中国物理B ›› 1999, Vol. 8 ›› Issue (3): 185-192.doi: 10.1088/1004-423X/8/3/005

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SPIN POLARIZATION IN A MODEL QUANTUM WIRE WITH A CROSS-SECTION

张庆刚1, 王传奎2, 王洪松3   

  1. (1)Department of Physics, Shandong Teachers University, Jinan 250014, China; (2)Department of Physics, Shandong Teachers University, Jinan 250014, China; Department of Physics and Measurement Technology, Link?ping University, S-58183, Link?ping, Sweden; (3)Division of Postgraduate, Shandong Teachers University, Jinan 250014, China
  • 收稿日期:1998-08-04 修回日期:1998-10-26 出版日期:1999-03-15 发布日期:1999-03-20
  • 基金资助:
    Project supported by the Shandong Provincial Foundation for the Encouragement of Distinguished Young and Middle-Aged Scientists (Grant No. 98022), China.

SPIN POLARIZATION IN A MODEL QUANTUM WIRE WITH A CROSS-SECTION

Wang Chuan-kui (王传奎)ab, Wang Hong-song (王洪松)c, Zhang Qing-gang (张庆刚)a   

  1. a Department of Physics, Shandong Teachers University, Jinan 250014, China; b Department of Physics and Measurement Technology, Link$\ddot{\rm o}$ping University, S-58183, Link$\ddot{\rm o}$ping, Sweden; c Division of Postgraduate, Shandong Teachers University, Jinan 250014, China
  • Received:1998-08-04 Revised:1998-10-26 Online:1999-03-15 Published:1999-03-20
  • Supported by:
    Project supported by the Shandong Provincial Foundation for the Encouragement of Distinguished Young and Middle-Aged Scientists (Grant No. 98022), China.

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摘要： Numerical investigation of the electronic structure of a small closed quantum system fabricated on the two-dimensional electron gas forming on the interference between GaAs and AlxGa1-xAs is reported. The Kohn-Sham spin-density-fun ctional theory is applied. Self-consistent results show that the quantum system assumes unequal numbers of electrons for spin up and spin down because of the existence of bound states. The profiles of effective potential energies for spin up and spin down electrons are then found to be very different, which will result in different transmission coefficients. It is notable that this spin polarization is caused by the geometry of the nanostructure.

Abstract: Numerical investigation of the electronic structure of a small closed quantum system fabricated on the two-dimensional electron gas forming on the interference between GaAs and AlxGa1-xAs is reported. The Kohn-Sham spin-density-fun ctional theory is applied. Self-consistent results show that the quantum system assumes unequal numbers of electrons for spin up and spin down because of the existence of bound states. The profiles of effective potential energies for spin up and spin down electrons are then found to be very different, which will result in different transmission coefficients. It is notable that this spin polarization is caused by the geometry of the nanostructure.

中图分类号:  (Quantum wires)

  • 73.21.Hb
73.63.Nm (Quantum wires) 71.15.Mb (Density functional theory, local density approximation, gradient and other corrections) 71.70.Gm (Exchange interactions)