Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 98: Transport: Nanomechanics

TT 98.3: Talk

Thursday, April 3, 2014, 15:30–15:45, BEY 81

Cooling a nanomechanical resonator using spin-dependent transport — •Pascal Stadler¹, Gianluca Rastelli², and Wolfgang Belzig¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — ²Zukunftskolleg, Fachbereich Physik, Universität Konstanz, 78457, Konstanz, Germany

We study spin-dependent transport in a quantum dot contacted to two ferromagnets and magnetically coupled to a nanomechanical oscillator in the quantum regime. Due to the magneto-vibrational coupling, the nanomechanical oscillator induces spin-flips of the electrons on the quantum dot. In such a spin-valve, owing to the sensitivity of the electron transport to the spin orientation, signatures of the nanomechanical motion appears in the I-V characteristic even for weak spin-vibrational coupling. Additionally, the feed-back action of the spin-polarized current on the state of the oscillator leads to an active cooling of the oscillator’s eigenmode controlled by the applied voltage to the leads and by the parallel or antiparallel magnetization configuration.