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  • Publication details - IFISC
    graphs a brief overview of visibility algorithms Lacasa Lucas Luque Bartolo Chapter contribution to the collection Computer science Computer Science Research and Technology vol 3 to appear 2010 Nova Publisher 2010 Fitxers 7x10 template4 pdf 3005277 Bytes Tornar a la llista de publicacions Cerca publicacions Conté la paraula es Operador AND OR NOT Paraules adicionals Línia d investigació Totes Complex Quantum Optics Fluids Biosystems Social Outreach Cerca avançada Xerrades i

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2119 (2016-02-15)
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  • Publication details - IFISC
    embedded quantum dot coupled to two normal leads The local Rashba spin orbit interaction acting on the dot electrons leads to a spin dependent phase factor in addition to the Aharonov Bohm phase caused by the external flux Using the numerical renormalization group method we find a splitting of the Kondo resonance at the Fermi level which can be compensated by an external magnetic field To fully understand the nature of this compensation effect we perform a scaling analysis and derive an expression for the effective magnetic field The analysis is based on a tight binding model which leads to an effective Anderson model with a spin dependent density of states for the transformed lead states We find that the effective field originates from the combined effect of Rashba interaction and magnetic flux and that it contains important corrections due to electron electron interactions We show that the compensating field is an oscillatory function of both the spin orbit and the Aharonov Bohm phases Moreover the effective field never vanishes due to the particle hole symmetry breaking independently of the gate voltage DOI 10 1103 PhysRevB 81 235309 Identificador ArXiv arXiv 1004 0670 Fitxers kondo so pdf 344600 Bytes Tornar

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2117 (2016-02-15)
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  • Publication details - IFISC
    dimensional Lotka Volterra systems restricted to an invariant and bounded region We conclude that the behaviour of the flow in the interior of this region is very simple either every orbit is a periodic orbit or they move from one boundary to another We also characterise some of the bifurcations taking place at the boundary of the invariant region DOI 10 1080 14689360903575196 Fitxers DSIJ pdf 241266 Bytes Tornar a

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=1998 (2016-02-15)
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  • Publication details - IFISC
    in Oceanic and Atmospheric Flows contains selected contributions from attendants to the workshop which in the above spirit was held in Castro Urdiales Spain in July 2008 Here we summarize the Special Issue contributions which include papers on the characterization of ocean transport in the Lagrangian and in the Eulerian frameworks generation and variability of jets and waves interactions of fluid flow with plankton dynamics or heavy drops scaling in

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2118 (2016-02-15)
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  • Publication details - IFISC
    that a quantum phase transition occurs when the coupling between spins and bosons reaches a critical value which corresponds to a level crossing in the energy spectrum Once the critical point is reached the number of bosonic excitations in the ground state which can be assumed as an order parameter starts to be different from zero The population of the bosonic mode is accompanied by a macroscopic magnetization of the

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2073 (2016-02-15)
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  • Publication details - IFISC
    eld A wealth of spatial patterns has been found e g in broad area lasers or in cells lled with sodium vapor Most of these spatio temporal phenomena encountered in optical systems can also be observed in a variety of other disciplines such as hydrodynamics electrical discharges chemical and biological systems etc because they essentially share the same mathematical formalism referring to universal concepts In this work we address both temporal and spatial dynamics in optical systems employing tools from bifurcation theory nonlinear dynamics and stochastic processes In the first part as an example of purely temporal dynamics we study the dynamical behavior of semiconductor ring lasers recently recognized to be promising sources in photonic integrated circuits In particular the bistability between the two counter propagating modes allows to encode digital information in the emission direction of ring lasers For such applications an understanding of the nonlinear dynamical behaviour is essential Studying the underlying phase space structure in combination with deter ministic and stochastic processes leads us to an improved understanding of the bistable in fact multistable regime and of the switching behavior and excitable behavior of semiconductor ring lasers Our theoretical predictions have been successfully compared to experimental results

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2111 (2016-02-15)
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  • Publication details - IFISC
    of noise on excitable DS found on nonlinear Kerr cavities showing that the system exhibits coherence resonance characterized by a maximum degree of regularity for intermediate noise intensities This behavior is observed for two different ways of applying noise an additive white uncorrelated spatio temporal noise and including fluctuations in the intensity of an addressing beam DOI 10 1140 epjd e2010 00118 4 Fitxers d09592 pdf 809557 Bytes Tornar a

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2044 (2016-02-15)
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  • Publication details - IFISC
    the interferometer when a quantum dot is inserted in one of its arms can be a continuous function of the bias voltage Such magnetoasymmetries have been investigated in related mesoscopic systems and arise as a consequence of the asymetric response of the internal potential of the conductor out of equilibrium Here we discuss magnetoasymmetries in quantum dot Aharonov Bohm interferometers when strong electron electron interactions are taken into account beyond the mean field approach We find that at very low temperatures the asymmetric element of the differential conductance shows an abrupt change for voltages around the Fermi level At higher temperatures we recover a smooth variation of the magnetoasymmetry as a function of the bias We illustrate our results with the aid of the electron occupation at the dot demonstrating that its nonequilibrium component is an asymmetric function of the flux even to lowest order in voltage We also calculate the magnetoasymmetry of the current current correlations the noise and find that it is given to a good extent by the magnetoasymmetry of the weakly nonlinear conductance term Therefore both magnetoasymmetries noise and conductance are related to each other via a higher order fluctuation dissipation relation This result appears to

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2109 (2016-02-15)
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