全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

(英)嵌有两个量子点的三终端量子环中的横向自旋流

Keywords: 量子点环,量子点,自旋流,非平衡格林函数

Full-Text   Cite this paper   Add to My Lib

Abstract:

从理论上研究了一个上臂与下臂各嵌有一个量子点的三终端三臂量子环中的自旋极化的电子输运性质.考虑了两个量子点中的库仑互作用并假设在某一个环臂中存在Rashba自旋轨道耦合作用.利用非平衡态格林函数方法,发现不需要借助任何磁场与磁性物质Rashba自旋轨道耦合作用导致的量子干涉效应就可以从器件中驱动出一个自旋流.适当调节外加偏压、Rashba自旋轨道耦合作用强度以及量子点能级等系统参数时器件中甚至还可以产生完全自旋极化电流或纯自旋流.另外,还讨论了系统参数对自旋流大小、符号、自旋极化度以及峰值的影响.

References

[1]  9Nitta J, Akazaki T, Takayanagi H, et al. Gate control of spin-orbit Iiteraction in an inverted In0.53Ga0.47As/In0.52Al0.48As heterostructure[J]. Phys. Rev. Lett., 1997,78(7): 1335-8.
[2]  10Souma S, Nikolic B K. Modulating unpolarized current in quantum spintronics: Visi-bility of spin-interference effects in multichannel Aharonov-Casher mesoscopic rings[J].Phys. Rev. B, 2004, 70(19): 195346-56.
[3]  11Chen K W, Chang C R. Quantum interference and spin polarization on Rashba double quantum dots embedded in a ring[J]. Phys. Rev. B, 2008, 78(23): 235319-25.
[4]  12Chi F, Zheng J. Spin-polarized current and spin accumulation in a three-terminal two quantum dots ring[J]. Appl. Phys. Lett., 2008, 92(17): 062106-8.
[5]  13Sun Q F, Xie X C. Spontaneous spin-polarized current in a nonuniform Rashba interaction system[J]. Phys. Rev. B, 2005, 71(15): 155321-6.
[6]  14Sun Q F, Wang Jian, Guo Hong. Quantum transport theory for nanostructures with Rashba spin-orbital interaction[J]. Phys. Rev. B, 2005, 71(16): 165310-1.
[7]  15Jauho A P, Wingreen N S, Meir Y. Time-dependent transport in interacting and non-interacting resonant-tunneling systems[J]. Phys. Rev. B, 1994, 50(8): 5528-44.
[8]  16Matsuyama T, Kursten R, Merkt U. Rashba spin splitting in inversion layers on p-type bulk InAs[J]. Phys. Rev. B, 2000, 61(23): 15588-91.
[9]  1Hubner J, Ruhle W W, Klude M, et al. Direct observation of optically injected spin-polarized currents in semiconductors [J]. Phys. Rev. Lett., 2003, 90(21): 216601-4.
[10]  2Stevens M J, Smirl A L, Bhat R D R, et al. Quantum interference control of ballistic pure spin currents in semiconductors[J]. Phys. Rev. Lett., 2003, 90(13): 136603-6.
[11]  3Johnson M, Silsbee R H, Interfacial charge-spin coupling: Injection and detection of spin magnetization in metals[J]. Phys. Rev. Lett., 1985, 55(17): 1790-3.
[12]  4Fiederling R, Kein M, Reuscher G, et al. Injection and detection of a spin-polarized current in a light-emitting diode[J]. Nature, 1999, 402(7): 787-790.
[13]  5Wang B G, Wang J, Guo H. Quantum spin field effect transistor[J]. Phys. Rev. B, 2003,67(09): 092408-11.
[14]  6Li C, Yu Y, Wei Y, et al. Nonadiabatic quantum spin pump: Interplay between spatial interference and photon-assisted tunneling in two-dimensional Rashba systems[J]. Phys.Rev. B, 2007, 75(3): 035312-9.
[15]  7Busl M, Platero G. Spin-polarized currents in double and triple quantum dots driven by ac magnetic fields[J]. Phys. Rev. B, 2010, 82(20): 205304-10.
[16]  8Datta S, Das B. Electronic analog of the electro-optic modulator[J]. Appl. Phys. Lett.,1990, 56(7): 665-7.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133