 Google Scholar
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[44]	You J Q, Zhang L D, Ghosh P K 1995 Phys. Rev. B 52 17243 Google Scholar
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