Quantum Transport in Ladder-Type Networks: Role of nonlinearity, topology and spin

Details Quantum Transport in Ladder-Type Networks: Role of nonlinearity, topology and spin Quantum Transport in Ladder-Type Networks: Role of nonlinearity, topology and spin

2009-09-13

arxiv.org/abs/0909.2401v1

J. Phys. A: Math. Theor. 43 (2010) 145101

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 16 figures

Scientific paper

We investigate quantum transport of electrons, phase solitons, etc. through mesoscopic networks of zero-dimensional quantum dots. Straight and circular ladders are chosen as networks with each coupled with three semi-infinite leads (with one incoming and the other two outgoing). Two transmission probabilities (TPs) as a function of the incident energy $\epsilon$ show a transition from anti-phase aperiodic to degenerate periodic spectra at the critical energy $\epsilon_c$ which is determined by a bifurcation point of the bulk energy dispersions. TPs of the circular ladder depend only on the parity of the winding number. Introduction of a single missing bond (MB) or missing step doubles the period of the periodic spectra at $\epsilon>\epsilon_c$ . Shift of the MB by lattice constant results in a striking switching effect at $\epsilon<\epsilon_c$. In the presence of the electric-field induced spin-orbit interaction (SOI), an obvious spin filtering occurs against the spin-unpolarized injection. Against the spin-polarized injection, on the other hand, the spin transport shows spin-flip (magnetization reversal) oscillations with respect to SOI. We also show a role of soliton in the context of its transport through the ladder networks.

Affiliated with

Also associated with

No associations

Rating

Quantum Transport in Ladder-Type Networks: Role of nonlinearity, topology and spin does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Quantum Transport in Ladder-Type Networks: Role of nonlinearity, topology and spin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum Transport in Ladder-Type Networks: Role of nonlinearity, topology and spin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-628784