جریان و شات نویز اسپینی در ساختار چندلایه ای ZnSe/ZnMnSe

نویسندگان

1 دانشگاه آزاد اسلامی واحد ساری

2 گیلان- دانشگاه گیلان- رشت

چکیده
در این مقاله با استفاده از روش ماتریس انتقال و با در نظر گرفتن برهمکنش اسپین- مدار راشبا در ساختار ZnSe/ZnMnSe/ZnSe/ZnMnSe/ZnSe به بررسی اثر ضخامت لایه­ های ZnMnSe و ZnSe بر چگالی جریان و شات نویز اسپینی پرداختیم. نتایج نشان می­د­هند که ضخامت لایه ZnMnSe نقش مهمی در قطبیدگی اسپینی دارد به گونه­ای که جریان و شات نویز برای اسپین­های پایین بصورت نوسانی افزایش و برای اسپین­های بالا به آرامی کاهش می­یابد. همچنین اثر راشبا برای اسپین­های بالا و پایین به ترتیب باعث افزایش و کاهش ارتفاع سد پیش روی آنها می­شود و در نتیجه جریان و شات نویز برای اسپین بالا کاهش و برای اسپین پایین افزایش می­یابد.

کلیدواژه‌ها


عنوان مقاله English

Spin current density and Shot Noise inZnSe/ ZnMnSe heterostructure

نویسندگان English

Ahmad Ahmadi Fouladi 1
Sahar Ghasb Satoori 2
Javad Vahedi 1
1 2Department of Physics, Sari Branch, Islamic Azad University, Sari, Iran
2 1Department of Physics, University of Guilan, Rasht, Iran
چکیده English

In this work, using the transfer matrix method and considering the Rashba spin-orbit interaction in the ZnSe/ZnMnSe/ZnSe/ZnMnSe/ZnSe heterostructures, the thickness effects of ZnMnSe and ZnSe layers on spin current density and shot noise is investigated. Results show that ZnMnSe thickness has a crucial role in spin polarization, in which spin current and shot noise for a spin up shows increasing with oscillation behavior while for a spin down shows a monotonically decreasing trend. Moreover, the effect of Rashba on spin up and spin down is to increase and decrease the height potential, respectively, which consequently causes to decrease and increase of spin current and shot noise in spin up and down, respectively.

