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

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.

SUBMITTER: Donarini A

PROVIDER: S-EPMC6343009 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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

Donarini Andrea A Niklas Michael M Schafberger Michael M Paradiso Nicola N Strunk Christoph C Grifoni Milena M

Nature communications 20190122 1

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 l ...[more]

PMID: 30670686

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