Spin-dependent transport properties in strained silicene superlattice

Document Type : Full length research Paper

Author

Department of Physics, Faculty of Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

Abstract

Based on the transfer-matrix method, we theoretically investigate the spin-dependent transport properties in silicene superlattice, with extrinsic Rashba spin–orbit interaction (RSOI), in the presence of strain. Due to the RSOI coupling, spin-inversion can be achieved. The spin resolved conductance and spin- inversion effect can be efficiently tuned by RSOI and strain strength. In addition, for particular values of RSOI strength, electrons with perfect spin-inversion transmit through the silicene superlattice. It is found that the spin conductance can be efficiently controlled by the number of barriers. As the number of barriers increases, spin conductivities decrease. The results indicate that for the armchair direction strain, unlike the zigzag direction the spin polarization can be observed and it increases with increasing the RSOI strength. The magnitude and sign of spin polarization can be manipulated by strain strength. The spin polarization in silicene superlattice for any number of barriers reaches a maximum value at 2% strain.

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References

 
[1] P. Vogt, P. De. Padova, C. Quaresima, J. Avila, E. Frantzeskakis, M.C. Asensio, A. Resta, B. Ealet, G. Le. Lay,Silicene: Compelling Experimental Evidence for Graphenelike Two-Dimensional Silicon, Physical Review Letters 108 (2012) 155501. https://doi.org/10.1103/PhysRevLett.108.155501
[2] C.L. Kane, E.J. Mele, Quantum Spin Hall Effect in Graphene, Physical Review Letters 95 (2005) 226801.
https://doi.org/10.1103/PhysRevLett.95.226801
[3] Y. Yao, F. Ye, X.L. Qi, S.C. Zhang, Z. Fang, Spin-orbit gap of graphene: First principles calculations, Physical Review B 75 (2007) 041401.
https://doi.org/10.1103/PhysRevB.75.041401
[4] H. Min, J.E. Hill, N.A. Sinitsyn, B.R. Sahu, L. Kleinman, A.H. MacDonal, Intrinsic and Rashba spin-orbit interactions in graphene sheets, Physical Review B 74 (2006) 165310. https://doi.org/10.1103/PhysRevB.74.165310
[5] M. Zare, F. Parhizgar, R. Asgari, Topological phase and edge states dependence of the RKKY interaction in zigzag silicene nanoribbon, Physical Review B 94 (2016) 045443.
https://doi.org/10.1103/PhysRevB.94.045443
[6] C.-C. Liu, W. Feng, Y.G. Yao, Low-energy effective Hamiltonian involving spin-orbit coupling in silicene and two-dimensional germanium and tin, Physical Review B 84 (2011) 195430.
https://doi.org/10.1103/PhysRevB.84.195430
[7] T. Yokoyama, Controllable valley and spin transport in ferromagnetic silicene junctions, Physical Review B 87 (2013) 241409(R). https://doi.org/10.1103/PhysRevB.87.241409
[8] M. Ezawa, Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene, Physical Review Letters 109 (2012) 055502.
https://doi.org/10.1103/PhysRevLett.109.055502
 [9] H. Zhao, Strain and chirality effects on the mechanical and electronic properties of silicene and silicane under uniaxial tension, Physical Letters A 376 (2012) 3546.
https://doi.org/10.1016/j.physleta.2012.10.024
[10] T. Botari, E. Perim, P.A.S. Autreto, A.C.T. van Duin, R. Paupitz, D.S. Galvao, Mechanical properties and fracture dynamics of silicene membranes, Physical Chemistry Chemical Physics 16 (2014) 19417.
https://doi.org/10.1039/C4CP02902J
[11] R. Tsu, L. Esaki, Tunneling in a finite superlattice, Applied Physics Letters 22 (1973) 562.
https://doi.org/10.1063/1.1654509
[12] F. Khoeini, Z. Jafarkhani, M. Khalkhali, Spin transport in a superlattice silicene nanoribbon, Journal of Research on Many-body Systems 7 (2017) 89.
https://doi.org/10.22055/jrmbs.2017.17965.1197
 
