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


JSON Export

{
  "metadata": {
    "is_last": true, 
    "publication_date": "Nov 02, 2021, 14:44:26", 
    "edited_by": 578, 
    "version": 1, 
    "license": "Creative Commons Attribution 4.0 International", 
    "license_addendum": null, 
    "_files": [
      {
        "checksum": "md5:59446ffda5b626fe7ef2700df529c842", 
        "key": "ReadMe.yaml", 
        "size": 3166, 
        "description": "ReadMe file in yaml format detailing the content of the record"
      }, 
      {
        "checksum": "md5:befde97e8243bb2df274e24e822c8571", 
        "key": "data.tgz", 
        "size": 3019992, 
        "description": "Compressed tar file containing the files of the record"
      }
    ], 
    "mcid": "2021.186", 
    "keywords": [
      "carbon nanotubes", 
      "terahertz detector", 
      "ab initio", 
      "MARVEL/DD3", 
      "SNSF", 
      "CSCS"
    ], 
    "contributors": [
      {
        "givennames": "Gilles", 
        "familyname": "Buchs", 
        "affiliations": [
          "Silicon Quantum Computing, Sydney, NSW 2052, Australia", 
          "School of Physics, UNSW Sydney, Sydney, NSW 2052, Australia"
        ]
      }, 
      {
        "givennames": "Magdalena", 
        "familyname": "Marganska", 
        "affiliations": [
          "Institute of Theoretical Physics, Regensburg University, 93 053 Regensburg, Germany"
        ]
      }, 
      {
        "givennames": "Jhon W.", 
        "familyname": "Gonz\u00e1lez", 
        "affiliations": [
          "Centro de F\u00edsica de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, E-20018 Donostia-San Sebasti\u00e1n, Spain", 
          "Donostia International Physics Center (DIPC), Manuel de Lardizabal 4, E-20018 San Sebast\u00edan, Spain", 
          "Departamento de F\u00edsica, Universidad T\u00e9cnica Federico Santa Mar\u00eda, Casilla Postal 110V, Valpara\u00edso, Chile"
        ]
      }, 
      {
        "givennames": "Kristjan", 
        "email": "kristjan.eimre@empa.ch", 
        "familyname": "Eimre", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "givennames": "Carlo A.", 
        "familyname": "Pignedoli", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "givennames": "Daniele", 
        "familyname": "Passerone", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "givennames": "Andres", 
        "familyname": "Ayuela", 
        "affiliations": [
          "Centro de F\u00edsica de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, E-20018 Donostia-San Sebasti\u00e1n, Spain", 
          "Donostia International Physics Center (DIPC), Manuel de Lardizabal 4, E-20018 San Sebast\u00edan, Spain"
        ]
      }, 
      {
        "givennames": "Oliver", 
        "familyname": "Gro\u0308ning", 
        "affiliations": [
          "Empa - Swiss Federal Laboratories for Materials Science and Technology, \u00dcberlandstrasse 129, 8600 D\u00fcbendorf, Switzerland"
        ]
      }, 
      {
        "givennames": "Dario", 
        "familyname": "Bercioux", 
        "affiliations": [
          "Donostia International Physics Center (DIPC), Manuel de Lardizabal 4, E-20018 San Sebast\u00edan, Spain", 
          "IKERBASQUE, Basque Foundation for Science, Euskadi Plaza, 5, 48009 Bilbao, Spain"
        ]
      }
    ], 
    "status": "published", 
    "doi": "10.24435/materialscloud:vk-wp", 
    "title": "Metallic carbon nanotube quantum dots with broken symmetries as a platform for tunable terahertz detection", 
    "id": "1070", 
    "description": "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\u201310\u2009THz) 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\u2009THz to several tens of THz, for a \u223c10\u2009nm 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\u2009K, making carbon nanotube quantum dots with broken symmetries a promising platform to design tunable terahertz detectors that could operate at liquid nitrogen temperatures.", 
    "owner": 26, 
    "_oai": {
      "id": "oai:materialscloud.org:1070"
    }, 
    "conceptrecid": "1069", 
    "references": [
      {
        "doi": "10.1063/5.0018944", 
        "comment": "manuscript where the results are discussed", 
        "citation": "G. Buchs, M. Marganska, J. W. Gonz\u00e1lez, K. Eimre, C. A. Pignedoli, D. Passerone, A. Ayuela, O. Gr\u00f6ning, and D. Bercioux, Appl. Phys. Rev. 8, 021406 (2021).", 
        "type": "Journal reference"
      }
    ]
  }, 
  "updated": "2021-11-02T13:44:26.054789+00:00", 
  "revision": 7, 
  "id": "1070", 
  "created": "2021-10-26T07:59:55.552456+00:00"
}