Ballistic conductance in kane type semiconductor quantum wire


BABANLI A. , BAHCELI S., ALTUG D. T.

EUROPEAN PHYSICAL JOURNAL B, cilt.73, ss.133-138, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 73 Konu: 1
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1140/epjb/e2009-00399-4
  • Dergi Adı: EUROPEAN PHYSICAL JOURNAL B
  • Sayfa Sayıları: ss.133-138

Özet

The energy spectrum, ballistic conductance of an electron on the surface of a Kane type semiconductor hollow cylinder has been calculated by using the Kane equation with an additional term that takes into account the spin-orbit (SO) interaction. This term, known as Rashba term, occurs for asymmetric quantum wells, where two directions on the normal n are physically nonequivalent. If Rashba spin-orbital interaction is incorporated into energy spectrum, it leads to the emergence of new extrema. We obtained electron energy spectrum, which depends on the sign of the effective spin orbital constant. The energy spectrum of electrons has two branches when the magnetic field does not exist. One of these branches has only one minimum while the other branch has one maximum around k = 0 and two minima. The external magnetic field can control these extrema which occur in the event transport. The results were used to obtain the ballistic conductance at finite temperature of the Kane type hollow cylinder. It has been found that the presence of additional local extremum points in the subband of the electronic spectrum leads to a nonmonotonic dependence of the ballistic conductance of the system on the chemical potential. The g-factor of electrons was observed to depend on Rashba parameter in a linear manner. The effect of finite temperature smears out the sharp steps in the zero-temperature conductance.