Starts 19 Sep 2017 15:15

Ends 19 Sep 2017 16:15

Central European Time

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CMSP Special Series of Lectures on Nanomechanics meets Spintronics - Part II: Spin Blockade Based Mesoscopic Heat Engine

Starts 19 Sep 2017 15:15

Ends 19 Sep 2017 16:15

Central European Time

ICTP

Leonardo Building - Euler Lecture Hall

I will consider a mesoscopic nanomechanical weak link where electronic transport between leads is blocked by a spin blockade. Namely, a suspended nanowire which is coupled to two oppositely polarized half-metals and subjected to a nonuniform magnetic field. It will be shown that in such system a temperature drop between the leads can significantly affect the dynamics of a mechanical degree of freedom. In particular, it is demonstrated that, under certain conditions, the stationary distribution of the mechanical subsystem has a Boltzmann form with an effective temperature, which is lower than the temperature of the “cold” lead; this seems rather counterintuitive. We also find that a change in the direction of the temperature gradient can result in the generation of mechanical vibrations rather than the heating of the mechanical subsystem. Therefore, the system resembles a nanoelectromechanical heat engine. We derive a criterion for the mechanical instability and estimate the amplitude of the resulting self-sustained oscillations.

1. J Atalaya, LY Gorelik, Spintronics-based mesoscopic heat engine Physical Review B 85 , 245309, (2012); P Stadler, W Belzig and G Rastelli, Ground state cooling of a carbon nano-mechanical resonator by spin-polarized current. Phys. Rev. Lett. 113, 047201 (2014)

2. A. Vikström, A. M. Eriksson, S. I. Kulinich, and L. Y. Gorelik, Nanoelectromechanical heat engine based on electron-electron interaction, Phys. Rev. Lett. 117, 247701, 2016

1. J Atalaya, LY Gorelik, Spintronics-based mesoscopic heat engine Physical Review B 85 , 245309, (2012); P Stadler, W Belzig and G Rastelli, Ground state cooling of a carbon nano-mechanical resonator by spin-polarized current. Phys. Rev. Lett. 113, 047201 (2014)

2. A. Vikström, A. M. Eriksson, S. I. Kulinich, and L. Y. Gorelik, Nanoelectromechanical heat engine based on electron-electron interaction, Phys. Rev. Lett. 117, 247701, 2016