0000000001009767

AUTHOR

Stefano Bonetti

showing 2 related works from this author

Ultrafast amplification and non-linear magneto-elastic coupling of coherent magnon modes in an antiferromagnet

2021

We investigate the role of domain walls in the ultrafast magnon dynamics of an antiferromagnetic NiO single crystal in a pump-probe experiment with variable pump photon energy. Analysing the amplitude of the energy-dependent photo-induced ultrafast spin dynamics, we detect a yet unreported coupling between the material's characteristic THz- and a GHz-magnon modes. We explain this unexpected coupling between two orthogonal eigenstates of the corresponding Hamiltonian by modelling the magneto-elastic interaction between spins in different domains. We find that such interaction, in the non-linear regime, couples the two different magnon modes via the domain walls and it can be optically exploi…

Terahertz radiationFOS: Physical sciencesGeneral Physics and AstronomyPhysics::Optics02 engineering and technologyPhoton energy01 natural sciencesSettore FIS/03 - Fisica della MateriaCondensed Matter::Materials Sciencesymbols.namesakeMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesAntiferromagnetism010306 general physicsPhysicsCondensed matter physicsSpinsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed Matter::OtherMagnonResonance021001 nanoscience & nanotechnology3. Good healthCondensed Matter - Other Condensed MatterCoupling (physics)symbolsCondensed Matter::Strongly Correlated Electrons0210 nano-technologyHamiltonian (quantum mechanics)Other Condensed Matter (cond-mat.other)
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Absence of a day-night asymmetry in the7Be solar neutrino rate in Borexino

2012

We report on a search for the day-night asymmetry of the Be-7 solar neutrino rate measured by Borexino at the Laboratori Nazionali del Gran Sasso (LNGS), Italy. The measured value, Adn=0.001 +- 0.012 (stat) +- 0.007 (syst), shows the absence of a significant asymmetry. This result alone rejects the so-called LOW solution at more than 8.5 sigma. Combined with the other solar neutrino data, it isolates the Large Mixing Angle (LMA) -- MSW solution at DeltaChi2 > 190 without relying on the assumption of CPT symmetry in the neutrino sector. We also show that including the day-night asymmetry, data from Borexino alone restricts the MSW neutrino oscillations to the LMA solution at 90% confidence l…

Particle physicsNuclear and High Energy PhysicsNeutrino oscillationPhysics::Instrumentation and Detectorsmedia_common.quotation_subjectSolar neutrino01 natural sciencesAsymmetrySolar neutrinoNuclear physicsDay-night effect0103 physical sciences010306 general physicsNeutrino oscillationNuclear Experimentday–night effectBorexinomedia_commonPhysicsneutrino oscillations010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyFísicaSolar neutrino problemNeutrino detectorsolar neutrinosMeasurements of neutrino speedHigh Energy Physics::ExperimentNeutrinoCPT violation
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