Double quantum dot as detector of spin bias

Abstract

It was proposed that a double quantum dot can be used to be a detector of spin bias. Electron transport through a double quantum dot is investigated theoretically when a pure spin bias is applied on two conducting leads contacted to the quantum dot. It is found that the spin polarization in the left and right dots may be induced spontaneously while the intra-dot levels are located within the spin bias window and breaks the left-right symmetry of the two quantum dots. As a result, a large current emerges. For an open external circuit an charge bias instead of a charge current will be induced in equilibrium, which is believed to be measurable according to the current nanotechnology. This method may provide a practical and whole electrical approach to detect the spin bias (or the spin current) by measuring the charge bias or current in a double quantum dot.

13 pages, 5 figures

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• Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system
• Detect Spinons via Spin Transport
• Spin-current Seebeck effect in quantum dot systems
• Spin Bias Measurement Based on a Quantum Point Contact
• Charge and spin transport through normal lead coupled to $s$-wave superconductor and a Majorana zero mode
• Effects of interdot hopping and Coulomb blockade on the thermoelectric properties of serially coupled quantum dots
• Detecting and Switching Magnetization of Stoner Nanograin in Non-local Spin Valve
• Detection of spin bias in four-terminal quantum-dot ring
• Current Rectification and Seebeck Coefficient of Serially Coupled Double Quantum Dots