Enviaments recents

  • Analysis of noise-induced temporal correlations in neuronal spike sequences 

    Reinoso, Jose A.; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (2016-11-01)
    Article
    Accés restringit per política de l'editorial
    We investigate temporal correlations in sequences of noise-induced neuronal spikes, using a symbolic method of time-series analysis. We focus on the sequence of time-intervals between consecutive spikes (inter-spike-intervals, ...
  • Transition between functional regimes in an integrate-and-fire network model of the thalamus 

    Barardi, Alessandro; García Ojalvo, Jordi; Mazzoni, Alberto (2016-09-06)
    Article
    Accés obert
    The thalamus is a key brain element in the processing of sensory information. During the sleep and awake states, this brain area is characterized by the presence of two distinct dynamical regimes: in the sleep state activity ...
  • Temporally correlated fluctuations drive epileptiform dynamics 

    Jedynak, Maciej; Pons Rivero, Antonio Javier; García Ojalvo, Jordi; Goodfellow, Marc (2017-02-01)
    Article
    Accés obert
    Macroscopic models of brain networks typically incorporate assumptions regarding the characteristics of afferent noise, which is used to represent input from distal brain regions or ongoing fluctuations in non-modelled ...
  • Quantitative identification of dynamical transitions in a semiconductor laser with optical feedback 

    Quintero Quiroz, Carlos Alberto; Tiana Alsina, Jordi; Roma, Josep; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (Macmillan Publishers, 2016-11-18)
    Article
    Accés obert
    Identifying transitions to complex dynamical regimes is a fundamental open problem with many practical applications. Semi- conductor lasers with optical feedback are excellent testbeds for studying such transitions, as ...
  • Observation of azimuthal modulation instability and formation of patterns of optical solitons in a quadratic nonlinear crystal 

    Petrov, Dimitri; Torner Sabata, Lluís; Martorell Pena, Jordi; Vilaseca Alavedra, Ramon; Pérez Torres, Juan; Cojocaru, Crina (1998-09)
    Article
    Accés restringit per política de l'editorial
    We report what is believed to be the first experimental demonstration of the azimuthal self-breaking of intense beams containing a vortex phase dislocation into sets of optical spatial solitons in a quadratic nonlinear ...
  • Quantum control of population transfer and vibrational states via chirped pulses in four level density matrix equations 

    Afa, Iduabo John; Serrat Jurado, Carles (2016-11-15)
    Article
    Accés obert
    We investigate the effect of chirped excitation and the excitation detuning on the coherent control of population transfer and vibrational states in a four-­--level system. Density matrix equations are studied for optimally ...
  • Photonic Crystal Microchip Laser 

    Gailevicius, Darius; Koliadenko, Volodymyr; Purlys, Vytautas; Peckus, Martynas; Taranenko, Victor; Staliunas, Kestutis (Macmillan Publishers, 2016-09-29)
    Article
    Accés obert
    The microchip lasers, being very compact and efficient sources of coherent light, suffer from one serious drawback: low spatial quality of the beam strongly reducing the brightness of emitted radiation. Attempts to improve ...
  • Transverse single-shot cross-correlation scheme for laser pulse temporal measurement via planar second harmonic generation 

    Wang, Bingxia; Cojocaru, Crina; Krolikowski, Wieslaw; Yan Sheng, Yan Sheng; Trull Silvestre, José Francisco (2016-09-15)
    Article
    Accés restringit per política de l'editorial
    We present a novel single-shot cross-correlation technique based on the analysis of the transversally emitted second harmonic generation in crystals with random distribution and size of anti-parallel nonlinear domains. We ...
  • Core-level attosecond transient absorption spectroscopy of laser-dressed solid films of Si and Zr 

    Seres, Enikoe; Seres, Jozsef; Serrat Jurado, Carles; Namba, Shinichi (American Physical Society, 2016-10-12)
    Article
    Accés obert
    We investigated experimentally as well as theoretically the ultrafast response of the wave function of the conduction band (CB) of Si and Zr to a near-infrared laser field using extreme ultraviolet (XUV) absorption ...
  • Intrapulse x-ray parametric amplification in high-order-harmonic generation 

    Serrat Jurado, Carles (2016-06-17)
    Article
    Accés obert
    We demonstrate strong-field-driven impulsive XUV-x-ray parametric amplification (IXPA) processes in high-order harmonic generation at the single-atom level by using ab initio calculations. We consider the example of Li+ ...

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