Institutes for complex systems (ISC)

Focus

SPIKY

2016
SPIKY (Kreuz et al., 2015) is a graphical user interface written in Matlab which facilitates the analysis of electrophysiological data such as the EEG and neuronal spike trains (sequences of electrical action potentials emitted by neurons). In addition to the standard Peri-Stimulus Time Histogram (PSTH) it contains several time-resolved measures of spike train synchrony which were all developed in our lab: ISI-distance, SPIKE-distance, and SPIKE synchronization. For a given data set SPIKY ...

Diffusion, what else?

2016
Diffusion essentially refers to a motion which leads to the spreading of some quantity: density of particles, energy, and so on. It owes its universality to the central limit theorem, according to which che combination of independent, random events has general features not related to the details of the single events. For example, in a standard, diffusive motion the spreading quantity does not vary proportionally to the time, but its variation may double only if time quadruples! If however the ...

Rotation of the polarization and easy shear cooperate to boost the piezoelectric effect

2016
Ferroelectrics are materials exhibiting spontaneous polarization and strain below the Curie temperature, so that the application of an electric field produces a deformation and the application of a stress produces an electric field, the so-called piezoelectric effect. For sensor and actuators it is desired that the magnitude of the piezoelectric effect is maximized, and this is often the case near transitions between ferroelectric phases whose spontaneous polarizations are in different ...

Physical realization of the Glauber quantum oscillator

2016
More than 30 years ago, Glauber theorized the existence of quantum systems to explain the link between the reversible microscopic and irreversible macroscopic scale. The formulation of such model is based on the so-called "rigged Hilbert space" and include irreversibility as a fundamental principle through the introduction of an inverted harmonic oscillator describing quantum amplifier. The standard quantum mechanics does not forbid time-travel. However, according to the Glauber theory a quantum ...

The classical and quantum dynamics of molecular spins grafted on graphene

2015
The effect of graphene phonons and electrons on the spin dynamics of molecules grafted on graphene was investigated in a paper published in Nature Materials (C.Cervetti, A.Rettori, M.G.Pini, A.Cornia, A.Repollés, F.Luis, M.Dressel, S.Rauschenbach, M.Burghard, and L.Bogani). Dirac electrons introduce dominant quantum-relaxation channels and allow reaching a quantum tunneling regime, that was predicted 20 years ago by the French physicist Jacques Villain. A novel theoretical background is ...

Tech4Bio

2015
From 2013 ISC coordinates the interistitute working group Tech4Bio, which consists of CNR researchers with different expertise but a common aim of favoring the formation of a scientific network contacting many different and complementary experiences, knowledge and technology, to explore the possibilities of scientific and technological development in the field of Biophysics, Biosensing and Biotechnology. The group presently comprises researchers from ISC, ISM, IFN, IFT, IDASC (www.tech4bio.eu). ...

Silent Flocks

2015
A paper on the collective behaviour of bird flocks, in which a spin wave model is brought to the continuous limit as in fluid elements of a large hydrodynamic system, has been published in Physical Review Letters and it has been the subject of a synopsis in the APS magazine Physics. Both spin and density waves can propagate throughout flocks, but in some cases their contributions are quickly damped. Andrea Cavagna's group at ISC has shown that only spin waves propagate in medium-to-small ...

The Italian Neutron Experimental Station INES@ISIS

2008
INES is the Italian Neutron Experimental Station at ISIS, the world most powerful pulsed neutron source, at Rutherford Appleton Laboratory (U.K.). The experimental station is equipped with a time-of-flight neutron diffractometer and is mainly used for the microscopic structural analysis of materials of archaelogical interest. Since first installation, on January 2006, this instrument has been made available to the Italian and international scientific communities. During 2006, 28 experiments have ...

CVD diamond electronic devices and detectors.

2007
This research group at ISC, Montelibretti (Rome) has been working since early 90s to the design and development of CVD diamond devices and dosimeters. In the frame of FP5 the group led the " Material Engineering of CVD diamond: defect tailoring for optimised tissue equivalent linear radiotherapy dosimetry and other passive electronic applications", Project. It was aimed at producing prototypes of dosimeters suitable to work under clinical conditions for radiotherapy, with a performance ...

Diamond detector has three-electrode structure, Laser Focus World, July, 2003

2003
Not only does diamond sparkle--it withstands ionizing radiation, too. Researchers at the University of Rome Tre and CNR, Institute of Inorganic Methodology and Plasmas (both of Rome, Italy) are using the material as a basis for photodetectors that may be well-suited for astronomical use in space, where ions degrade other materials. The detector operates by collecting both photogenerated carriers in the bulk material and photoelectrons emitted from the surface. A 50-µm-thick diamond film is ...