{ "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": "680-47-425", "title": "Simulating the Hubbard model on a quantum dot array", "funding_scheme_id": 472, "funding_scheme": "NWO-Talentprogramma Veni 2012 N", "department": "Exacte en Natuurwetenschappen", "sub_department": "Natuurkunde", "start_date": "2012-09-01T00:00:00", "end_date": "2015-06-08T00:00:00", "reporting_year": 2012, "summary_nl": "Quantum simulations have recently emerged as a powerful method to study quantum many-body physics without the limitations of classical computations. \nThese methods are particularly interesting to study the Hubbard model, which is one of the most important for condensed matter physics as it finely describes the interplay of charges and spins in solid state materials. So far, this model has been successfully simulated with cold atoms, which allowed studying Mott Insulating phases. Unfortunately, current cooling methods do not allow accessing the most fascinating low temperature regime of the Hubbard model, where spin correlations strongly influences quantum phases provoking magnetic ordering and possibly superconductivity.\nSimulations based on electronic systems such as sets of quantum dots represent a promising alternative here: they naturally obey the Hubbard Hamiltonian and they can be cooled deep into this low temperature regime.\nI therefore propose to realize a large array of coupled quantum dots in a GaAs/AlGaAs heterostructure to simulate the Hubbard model. The density of states, a quantity of central importance to characterize the quantum phases, will be directly measured by tunneling spectroscopy. This method will not only give new insights into the strong correlations of the Mott-Hubbard regime, but will also allow simulating for the first time the pseudogap, one of most important and controversial phases of the low temperature regime. To ensure that the quantum simulations are not perturbed by disorder in the semiconductor, innovative heterostructure schemes will be used, where the influence of impurities is strongly screened by remote mobile charges.\n", "summary_en": "Quantum simulations have recently emerged as a powerful method to study quantum many-body physics without the limitations of classical computations. \nThese methods are particularly interesting to study the Hubbard model, which is one of the most important for condensed matter physics as it finely describes the interplay of charges and spins in solid state materials. So far, this model has been successfully simulated with cold atoms, which allowed studying Mott Insulating phases. Unfortunately, current cooling methods do not allow accessing the most fascinating low temperature regime of the Hubbard model, where spin correlations strongly influences quantum phases provoking magnetic ordering and possibly superconductivity.\nSimulations based on electronic systems such as sets of quantum dots represent a promising alternative here: they naturally obey the Hubbard Hamiltonian and they can be cooled deep into this low temperature regime.\nI therefore propose to realize a large array of coupled quantum dots in a GaAs/AlGaAs heterostructure to simulate the Hubbard model. The density of states, a quantity of central importance to characterize the quantum phases, will be directly measured by tunneling spectroscopy. This method will not only give new insights into the strong correlations of the Mott-Hubbard regime, but will also allow simulating for the first time the pseudogap, one of most important and controversial phases of the low temperature regime. To ensure that the quantum simulations are not perturbed by disorder in the semiconductor, innovative heterostructure schemes will be used, where the influence of impurities is strongly screened by remote mobile charges.\n", "project_members": [ { "role": "Project leader", "member_id": 247554, "last_name": "Barthelemy", "degree_pre_nominal": "dr.", "initials": "P.J.C.", "first_name": "Pierre", "organisation": "Technische Universiteit Delft||QuTech", "organisation_id": 75741, "ror": "https://ror.org/02e2c7k09", "active": false }, { "role": "Researcher", "member_id": 247554, "last_name": "Barthelemy", "degree_pre_nominal": "dr.", "initials": "P.J.C.", "first_name": "Pierre", "organisation": "Technische Universiteit Delft||QuTech", "organisation_id": 75741, "ror": "https://ror.org/02e2c7k09", "active": false }, { "role": "Main Applicant", "member_id": 247554, "last_name": "Barthelemy", "degree_pre_nominal": "dr.", "initials": "P.J.C.", "first_name": "Pierre", "organisation": "Technische Universiteit Delft||QuTech", "organisation_id": 75741, "ror": "https://ror.org/02e2c7k09", "active": true } ], "products": [ { "title": "Photon- and phonon-assisted tunneling in the three-dimensional charge stability diagram of a triple quantum dot array", "year": 2013, "edition": "102", "start": 112110, "type": "Wetenschappelijk artikel", "journal_title": "Applied Physics Letter", "authors": [ { "last_name": "Braakman", "initials": "F.", "role": "Auteur", "index_number": 1 }, { "last_name": "Barthelemy", "initials": "P.", "role": "Auteur", "index_number": 2 }, { "last_name": "Reichl", "initials": "C.", "role": "Auteur", "index_number": 3 }, { "last_name": "Wegscheider", "initials": "W.", "role": "Auteur", "index_number": 4 }, { "last_name": "Vandersypen", "initials": "L.M.K.", "role": "Auteur", "index_number": 5 } ] }, { "title": "Long-distance coherent coupling in a quantum\ndot array", "year": 2013, "edition": "8", "start": 432, "end": 437, "type": "Wetenschappelijk artikel", "journal_title": "Nature Nanotechnology", "authors": [ { "last_name": "Braakman", "initials": "F.", "role": "Auteur", "index_number": 1 }, { "last_name": "Barthelemy", "initials": "P.", "role": "Auteur", "index_number": 2 }, { "last_name": "Reichl", "initials": "C.", "role": "Auteur", "index_number": 3 }, { "last_name": "Wegscheider", "initials": "W.", "role": "Auteur", "index_number": 4 }, { "last_name": "Vandersypen", "initials": "L.M.K.", "role": "Auteur", "index_number": 5 } ] }, { "title": "Quantum Dot Systems: a versatile platform\nfor quantum simulations", "year": 2013, "edition": "525", "start": 808, "end": 826, "type": "Wetenschappelijk artikel", "journal_title": "Annalen der Physik", "authors": [ { "last_name": "Barthelemy", "initials": "P.", "role": "Auteur", "index_number": 1 }, { "last_name": "Vandersypen", "initials": "L.M.K.", "role": "Auteur", "index_number": 2 } ] } ] } ] }