Eur. Phys. J. B 47, 295-303 (2005)
https://doi.org/10.1140/epjb/e2005-00324-y

Spin-flip mesoscopic transport through a quantum dot coupled to carbon nanotube terminals

¹ CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China
² Department of Physics, Beijing Institute of Technology, Beijing 100081, P.R. China

Corresponding author: ^a zhaohonk@yahoo.com

Received: 8 April 2005
Revised: 30 May 2005
Published online: 11 October 2005

Abstract

We investigate mesoscopic transport through a system that consists of a central quantum dot (QD) and two single-wall carbon nanotube (SWCN) leads in the presence of a rotating magnetic field. The spin-flip effect is induced by the rotating magnetic field, and the tunnelling current is sensitively related to the spin-flip effect. We present the calculations of charge and spin current components to show the intimate relations to the SWCN leads. Zeeman effect is important when the applied magnetic field is strong enough. The current characteristics are quite different when the source-drain bias is zero (eV=0) and nonzero (). The asymmetric peak and valley of spin current versus gate voltage exhibit Fano resonance. Multi-resonant peaks of spin current versus photon energy reflect the structure of CN quantum wires, as well as the resonant photon absorption and emission effect. The matching-mismatching of channels in the CN leads and QD results in novel spin current structure by tuning the frequency.