{
  "meta": {
    "api_type": "NWO Projects API",
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    "licence": {
      "name": "CC0 1.0 Universal",
      "url": "https://creativecommons.org/publicdomain/zero/1.0",
      "description": "To the extent possible under law, all copyright and related or neighbouring rights have been waived worldwide to the data made available through this API."
    },
    "documentation": "https://doi.org/10.5281/zenodo.14918287",
    "release_date": "2025-08-20T00:00:00",
    "funder": "https://doi.org/10.13039/501100003246",
    "ror_id": "https://ror.org/04jsz6e67",
    "date": "2026-11-05T00:00:00",
    "count": 1,
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  },
  "projects": [
    {
      "project_id": "680-47-424",
      "title": "Unveiling the topological quantum state in high magnetic fields",
      "funding_scheme_id": 472,
      "funding_scheme": "NWO-Talentprogramma Veni 2012 N",
      "department": "Exacte en Natuurwetenschappen",
      "sub_department": "Natuurkunde",
      "start_date": "2012-11-01T00:00:00",
      "end_date": "2016-03-18T00:00:00",
      "reporting_year": 2012,
      "summary_nl": "The recent discovery of \"topological insulators\" has led to a very rapidly growing interest in condensed matter physics. Topological insulators (TIs) are characterized by a bulk band gap as for ordinary insulators but with topologically protected conducting states on their edge (2D) or on the surface (3D). This new state of matter is a consequence of combined strong spin-orbit interaction and time-reversal symmetry. The unique metallic surface states where electrons behave as massless Dirac fermions carry electrical as well as spin currents with a high mobility and favour forward motion over back scattering at impurities in contrast to metals and semiconductors. Due to this peculiar property, TIs are expected to play a crucial role in realizing new information devices.\n\n\n\nThis proposal is devoted to a fundamental understanding of TIs combining two steps: characterize and optimize the most promising samples on 2D HgTe structures, 3D HgTe and Bi2Se3, and measure basic physical properties by means of transport and thermopower in high magnetic fields. Thermoelectric measurements provide the most fundamental information since they are directly related to entropy.  Magnetic fields play a crucial role to investigate TIs because bulk and surface/edge states show different signatures, in particular, evidence for 2D surfaces states can be found in measurements of quantum oscillations and eventually a surface quantum Hall effect for high-quality materials.\n\n\n\nThe close collaboration between development of new microstructures in different materials with high-field experiments does not only offer the possibility to gain further basic knowledge about the peculiar properties of this new state of matter but is also expected to contribute to create prototype devices on topological insulators. If these materials can be successfully implemented in devices, significant less energy is needed for future information devices.\n\n",
      "summary_en": "The recent discovery of \"topological insulators\" has led to a very rapidly growing interest in condensed matter physics. Topological insulators (TIs) are characterized by a bulk band gap as for ordinary insulators but with topologically protected conducting states on their edge (2D) or on the surface (3D). This new state of matter is a consequence of combined strong spin-orbit interaction and time-reversal symmetry. The unique metallic surface states where electrons behave as massless Dirac fermions carry electrical as well as spin currents with a high mobility and favour forward motion over back scattering at impurities in contrast to metals and semiconductors. Due to this peculiar property, TIs are expected to play a crucial role in realizing new information devices.\n\n\n\nThis proposal is devoted to a fundamental understanding of TIs combining two steps: characterize and optimize the most promising samples on 2D HgTe structures, 3D HgTe and Bi2Se3, and measure basic physical properties by means of transport and thermopower in high magnetic fields. Thermoelectric measurements provide the most fundamental information since they are directly related to entropy.  Magnetic fields play a crucial role to investigate TIs because bulk and surface/edge states show different signatures, in particular, evidence for 2D surfaces states can be found in measurements of quantum oscillations and eventually a surface quantum Hall effect for high-quality materials.\n\n\n\nThe close collaboration between development of new microstructures in different materials with high-field experiments does not only offer the possibility to gain further basic knowledge about the peculiar properties of this new state of matter but is also expected to contribute to create prototype devices on topological insulators. If these materials can be successfully implemented in devices, significant less energy is needed for future information devices.\n\n",
      "project_members": [
        {
          "role": "Project leader",
          "member_id": 247019,
          "last_name": "Wiedmann",
          "degree_pre_nominal": "dr.",
          "initials": "S.R.",
          "first_name": "Steffen",
          "organisation": "Radboud Universiteit Nijmegen||Faculteit der Natuurwetenschappen, Wiskunde en Informatica||Institute for Molecules and Materials (IMM)",
          "organisation_id": 79554,
          "ror": "https://ror.org/016xsfp80",
          "active": false
        },
        {
          "role": "Researcher",
          "member_id": 247019,
          "last_name": "Wiedmann",
          "degree_pre_nominal": "dr.",
          "initials": "S.R.",
          "first_name": "Steffen",
          "organisation": "Radboud Universiteit Nijmegen||Faculteit der Natuurwetenschappen, Wiskunde en Informatica||Institute for Molecules and Materials (IMM)",
          "organisation_id": 79554,
          "ror": "https://ror.org/016xsfp80",
          "active": false
        },
        {
          "role": "Main Applicant",
          "member_id": 247019,
          "last_name": "Wiedmann",
          "degree_pre_nominal": "dr.",
          "initials": "S.R.",
          "first_name": "Steffen",
          "organisation": "Radboud Universiteit Nijmegen||Faculteit der Natuurwetenschappen, Wiskunde en Informatica||Institute for Molecules and Materials (IMM)",
          "organisation_id": 79554,
          "ror": "https://ror.org/016xsfp80",
          "active": true
        }
      ]
    }
  ]
}