کلیدواژه‌ها English

Shot noise
Diluted Magnetic Semiconductors
Rashba spin-orbit interaction
[1] G. A.Prinz, "Magnetoelectronics"; Science, vol. 282, p.1660,1998. [DOI:10.1126/science.282.5394.1660] [PMID]
[2] J. Wang, H. B. Sun, D. Y. Xing, "Rashba spin precession in a magnetic field", Physical Review B, vol. 69, no. 85304, 2004. [DOI:10.1103/PhysRevB.69.085304]
[3] F. Ungar, P. I. Tamborenea, V. M. Axt, "Spin dynamics of hot excitons in diluted magnetic semiconductors with spin-orbit interaction", Physical Review B, vol. 100, no. 089901, 2019. [DOI:10.1103/PhysRevB.100.045306]
[4] M. Cygorek, P. I. Tamborenea, V. M. Axt, "Carrier-impurity spin transfer dynamics in paramagnetic II-VI diluted magnetic semiconductors in the presence of a wave-vector-dependent magnetic field", Physical Review B, vol. 93, no. 205201, 2016. [DOI:10.1103/PhysRevB.93.205201]
[5] D.H. Bui, Q.H. Ninh, H.N.Nguyen, V.N. Phan, "Ferromagnetic transition and spin fluctuations in diluted magnetic semiconductors", Physical Review B, vol. 99 , no. 045123, 2019. [DOI:10.1103/PhysRevB.99.045123]
[6] B. Gu, S. Maekawa, "Diluted magnetic semiconductors with narrow band gaps", Physical Revew B, vol. 94, no 155202, 2016. [DOI:10.1103/PhysRevB.94.155202]
[7] G. Liu, G. H. Zhou, "Conductance for a Quantum Wire with Weak Rashba Spin-Orbit Coupling", Chinese Physics Letter, vol. 22, no. 12 (3159), 2005. [DOI:10.1088/0256-307X/22/12/049]
[8] G. Schmidt, D. Ferrand, L. W. Molenkamp, A. T. Filip, B. J. VanWees, "Fundamental obstacle for electrical spin injection from a ferromagnetic metal into a diffusive semiconductor", Physical Reviw B, vol. 62, no. 4790, 2000. [DOI:10.1103/PhysRevB.62.R4790]
[9] D. A.Smith, "The zero-frequency susceptibility of spin glasses and mictomagnets", Journal of Physics F: Metal Physics.vol. 5 , no,. 2148, 1975. [DOI:10.1088/0305-4608/5/11/027]
[10] V. Sugakov, S. Yatskevich, "Role of neutral impurities in electron tunneling through a double heterojunction", Fiz. Tverd. Tela, vol. 33, no. 529, 1991.
[11] J.C. Egues, "Spin-Dependent Perpendicular Magnetotransport through a Tunable ZnSe/Zn1-xMnxSe Heterostructure: A Possible Spin Filter? ", Physical Review Letter, vol. 80, no. 4578, 1998. [DOI:10.1103/PhysRevLett.80.4578]
[12] N.N. Beletskii, G.P.Berman, S.A. Borysenko, "Controlling the spin polarization of the electron current in a semimagnetic resonant-tunneling diode", Physical Revew B, vol. 71. No. 125325, 2005. [DOI:10.1103/PhysRevB.71.125325]
[13] Y. Guo, L. Han, R. Zhu, W. Xu, "Spin-dependent shot noise in diluted-magnetic-semiconductor/semiconductor/heterostructures"; Eur. Phys. J. B, vol. 62, no. 45, 2008. [DOI:10.1140/epjb/e2008-00117-x]
[14] S.Wu, Y. Guo, "Spin-dependent shot noise in diluted magnetic semiconductor/semiconductor heterostructure with a nonmagnetic barrier", Physica E, vol. 59, no. 158, 2014. [DOI:10.1016/j.physe.2014.01.013]
[15] M.T. Pham, E. Amerling, , H.M. Luong, H. T. Pham, G. K. Larsen, L. Whittaker-Brooks,et al, "Origin of Rashba Spin-Orbit Coupling in 2D and 3D Lead Iodide Perovskites" , Sci Rep, vol. 10, no. 4964, 2020. [DOI:10.1038/s41598-020-61768-8] [PMID]
[16] Z.Y. Zhu, Y.C. Cheng, U. Schwingenschlogl, "Giant spin-orbit-induced spin splitting in two-dimensional transition-metal dichalcogenide semiconductors", Physical Review B, vol. 84(15), no. 153402, 2011. [DOI:10.1103/PhysRevB.84.153402]
[17] W. Ju, Y. Zhang, Z. Gao, Q. Zhou, D. Kang, T. Li, et al, "Rashba states situated inside the band gap of InTe/PtSe2 heterostructure", Results in Physics, vol. 28, no. 104673, 2021. [DOI:10.1016/j.rinp.2021.104673]
[18] B. Das, S. Datta, R. Reifenberger, "Zero-field spin splitting in two-dimensional electron gas", Physical Revew B, vol. 41, no. 8278, 1990. [DOI:10.1103/PhysRevB.41.8278] [PMID]
[19] Y.T. Zhang, Y. Guo, Y.C. Li., "Rashba spin-orbit effect on shot noise in ferromagnetic/semiconductor/ferromagnetic heterojunctions", phys. stat. sol. (b), vol. 242, no. 14, 2005. [DOI:10.1002/pssb.200541216]
[20] A. Saffarzadeh, M. Bahar, M. Banihasan, "Spin-dependent resonant tunneling in ZnSe/ZnMnSe heterostructures", Physica E, vol. 27, no. 462, 2005. [DOI:10.1016/j.physe.2005.01.015]