Coherent population trapping by dark state formation in a carbon nanotube quantum dot

Andrea Donarini, Michael Niklas, Michael Schafberger, Nicola Paradiso, Christoph Strunk () and Milena Grifoni ()
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Andrea Donarini: University of Regensburg
Michael Niklas: University of Regensburg
Michael Schafberger: University of Regensburg
Nicola Paradiso: University of Regensburg
Christoph Strunk: University of Regensburg
Milena Grifoni: University of Regensburg

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Illumination of atoms by resonant lasers can pump electrons into a coherent superposition of hyperfine levels which can no longer absorb the light. Such superposition is known as a dark state, because fluorescent light emission is then suppressed. Here we report an all-electric analogue of this destructive interference effect in a carbon nanotube quantum dot. The dark states are a coherent superposition of valley (angular momentum) states which are decoupled from either the drain or the source leads. Their emergence is visible in asymmetric current−voltage characteristics, with missing current steps and current suppression which depend on the polarity of the applied source-drain bias. Our results demonstrate coherent-population trapping by all-electric means in an artificial atom.

Date: 2019
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DOI: 10.1038/s41467-018-08112-x

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