{ "meta": { "api_type": "NWO Projects API", "version": "1.0.2", "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, "per_page": 100, "pages": 1, "page": 1 }, "projects": [ { "project_id": "680-47-514", "title": "Atomically assembled quantum spin liquids", "funding_scheme_id": 857, "funding_scheme": "NWO-Talentprogramma Vidi 2011 N", "department": "Exacte en Natuurwetenschappen", "sub_department": "Natuurkunde", "start_date": "2012-11-01T00:00:00", "end_date": "2017-11-01T00:00:00", "reporting_year": 2012, "summary_nl": "A quantum spin liquid (QSL) is a magnetic system that does not settle into a long-range ordered configuration, even at zero temperature. Instead it resides in a nontrivial quasi-disordered ground state. QSLs form ideal breeding grounds for exotic excitations, which in turn lead to fascinating phenomena. Examples include high-Tc superconductivity as well as the actively sought-after Majorana states. For decades, research in this field consisted mainly of theoretical debate. Experimental realizations of QSLs are being explored, but suitable chemical compounds are difficult to find and little can be done to tune their precise atomic geometries.\n\nHere I propose to construct quantum spin liquids through a dramatically new approach. I intend to build lattices of magnetic atoms from the bottom up, literally atom-by-atom. Using the probe tip of a sub-Kelvin scanning tunneling microscope I will position the atoms on a surface into various one- and two-dimensional lattices, and with the same tip I will probe their spin states with atomic precision. The key indication for QSL behavior, the existence of an excitation gap due to lack of long-range order, should be readily observable through inelastic cotunneling spectroscopy. Among other things, these experiments will make it possible to carefully control and investigate various quantum phase transitions and may shed light on the dynamics of quasiparticle excitations. As an experimental approach, the technique presented here has the potential to revolutionize the field of quantum magnetism.", "summary_en": "A quantum spin liquid (QSL) is a magnetic system that does not settle into a long-range ordered configuration, even at zero temperature. Instead it resides in a nontrivial quasi-disordered ground state. QSLs form ideal breeding grounds for exotic excitations, which in turn lead to fascinating phenomena. Examples include high-Tc superconductivity as well as the actively sought-after Majorana states. For decades, research in this field consisted mainly of theoretical debate. Experimental realizations of QSLs are being explored, but suitable chemical compounds are difficult to find and little can be done to tune their precise atomic geometries.\n\nHere I propose to construct quantum spin liquids through a dramatically new approach. I intend to build lattices of magnetic atoms from the bottom up, literally atom-by-atom. Using the probe tip of a sub-Kelvin scanning tunneling microscope I will position the atoms on a surface into various one- and two-dimensional lattices, and with the same tip I will probe their spin states with atomic precision. The key indication for QSL behavior, the existence of an excitation gap due to lack of long-range order, should be readily observable through inelastic cotunneling spectroscopy. Among other things, these experiments will make it possible to carefully control and investigate various quantum phase transitions and may shed light on the dynamics of quasiparticle excitations. As an experimental approach, the technique presented here has the potential to revolutionize the field of quantum magnetism.", "project_members": [ { "role": "Researcher", "member_id": 283078, "last_name": "Toskovic", "degree_post_nominal": "MSc", "initials": "R.", "first_name": "Ranko", "organisation": "Onbekend", "organisation_id": 5229, "ror": "-", "active": false }, { "role": "Researcher", "member_id": 283079, "last_name": "Bryant", "degree_pre_nominal": "dr.", "initials": "B.E.H.", "first_name": "Benjamin", "organisation": "Onbekend", "organisation_id": 5229, "ror": "-", "active": false }, { "role": "Researcher", "member_id": 297285, "last_name": "Girovský", "degree_pre_nominal": "dr.", "initials": "J.", "first_name": "Ján", "organisation": "Onbekend", "organisation_id": 5229, "ror": "-", "active": false }, { "role": "Researcher", "member_id": 242961, "last_name": "Otte", "degree_pre_nominal": "prof. dr.", "initials": "A.F.", "first_name": "Sander", "organisation": "Technische Universiteit Delft||Faculteit Technische Natuurwetenschappen||NanoScience - Kavli Institute of Nanoscience Delft", "organisation_id": 74375, "ror": "https://ror.org/02e2c7k09", "active": false }, { "role": "Researcher", "member_id": 283271, "last_name": "Hoogerheide", "initials": "R.", "first_name": "Ron", "organisation": "Onbekend", "organisation_id": 5229, "ror": "-", "active": false }, { "role": "Researcher", "member_id": 302352, "last_name": "Kool", "initials": "T.", "first_name": "Tino", "organisation": "Onbekend", "organisation_id": 5229, "ror": "-", "active": false }, { "role": "Main Applicant", "member_id": 242961, "last_name": "Otte", "degree_pre_nominal": "prof. dr.", "initials": "A.F.", "first_name": "Sander", "organisation": "Technische Universiteit Delft||Faculteit Technische Natuurwetenschappen||NanoScience - Kavli Institute of Nanoscience Delft", "organisation_id": 74375, "ror": "https://ror.org/02e2c7k09", "active": true }, { "role": "Project leader", "member_id": 242961, "last_name": "Otte", "degree_pre_nominal": "prof. dr.", "initials": "A.F.", "first_name": "Sander", "organisation": "Technische Universiteit Delft||Faculteit Technische Natuurwetenschappen||NanoScience - Kavli Institute of Nanoscience Delft", "organisation_id": 74375, "ror": "https://ror.org/02e2c7k09", "active": true } ], "products": [ { "title": "Imaging of spin waves in atomically designed nanomagnets", "year": 2014, "edition": "13", "start": 782, "end": 785, "type": "Wetenschappelijk artikel", "journal_title": "Nature Materials", "authors": [ { "last_name": "Spinelli", "initials": "A.", "role": "Auteur", "index_number": 1 }, { "last_name": "Bryant", "initials": "B.", "role": "Auteur", "index_number": 2 }, { "last_name": "Delgado", "initials": "F.", "role": "Auteur", "index_number": 3 }, { "last_name": "Fernández-Rossier", "initials": "J.", "role": "Auteur", "index_number": 4 }, { "last_name": "Otte", "initials": "A. F.", "role": "Auteur", "index_number": 5 } ] }, { "title": "Atomically crafted spin lattices as model systems for quantum magnetism", "year": 2015, "edition": "27", "start": 243203, "end": 243203, "type": "Wetenschappelijk artikel", "journal_title": "Journal of Physics: Condensed Matter", "authors": [ { "last_name": "Spinelli", "initials": "A.", "role": "Auteur", "index_number": 1 }, { "last_name": "Rebergen", "initials": "M. P.", "role": "Auteur", "index_number": 2 }, { "last_name": "Otte", "initials": "A. F.", "role": "Auteur", "index_number": 3 } ] }, { "title": "Local control of single atom magneto-crystalline anisotropy", "year": 2013, "edition": "111", "start": 127203, "type": "Wetenschappelijk artikel", "journal_title": "Physical Review Letters", "authors": [ { "last_name": "Bryant", "initials": "B.", "role": "Auteur", "index_number": 1 }, { "last_name": "Spinelli", "initials": "A.", "role": "Auteur", "index_number": 2 }, { "last_name": "Wagenaar", "initials": "J. J. T.", "role": "Auteur", "index_number": 3 }, { "last_name": "Gerrits", "initials": "M.", "role": "Auteur", "index_number": 4 }, { "last_name": "Otte", "initials": "A. F.", "role": "Auteur", "index_number": 5 } ] } ] } ] }