Semiconductor few-electron quantum dot operated as a bipolar spin filter

2003/11/30 by Ronald Hanson, R. Hanson, Lieven M. K. Vandersypen +5 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall #quant-ph

paper · pdf · doi:10.1103/physrevb.70.241304

published as Phys. Rev. B 70, 241304 (2004) · 4 pages, 3 figures

openalex publication_date 2004/12/08 · arxiv created 2004/12/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We study the spin states of a few-electron quantum dot defined in a two-dimensional electron gas, by applying a large in-plane magnetic field. We observe the Zeeman splitting of the two-electron spin triplet states. Also, the one-electron Zeeman splitting is clearly resolved at both the zero-to-one and the one-to-two electron transition. Since the spin of the electrons transmitted through the dot is opposite at these two transitions, this device can be employed as an electrically tunable, bipolar spin filter. Calculations and measurements show that higher-order tunnel processes and spin-orbit interaction have a negligible effect on the polarization.

Citations

• Zeeman Energy and Spin Relaxation in a One-Electron Quantum Dot
• Single-shot read-out of an individual electron spin in a quantum dot

Cited by

• Effect of inelastic scattering on spin entanglement detection through current noise

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• Spin filter of electrons through a zeeman splitting single quantum dot
• Spin filling of a quantum dot derived from excited-state spectroscopy
• Zeeman Energy and Spin Relaxation in a One-Electron Quantum Dot
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• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates