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Spin-Dependent Electron Properties of a Triple-Terminal Quantum Dot Structure
Authors:HAN Yu  GONG Wei-Jiang  WEI Guo-Zhu
Institution:1.Department of Physics, Liaoning University, Shenyang 110036, China ;2.College of Sciences, Northeastern University, Shenyang 110004, China ;3.International Center for Material Physics, Acadmia Sinica, Shenyang;110015, China
Abstract:Electron transport properties of a triple-terminal Aharonov-Bohm interferometer are theoretically studied. By applying a Rashba spin-orbit coupling to a quantum dot locally, we find that remarkable spin polarization comes about in the electron transport process with tuning the structure parameters, i.e., the magnetic flux or quantum dot levels. When the quantum dot levels are aligned with the Fermi level, there only appear spin polarization in this structure by the presence of an appropriate magnetic flux. However,in absence of magnetic flux spin polarization and spin separation can be simultaneously realized with the adjustment of quantum dot levels, namely, an incident electron from one terminal can select a specific terminal to depart from the quantum dots according to its spin state.
Keywords:quantum dot  electron transport  Rashba interaction  
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