Inelastic Cotunneling Current and Shot Noise of an InteractingQuantum Dot with Ferromagnetic Correlations |
| |
| Authors: | DONG Bing LEI Xiao-Lin Norman J.M. Horing |
| |
| Affiliation: | 1. Department of Physics, Shanghai Jiao Tong University, Shanghai 200030, China ;2. Department of Physics and Engineering Physics, StevensInstitute of Technology, Hoboken, New Jersey 07030, USA |
| |
| Abstract: | ![]()
We explore inelastic cotunneling through a strongly Coulomb-blockadedquantum dot attached to two ferromagnetic leads in the weak coupling limit using a generic quantum Langevin equation approach. We first develop a Bloch-type equation microscopically to describe thecotunneling-induced spin relaxation dynamics, and then develop explicitanalytical expressions for the local magnetization, current, and itsfluctuations. On this basis, we predict a novel zero-bias anomaly ofthe differential conductance in the absence of a magnetic field for theanti-parallel configuration, and asymmetric peak splitting in a magnetic field. Also, for the same system with large polarization, we find a negativezero-frequency differential shot noise in the low positive bias-voltageregion. All these effects are ascribed to rapid spin-reversal due tounderlying spin-flip cotunneling. |
| |
| Keywords: | quantum dot spin polarized tunneling cotunneling |
|
| 点击此处可从《理论物理通讯》浏览原始摘要信息 |
|
点击此处可从《理论物理通讯》下载全文 |
|
