Tunable pure spin currents in a triple-quantum-dot ring

2008/01/28 by Weijiang Gong, Yisong Zheng, Tianquan Lv +1 · 62 citations
Physics and Astronomy · #Charge (physics) #Current (fluid) #Magnetic field #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #Spin current #Spin polarization #Spinplasmonics #Topological Materials and Phenomena #Zero field splitting #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.1063/1.2838310

published in Applied Physics Letters 92(4) (American Institute of Physics) · 5 pages, 2 Figures

openalex publication_date 2008/01/28 · arxiv created 2008/08/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Electronic transport through a triple-quantum-dot ring with three terminals is theoretically studied. By introducing local Rashba spin-orbit interaction on an individual quantum dot, we calculate the charge and spin currents in one lead. We find that a pure spin current without an accompanying charge current appears even at zero magnetic field case. The polarization direction of the spin current can be inverted by altering the bias voltage. In addition, by tuning the magnetic field strength, the charge and spin currents reach their respective peaks alternately.

Citations

• Time-dependent transport in interacting and non-interacting mesoscopic systems
• Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
• Oscillatory effects and the magnetic susceptibility of carriers in inversion layers
• Pure Spin Current from One-Photon Absorption of Linearly Polarized Light in Noncentrosymmetric Semiconductors
• Quantum transport theory for nanostructures with Rashba spin-orbital interaction
• Spintronics: Fundamentals and applications
• Decoherence of transported spin in multichannel spin-orbit-coupled spintronic devices: Scattering approach to spin-density matrix from the ballistic to the localized regime
• Landauer formula for the current through an interacting electron region
• Dissipationless Quantum Spin Current at Room Temperature

Cited by

• Detection of spin bias in a four-terminal quantum-dot ring