Bifurcation analysis and phase diagram of a spin-string model with buckled states

We analyze a one-dimensional spin-string model, in which string oscillators are linearly coupled to their two nearest neighbors and to Ising spins representing internal degrees of freedom. String-spin coupling induces a long-range ferromagnetic interaction among spins that competes with a spin-spin antiferromagnetic coupling. As a consequence, the complex phase diagram of the system exhibits different flat rippled and buckled states, with first or second order transition lines between states. The two-dimensional version of the model has a similar phase diagram, which has been recently used to explain the rippled to buckled transition observed in scanning tunnelling microscopy experiments with suspended graphene sheets. Here we describe in detail the phase diagram of the simpler one-dimensional model and phase stability using bifurcation theory. This gives additional insight into the physical mechanisms underlying the different phases and the behavior observed in experiments.Comment: 15 pages, 7 figure

Genetic structure of the Marseilles cat population: is there really a strong founder effect?

International audienc

Reinventing a municipality by creating a festival of light. Case study, Loulé

Festivals of light are beginning to stand out, in the Portuguese scenario, as the new formula capable of responding to the needs of territorial reactivation, cultural and tourism promotion and internationalization. The artistic-cultural festivalization of the territory, outside the large nuclei, has specific characteristics to be reviewed in this study. In 2017 appears in Loulé the festival of light Luza. This cultural program is born with a multiple intention: on the one hand, to contribute to the internationalization of the council; introduce the municipality within cultural tourism circuits, with special interest in the low tourism season (winter); fight against the (pre) concept of the Algarve as a destination of sun and beach; strengthen the night economy; favor local artistic creation, and become a springboard for novice artists who intend to enter to the light art market. This project was supported by Algarve 365 and the Loulé City Council, corresponding to the main lines of intervention proposed by these entities: territory, identity, culture and tourism. In this case study, we will deepen the conditions that allowed for the development of this festival, reviewing the different public policies that participated in its implementation and the final design of the event. We will present the results of the ethnographic work developed with the different actors involved, as well as a study on the reception of Luza by visitors and residents of the city.info:eu-repo/semantics/publishedVersio

Symmetry breaking and clustering in a vibrated granular gas with several macroscopically connected compartments

The spontaneous symmetry breaking in a vibro-fluidized low-density granular gas in three connected compartments is investigated. When the total number of particles in the system becomes large enough, particles distribute themselves unequally among the three compartments. Particles tend to concentrate in one of the compartments, the other two having the (relatively small) same average number of particles. A hydrodynamical model that accurately predicts the bifurcation diagram of the system is presented. The theory can be easily extended to the case of an arbitrary number of connected compartments

Spectroscopic Signatures of Electronic Excitations in Raman Scattering in Thin Films of Rhombohedral Graphite

Rhombohedral graphite features peculiar electronic properties, including persistence of low-energy surface bands of a topological nature. Here, we study the contribution of electron-hole excitations towards inelastic light scattering in thin films of rhombohedral graphite. We show that, in contrast to the featureless electron-hole contribution towards Raman spectrum of graphitic films with Bernal stacking, the inelastic light scattering accompanied by electron-hole excitations in crystals with rhombohedral stacking produces distinct features in the Raman signal which can be used both to identify the stacking and to determine the number of layers in the film.Comment: 15 pages in preprint format, 4 figures, accepted versio