Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.46409

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 46, 459–467 (2006)

SPIN CONDUCTANCE OF THE QUANTUM WIRE
A. Dargys
Semiconductor Physics Institute, A. Goštauto 11, LT-01108 Vilnius, Lithuania
E-mail: dargys@pfi.lt

Received 11 September 2006

The electron spin transport along a semiconducting quantum wire connected to spin-unpolarized electron reservoirs and the spin filtering properties of the wire are investigated. The wire is immersed in a magnetic field that is perpendicular to the wire axis and substrate plane on which the wire is grown. The lateral confining potential is assumed to be parabolic. The spin–orbit interaction is included via Rashba Hamiltonian that in conjunction with the Zeeman Hamiltonian determines the spin conductance of the wire. Dependences of the spin current and conductance on the voltage applied over the ends of the wire as well as on the magnetic field strength are analysed.

Keywords: quantum wire, spin transport, spin conductance

PACS: 73.21.La, 73.63.Nm, 85.35.Be, 85.75.-d, 67.57.Lm

KVANTINĖS VIELOS SUKININIS LAIDUMAS
A. Dargys
Puslaidininkių fizikos institutas, Vilnius, Lietuva

Išnagrinėta elektrono sukinio pernaša išilgai kvantinės vielos, kurios galai prijungti prie nepoliarizuotų elektronų rezervuarų, taip pat išnagrinėti kvantinės vielos sukinio filtravimo ypatumai. Sprendžiant uždavinį buvo padaryta prielaida, kad vielos plotį lemiantis potencialas turi parabolinį pavidalą, o magnetinis laukas yra statmenas vielos ašiai ir padėklui, ant kurio užauginta viela. Į sąveika tarp elektrono sukinio ir jo orbitinio judėjimo yra atsižvelgta per Rašbos (Rashba) pasiūlytą hamiltonianą, kuris kartu su Zėmano (Zeeman) hamiltonianu lemia sukinio srovės stiprį kvantinėje vieloje. Išnagrinėta sukinio srovės (laidumo) priklausomybė tiek nuo įtampos tarp kvantinės vielos galų, tiek nuo magnetinio lauko stiprio. Sukininio laidumo savybės straipsnyje pailiustruotos piešiniais.

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