Switchable Coupling of Vibrations to Two-Electron Carbon-Nanotube Quantum Dot States
arXiv:1506.05137 · doi:10.1021/acs.nanolett.5b00765
Abstract
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.
References in corpus (14)
- A tunable carbon nanotube electromechanical oscillator
- Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
- Franck-Condon blockade and giant Fano factors in transport through single molecules
- Nanomechanical motion measured with precision beyond the standard quantum limit
- Strong coupling between single-electron tunneling and nano-mechanical motion
- Franck-Condon blockade in suspended carbon nanotube quantum dots
- Vibrational sidebands and dissipative tunneling in molecular transistors
- Tunneling in suspended carbon nanotubes assisted by longitudinal phonons
- Nanotube mechanical resonators with quality factors of up to 5 million
- Kinetic Equations for Transport Through Single-Molecule Transistors
- Valley-spin blockade and spin resonance in carbon nanotubes
- Electronic excitation spectrum of metallic carbon nanotubes
- Bends In Nanotubes Allow Electric Spin Control and Coupling
- Coupling carbon nanotube mechanics to a superconducting circuit