Emergent Relativistic Effects in Condensed Matter
From Fundamental Aspects to Electronic Functionality

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22.01.2019

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

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. A. Donarini, M. Niklas, M. Schafberger, N. Paradiso, C. Strunk, M. Grifoni, Nature Communications 10, 381 (2019)


https://www.nature.com/articles/s41467-018-08112-x
https://www.ur.de/pressearchiv/pressemitteilung/951982.html

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Doris Meier
Universit├Ąt Regensburg

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