Magnon-driven quantum-dot heat engine
Bj\"orn Sothmann, Markus B\"uttiker

TL;DR
This paper explores a quantum-dot heat engine that converts thermal energy into spin-polarized or pure spin currents, demonstrating optimal efficiency and power in specific magnetic configurations.
Contribution
It introduces a quantum-dot based heat engine capable of converting heat into spin-polarized and pure spin currents with optimal performance in different magnetic alignments.
Findings
Acts as an optimal heat to spin-polarized charge current converter in antiparallel geometry.
Converts heat to pure spin current in parallel configuration.
Discusses maximal output power and efficiency of the device.
Abstract
We investigate a heat- to charge-current converter consisting of a single-level quantum dot coupled to two ferromagnetic metals and one ferromagnetic insulator held at different temperatures. We demonstrate that this nano engine can act as an optimal heat to spin-polarized charge current converter in an antiparallel geometry, while it acts as a heat to pure spin current converter in the parallel case. We discuss the maximal output power of the device and its efficiency.
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