Molecular states in carbon nanotube double quantum dots
M.R. Graeber, W.A. Coish, C. Hoffmann, M. Weiss, J. Furer, S., Oberholzer, D. Loss, and C. Schoenenberger
TL;DR
This study investigates molecular states in a carbon nanotube double quantum dot system, revealing strong inter-dot coupling and detailed characterization of molecular states via transport measurements.
Contribution
It demonstrates the formation of tunnel-coupled molecular states in a carbon nanotube double quantum dot with precise extraction of tunnel coupling parameters.
Findings
Observation of tunnel-coupled molecular states
Precise measurement of inter-dot tunnel coupling
Identification of molecular states through differential conductance
Abstract
We report electrical transport measurements through a semiconducting single-walled carbon nanotube (SWNT) with three additional top-gates. At low temperatures the system acts as a double quantum dot with large inter-dot tunnel coupling allowing for the observation of tunnel-coupled molecular states extending over the whole double-dot system. We precisely extract the tunnel coupling and identify the molecular states by the sequential-tunneling line shape of the resonances in differential conductance.
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