Enhanced Molecular Spin-Photon Coupling at Superconducting Nanoconstrictions

Gimeno, Ignacio ; Kersten, Wenzel ; Pallarés, María C. (Universidad de Zaragoza) ; Hermosilla, Pablo (Universidad de Zaragoza) ; Martínez-Pérez, María José (Universidad de Zaragoza) ; Jenkins, Mark D. ; Angerer, Andreas ; Sánchez-Azqueta, Carlos (Universidad de Zaragoza) ; Zueco, David (Universidad de Zaragoza) ; Majer, Johannes ; Lostao, Anabel (Universidad de Zaragoza) ; Luis, Fernando (Universidad de Zaragoza)

Resumen: We combine top-down and bottom-up nanolithography to optimize the coupling of small molecular spin ensembles to 1.4 GHz on-chip superconducting resonators. Nanoscopic constrictions, fabricated with a focused ion beam at the central transmission line, locally concentrate the microwave magnetic field. Drops of free-radical molecules have been deposited from solution onto the circuits. For the smallest ones, the molecules were delivered at the relevant circuit areas by means of an atomic force microscope. The number of spins Neff effectively coupled to each device was accurately determined combining Scanning Electron and Atomic Force Microscopies. The collective spin-photon coupling constant has been determined for samples with Neff ranging between 2 × 106 and 1012 spins, and for temperatures down to 44 mK. The results show the well-known collective enhancement of the coupling proportional to the square root of Neff. The average coupling of individual spins is enhanced by more than 4 orders of magnitude (from 4 mHz up to above 180 Hz), when the transmission line width is reduced from 400 µm down to 42 nm, and reaches maximum values near 1 kHz for molecules located on the smallest nanoconstrictions.

Idioma: Inglés

DOI: 10.1021/acsnano.0c03167

Año: 2020

Publicado en: ACS NANO 14, 7 (2020), 8707-8715
ISSN: 1936-0851

Factor impacto JCR: 15.881 (2020)

Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 14 / 178 = 0.079 (2020) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 21 / 333 = 0.063 (2020) - Q1 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 12 / 162 = 0.074 (2020) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 11 / 106 = 0.104 (2020) - Q1 - T1

Factor impacto SCIMAGO: 5.554 - Engineering (miscellaneous) (Q1) - Physics and Astronomy (miscellaneous) (Q1) - Nanoscience and Nanotechnology (Q1) - Materials Science (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E09-17R
Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/E35-20R
Financiación: info:eu-repo/grantAgreement/ES/DGA/LMP55-18
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2017-89993-R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/RTI2018-096075-B-C21
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2017-88358-C3-1-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/PCI2018-093116
Financiación: info:eu-repo/grantAgreement/EUR/MOLSPIN-COST/CA15128

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Aplicada (Dpto. Física Aplicada)
Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)
Área (Departamento): Área Bioquímica y Biolog.Mole. (Dpto. Bioq.Biolog.Mol. Celular)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)