Proposal for a phase-coherent thermoelectric transistor
Applied Physics Letters
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Giazotto, F., Robinson, J., Moodera, J., & Bergeret, F. (2014). Proposal for a phase-coherent thermoelectric transistor. Applied Physics Letters, 105 (062602)https://doi.org/10.1063/1.4893443
Identifying materials and devices which offer efficient thermoelectric effects at low temperature is a major obstacle for the development of thermal management strategies for low-temperature electronic systems. Superconductors cannot offer a solution since their near perfect electron-hole symmetry leads to a negligible thermoelectric response; however, here we demonstrate theoretically a superconducting thermoelectric transistor which offers unparalleled figures of merit of up to ~ 45 and Seebeck coefficients as large as a few mV/K at sub-Kelvin temperatures. The device is also phase-tunable meaning its thermoelectric response for power generation can be precisely controlled with a small magnetic field. Our concept is based on a superconductor-normal metal-superconductor interferometer in which the normal metal weak-link is tunnel coupled to a ferromagnetic insulator and a Zeeman split superconductor. Upon application of an external magnetic flux, the interferometer enables phase-coherent manipulation of thermoelectric properties whilst offering efficiencies which approach the Carnot limit.
External DOI: https://doi.org/10.1063/1.4893443
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245719