Dynamic spin-flip shot noise of mesoscopic transport through a toroidal carbon nanotube
1 School of Physics, Beijing Institute of Technology - Beijing 100081, China
2 Department of Physics, The University of Hong Kong - Pokfulam Road, Hong Kong, China
Received: 25 September 2014
Accepted: 19 December 2014
The shot noise in a toroidal carbon nanotube (TCN) interferometer under the perturbation of a rotating magnetic field (RMF) has been investigated. A general shot noise formula has been derived by calculating the current correlation. It was found that photon absorption and emission induce novel features of dynamic shot noise. The oscillatory behavior of shot noise and Fano factor vary with the Aharonov-Bohm (AB) magnetic flux, and they are sensitively dependent on the Zeeman energy, frequency of RMF, and source-drain bias. By adjusting the Zeeman energy, the AB oscillation structures of shot noise and Fano factor show valley-to-peak transformation. The shot noise increases nonlinearly with increasing the Zeeman energy and photon energy. The enhancement and asymmetry of shot noise can be attributed to the spin-flip effect.
PACS: 85.35.-p – Nanoelectronic devices / 73.23.-b – Electronic transport in mesoscopic systems / 73.63.Fg – Nanotubes
© EPLA, 2015