Control of vibrational states by spin-polarized transport in a carbon nanotube resonator

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We study spin-dependent transport in a suspended carbon nanotube quantum dot in contact with two ferromagnetic leads and with the dot's spin coupled to the flexural mechanical modes. The spin-vibration interaction induces spin-flip processes between the two energy levels of the dot. This interaction arises from the spin-orbit coupling or a magnetic field gradient. The inelastic vibration-assisted spin flips give rise to a mechanical damping and, for an applied bias voltage, to a steady nonequilibrium occupation of the harmonic oscillator. We analyze these effects as function of the energy-level separation of the dot and the magnetic polarization of the leads. Depending on the magnetic configuration and the bias-voltage polarity, we can strongly cool a single mode or pump energy into it. In the latter case, we find that within our approximation, the system approaches eventually a regime of mechanical instability. Furthermore, owing to the sensitivity of the electron transport to the spin orientation, we find signatures of the nanomechanical motion in the current-voltage characteristic. Hence, the vibrational state can be read out in transport measurements.

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530 Physik
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Physics - Mesoscopic Systems and Quantum Hall Effect
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ISO 690STADLER, Pascal, Wolfgang BELZIG, Gianluca RASTELLI, 2015. Control of vibrational states by spin-polarized transport in a carbon nanotube resonator. In: Physical Review B. 2015, 91(8), 085432. ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.91.085432
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@article{Stadler2015Contr-30415,
  year={2015},
  doi={10.1103/PhysRevB.91.085432},
  title={Control of vibrational states by spin-polarized transport in a carbon nanotube resonator},
  number={8},
  volume={91},
  issn={1098-0121},
  journal={Physical Review B},
  author={Stadler, Pascal and Belzig, Wolfgang and Rastelli, Gianluca},
  note={Article Number: 085432}
}
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