Switchable Coupling of Vibrations to Two-Electron Carbon-Nanotube Quantum Dot States.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 26060894.
- Also identified by DOI 10.1021/acs.nanolett.5b00765.
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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.