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Metallic carbon nanotube quantum dots with broken symmetries as a platform for tunable terahertz detection

Gilles Buchs1,2, Magdalena Marganska3, Jhon W. González4,5,6, Kristjan Eimre7*, Carlo A. Pignedoli7, Daniele Passerone7, Andres Ayuela4,5, Oliver Gröning7, Dario Bercioux5,8

1 Silicon Quantum Computing, Sydney, NSW 2052, Australia

2 School of Physics, UNSW Sydney, Sydney, NSW 2052, Australia

3 Institute of Theoretical Physics, Regensburg University, 93 053 Regensburg, Germany

4 Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, E-20018 Donostia-San Sebastián, Spain

5 Donostia International Physics Center (DIPC), Manuel de Lardizabal 4, E-20018 San Sebastían, Spain

6 Departamento de Física, Universidad Técnica Federico Santa María, Casilla Postal 110V, Valparaíso, Chile

7 Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland

8 IKERBASQUE, Basque Foundation for Science, Euskadi Plaza, 5, 48009 Bilbao, Spain

* Corresponding authors emails: kristjan.eimre@empa.ch
DOI10.24435/materialscloud:vk-wp [version v1]

Publication date: Nov 02, 2021

How to cite this record

Gilles Buchs, Magdalena Marganska, Jhon W. González, Kristjan Eimre, Carlo A. Pignedoli, Daniele Passerone, Andres Ayuela, Oliver Gröning, Dario Bercioux, Metallic carbon nanotube quantum dots with broken symmetries as a platform for tunable terahertz detection, Materials Cloud Archive 2021.186 (2021), doi: 10.24435/materialscloud:vk-wp.


In this record we provide data to support our recent findings related to carbon nanotube based quantum dots for tunable terahertz detection. Generating and detecting radiation in the technologically relevant range of the so-called terahertz gap (0.1–10 THz) is challenging because of a lack of efficient sources and detectors. Quantum dots in carbon nanotubes have shown great potential to build sensitive terahertz detectors, usually based on photon-assisted tunneling. A recently reported mechanism combining resonant quantum dot transitions and tunneling barrier asymmetries results in a narrow linewidth photocurrent response with a large signal-to-noise ratio under weak THz radiation. That device was sensitive to one frequency, corresponding to transitions between equidistant quantized states. In this work we show, using numerical simulations together with scanning tunneling spectroscopy studies of a defect-induced metallic zigzag single-walled carbon nanotube quantum dot, that breaking simultaneously various symmetries in metallic nanotube quantum dots of arbitrary chirality strongly relaxes the selection rules in the electric dipole approximation and removes energy degeneracies. This leads to a richer set of allowed optical transitions spanning frequencies from 1 THz to several tens of THz, for a ∼10 nm quantum dot. Based on these findings, we propose a terahertz detector device based on a metallic single-walled carbon nanotube quantum dot defined by artificial defects. Depending on its length and contacts transparency, the operating regimes range from a high-resolution gate-tunable terahertz sensor to a broadband terahertz detector. Our calculations indicate that the device is largely unaffected by temperatures up to 100 K, making carbon nanotube quantum dots with broken symmetries a promising platform to design tunable terahertz detectors that could operate at liquid nitrogen temperatures.

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External references

Journal reference (manuscript where the results are discussed)
G. Buchs, M. Marganska, J. W. González, K. Eimre, C. A. Pignedoli, D. Passerone, A. Ayuela, O. Gröning, and D. Bercioux, Appl. Phys. Rev. 8, 021406 (2021). doi:10.1063/5.0018944


carbon nanotubes terahertz detector ab initio MARVEL/DD3 SNSF CSCS

Version history:

2021.186 (version v1) [This version] Nov 02, 2021 DOI10.24435/materialscloud:vk-wp