Donarini, Andrea and Niklas, Michael and Schafberger, Michael and Paradiso, Nicola and Strunk, Christoph and Grifoni, Milena (2019) Coherent population trapping by dark state formation in a carbon nanotube quantum dot. NATURE COMMUNICATIONS, 10: 381. ISSN 2041-1723,
Full text not available from this repository. (Request a copy)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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON-TRANSPORT; SPIN; INTERFERENCE; TRANSITIONS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Apr 2020 06:58 |
| Last Modified: | 27 Apr 2020 06:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27710 |
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