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for more information on these topics contact: R.Torre ; torre@lens.unfi.it
THz investigation of Potential Qubits, Phonons and Spin Dynamics
THz investigation of Potential Qubits, Phonons and Spin Dynamics
The investigation of the magnetization dynamics of a vanadyl complex in both solid-state and frozen solution, showed an anomalous and unprecedentedly observed field dependence of the relaxation time. The temperature dependence of the weight of the processes was found to well correlate with the low energy vibrations as determined by THz spectroscopy. This detailed experimental comparative study represents a fundamental step to understand the spin dynamics of potential molecular quantum bits, and enriches the guidelines to design molecule-based systems with enhanced quantum coherence.
Spin Dynamics and Low Energy Vibrations: Insights from Vanadyl-Based Potential Molecular QubitsM. Atzori, L. Tesi, S. Benci, A. Lunghi, R. Righini, A. Taschin, Renato Torre, L. Sorace, and R. Sessoli. J. Am. Chem. Soc. 139 (2017) 4338−4341.
Structural Effects on the Spin Dynamics of Potential Molecular Qubits M. Atzori, S. Benci, E.Morra, L. Tesi, M.Chiesa, Renato Torre, L. Sorace, and R. Sessoli. Inorg. Chem. 57 (2018) 731−740
Scaling Up Electronic Spin Qubits into a Three-Dimensional Metal−Organic FrameworkT. Yamabayashi, M. Atzori, L.Tesi, G. Cosquer, F. Santanni, M.-E. Boulon, E. Morra, S. Benci, Renato Torre, M. Chiesa, L. Sorace, R. Sessoli, and M. Yamashita. J. Am. Chem. Soc. 140 (2018) 12090
Time-domain THz spectroscopy
Time-domain THz spectroscopy
Plazanet M, Tasseva J, Bartolini P, Taschin A, Torre R, Combes C, et al.
PLoS ONE 13 (2018) e0201745.
New investigation techniques are constantly required to better characterize bone ultrastructure, we provide an extended investigation of the vibrational features of bone tissue in the 0.1-3 THz frequency range by time-domain THz spectroscopy supported by a combination of X-ray diffraction and DFT-normal modes calculations. In particular, we investigate the effect of heating on bone tissue and synthetic calciumphosphates compounds with close structure and composition to bone mineral. We thus demonstrate that the narrow vibrational mode at 2.1 THz in bone samples exposed to thermal treatment from a lattice mode of stoichiometric hydroxyapatite. The THz spectral range therefore provides a clear signature of the crystalline state of the investigated bone tissue and could, therefore be used to monitor or identify structural transitions occurring in bone upon heating.Time-domain THz spect. of the characteristics of hydroxyapatite provides a signature of heating in bone
THz radiation and artwork investigations
THz radiation and artwork investigations
THz time-domain spectroscopic investigations of thin films. Taschin, A.; Bartolini, P.; Tasseva, J.; Torre, R. Measurement, 118 (2018), 282-288,
Drawing materials studied by THz spectroscopy. A. Taschin; P.Bartolini; J. Tasseva; J. Striova; R. Fontana; C. Riminesi; Renato Torre. Acta Imeko, 6 (2017) 12-17
Thin layered drawing media probed by THz time-domain spectroscopy J. Tasseva, A. Taschin, P. Bartolini, J. Striova, R. Fontana, R. Torre. Analyst 142 (2017) 42-47
THz pulse imaging and spectroscopy is an emerging non-invasive method for the characterization of cultural heritage artefacts that provides complementary information to traditional analytical tools.We explored artworks drawing materials with THz-Time Domain Spectroscopy (THz-TDS) extending the investigation to thin layers of inks, that was never realized previously. We developed a new speci.c experimental method and data analysis to disentangle the multiple reflection signals. Thanks to a high signal to noise ratio and the accurate analysis implemented, our measurements enable the calculation of the absolute absorption coefficient and index of refraction of the materials, as well as the sample thickness down to tens of microns both in single layer and bilayer configurations.
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