Laser-driven nonlinear cluster dynamics

Laser-driven nonlinear cluster dynamics: from single- and multiphoton excitations to the strong-field domain

Laser excitation of nanometer-sized atomic and molecular clusters offers insight into complex many-particle dynamics from several perspectives. Whereas weak laser fields allow the analysis of photoionization, excited-state relaxation, and structural modifications on these finite quantum systems, violent collective electron motion and Coulomb explosion can be explored with intense laser pulses. ...

Laser-driven nonadiabatic electron dynamics in molecules

In this review, we briefly summarize more than a decade of experimental and theoretical investigations regarding the nonadiabatic electron response to intense femtosecond duration laser fields in a variety of molecular systems. Historically, experimental signatures of nonadiabaticity have emerged readily in large, conjugated, or multi-electron systems, disrupting fragmentation behavior and modu...

Data driven discovery of nonlinear dynamics

We demonstrate that sparse regression and compressive sensing techniques are capable of accurately determining a set of functions governing a nonlinear dynamical system. We analyze a technique introduced by Brunton, Proctor, and Kutz, 2016 [1] that builds a sparse representation of a dynamical system by computing sequential least squares fittings of the data to identify the governing equations....

Quantitative theory of driven nonlinear brain dynamics

Strong periodic stimuli such as bright flashing lights evoke nonlinear responses in the brain and interact nonlinearly with ongoing cortical activity, but the underlying mechanisms for these phenomena are poorly understood at present. The dominant features of these experimentally observed dynamics are reproduced by the dynamics of a quantitative neural field model subject to periodic drive. Mod...

Nonlinear plasma waves resonantly driven by optimized laser pulse trains.