[13] W. Li, W.-T. Lu, Y.-F. Li, H.-H. Han, Defect enhanced spin and valley polarizations in silicene superlattices, Physica E 88 (2017) 284.
https://doi.org/10.1016/j.physe.2017.01.016
[14] F. Sattari, Extrinsic Rashba spin-orbit interaction effect on shot noise properties in silicene superlattice, Superlattices Microst. 119 (2018) 218. 
https://doi.org/10.1016/j.spmi.2018.05.001
 
[15] A. Esmailpour, M. Abdolmaleki, M. Saadat, Dc conductance of ordered and disordered silicene superlattices, Physica E 77 (2016) 144.
https://doi.org/10.1016/j.physe.2015.11.006
[16] N. Missault, P. Vasilopoulos, V. Vargiamidis, F.M. Peeters, B. Van Duppen, Spin- and valley-dependent transport through arrays of ferromagnetic silicene junctions, Physical Review B 92 (2015) 195423.
https://doi.org/10.1103/PhysRevB.92.195423
[17] Q. Zhang, K.S. Chan, J. Li, Electrically controllable sudden reversals in spin and valley polarization in silicene, Scientific Reports 6 (2016)33701.
https://doi.org/10.1038/srep33701
[18] M. Farokhnezhad, M. Esmaeilzadeh, and Kh. Shakouri, Strain-modulated anisotropy of quantum transport properties in single-layer silicene: Spin and valley filtering, Physical Review B 96 (2017) 205416.
https://doi.org/10.1103/PhysRevB.96.205416
[19] X.Q. Den, R.Q. Sheng, Spin transport investigation of two type silicene nanoribbons heterostructure, Physical Letters A 383 (2019) 47.
https://doi.org/10.1016/j.physleta.2018.09.003
[20] Y.-L. Sun, X.-B. Wang, E.-J. Ye, Spin-polarized transport induced by photoirradiation in zigzag silicene nanosystem, Physical Letters A 383 (2019) 63.
https://doi.org/10.1016/j.physleta.2018.09.042
[21] L. Ming, H. Hongpei, Z.-B. Feng, Z. Zhengyin, Conductance of armchair silicene nanoribbon junctions, Physica E 111 (2019) 172.
https://doi.org/10.1016/j.physe.2019.03.020
[22] V.M. Pereira, A.H. Castro Neto, N. M.R. Peres, Tight-binding approach to uniaxial strain in graphene, Physical Review B 80 (2009) 045401.
https://doi.org/10.1103/PhysRevB.80.045401
[23] P. Xu, Z. Yu, C. Yang, P. Lu, Y. Liu, H. Ye, T. Gao, Comparative study on the nonlinear properties of bilayer graphene and silicene under tension, Superlattices Microst. 75 (2014) 647.
https://doi.org/10.1016/j.spmi.2014.08.022
[24] R. Qin, W. Zhu, Y. Zhang, X. Deng, Uniaxial strain-induced mechanical and electronic property modulation of silicene, Nanoscale Research Letters 9 (2014) 521.
https://doi.org/10.1186/1556-276X-9-521
 
[25] M. Ezawa, Spin-valley optical selection rule and strong circular dichroism in silicene, Physical Review B 86 (2012) 161407(R).
https://doi.org/10.1103/PhysRevB.86.161407
[26] A. Mazloom, F. Parhizgar, S.H. Abedinpour, R. Asgari, Relaxation times and charge conductivity of silicene, Physical Review B 94 (2016) 035153.
https://doi.org/10.1103/PhysRevB.94.035153
[27] M. Büttiker, Four-Terminal Phase-Coherent Conductance, Physical Review Letters 57 (1986) 1761.
https://doi.org/10.1103/PhysRevLett.57.1761
[28] A.T. Ngo, J.M. Villas-Boas, S.E. Ulloa, Spin polarization control via magnetic barriers and spin-orbit effects, Physical Review B 78 (2008) 245310.
https://doi.org/10.1103/PhysRevB.78.245310
Journal of Research on Many-body Systems
Volume 9, Issue 4 - Serial Number 23
February 2020
Pages 57-67

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History

  • Receive Date: 14 May 2018
  • Revise Date: 20 October 2019
  • Accept Date: 31 December 2019

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