Switchable Coupling of Vibrations to Two-Electron Carbon-Nanotube Quantum Dot States Article Swipe

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Carbon nanotube Quantum dot Carbon nanotube quantum dot Excited state Coupling (piping) Electron Condensed matter physics Vibration Magnetic field Exchange interaction Materials science Spin (aerodynamics) Molecular physics Physics Nanotube Atomic physics Nanotechnology Quantum mechanics Ferromagnetism Thermodynamics Metallurgy

P. Weber , Hernán L. Calvo , J. Bohle , Karin Goß , Carola Meyer , M. R. Wegewijs , Christoph Stampfer ·

YOU? · · 2015 · Open Access · · DOI: https://doi.org/10.1021/acs.nanolett.5b00765 · OA: W1629294882

We report transport measurements on a quantum dot in a partly suspended carbon nanotube. Electrostatic tuning allows us to modify and even switch "on" and "off" the coupling to the quantized stretching vibration across several charge states. The magnetic-field dependence indicates that only the two-electron spin-triplet excited state couples to the mechanical motion, indicating mechanical coupling to both the valley degree of freedom and the exchange interaction, in contrast to standard models.