C. Chandré
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View article: Transition to superdiffusive transport in turbulent plasmas
Transition to superdiffusive transport in turbulent plasmas Open
We investigate the motion of charged particles in a turbulent electrostatic potential using guiding-center theory. By increasing the Larmor radius, the dynamics exhibit close-to-ballistic transport properties. The transition from diffusive…
View article: Transition to super-diffusive transport in turbulent plasmas
Transition to super-diffusive transport in turbulent plasmas Open
We investigate the motion of charged particles in a turbulent electrostatic potential using guiding-center theory. By increasing the Larmor radius, the dynamics exhibit close-to-ballistic transport properties. The transition from diffusive…
View article: Nonlinear dynamics of molecular superrotors
Nonlinear dynamics of molecular superrotors Open
We consider a diatomic molecule driven by a linearly polarized laser pulse\nwith a polarization axis rotating with a constant acceleration. This setup is\nreferred to as optical centrifuge, and it is known to lead to high-angular\nmomenta …
View article: Classical Nambu brackets in higher dimensions
Classical Nambu brackets in higher dimensions Open
We consider n-linear Nambu brackets in dimension N higher than n. Starting from a Hamiltonian system with a Poisson bracket and K Casimir invariants defined in the phase space of dimension N = K + 2M, where M is the number of effective deg…
View article: Nonlinear dynamics of molecular superrotors
Nonlinear dynamics of molecular superrotors Open
We consider a diatomic molecule driven by a linearly polarized laser pulse with a polarization axis rotating with a constant acceleration. This setup is referred to as optical centrifuge, and it is known to lead to high-angular momenta for…
View article: Numerical Computation of Critical Surfaces for the Breakup of Invariant Tori in Hamiltonian Systems
Numerical Computation of Critical Surfaces for the Breakup of Invariant Tori in Hamiltonian Systems Open
We compute the critical surface for the existence of invariant tori of a\nfamily of Hamiltonian systems with two and three degrees of freedom. We use and\ncompare two methods to compute the critical surfaces: renormalization-group\ntransfo…
View article: Human septins organize as octamer-based filaments and mediate actin-membrane anchoring in cells
Human septins organize as octamer-based filaments and mediate actin-membrane anchoring in cells Open
Septins are cytoskeletal proteins conserved from algae and protists to mammals. A unique feature of septins is their presence as heteromeric complexes that polymerize into filaments in solution and on lipid membranes. Although animal septi…
View article: Four-field Hamiltonian fluid closures of the one-dimensional Vlasov–Poisson equation
Four-field Hamiltonian fluid closures of the one-dimensional Vlasov–Poisson equation Open
We consider a reduced dynamics for the first four fluid moments of the one-dimensional Vlasov–Poisson equation, namely, fluid density, fluid velocity, pressure, and heat flux. This dynamics depends on an equation of state to close the syst…
View article: Four-field Hamiltonian fluid closures of the one-dimensional Vlasov-Poisson equation
Four-field Hamiltonian fluid closures of the one-dimensional Vlasov-Poisson equation Open
We consider a reduced dynamics for the first four fluid moments of the onedimensional Vlasov-Poisson equation, namely, the fluid density, fluid velocity, pressure and heat flux. This dynamics depends on an equation of state to close the sy…
View article: Human septins in cells organize as octamer-based filaments mediating actin-membrane anchoring
Human septins in cells organize as octamer-based filaments mediating actin-membrane anchoring Open
Septins are cytoskeletal proteins conserved from algae and protists to mammals. Septin knock-out animals have established that septins are essential for animal physiology, but their molecular function remains elusive. A unique feature of s…
View article: Dynamical Organization of Recollisions by a Family of Invariant Tori
Dynamical Organization of Recollisions by a Family of Invariant Tori Open
We consider the motion of an electron in an atom subjected to a strong\nlinearly polarized laser field. We identify the invariant structures organizing\na very specific subset of trajectories, namely recollisions. Recollisions are\ntraject…
View article: Charge migration and attosecond solitons in conjugated organic molecules
Charge migration and attosecond solitons in conjugated organic molecules Open
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View article: Classical Nambu brackets in higher dimensions
Classical Nambu brackets in higher dimensions Open
We consider n-linear Nambu brackets in dimension N higher than n. Starting from a Hamiltonian system with a Poisson bracket and K Casimir invariants defined in the phase space of dimension N = K+2M, where M is the number of effective degre…
View article: Numerical computation of critical surfaces for the breakup of invariant tori in Hamiltonian systems
Numerical computation of critical surfaces for the breakup of invariant tori in Hamiltonian systems Open
We compute the critical surface for the existence of invariant tori of a family of Hamiltonian systems with two and three degrees of freedom. We use and compare two methods to compute the critical surfaces: renormalization-group transforma…
View article: Hamiltonian fluid reduction of the 1.5D Vlasov–Maxwell equations
Hamiltonian fluid reduction of the 1.5D Vlasov–Maxwell equations Open
We consider the Vlasov–Maxwell equations with one spatial direction and two momenta. By solving the Jacobi identity, we derive reduced Hamiltonian fluid models for the density, the fluid momenta, and the second order moments, related to th…
View article: Dynamical organization of recollisions by a family of invariant tori
Dynamical organization of recollisions by a family of invariant tori Open
We consider the motion of an electron in an atom subjected to a strong linearly polarized laser field. We identify the invariant structures organizing a very specific subset of trajectories, namely recollisions. Recollisions are trajectori…
View article: Nonadiabatic effects in the double ionization of atoms driven by a circularly polarized laser pulse
Nonadiabatic effects in the double ionization of atoms driven by a circularly polarized laser pulse Open
We study the double ionization of atoms subjected to circularly polarized (CP) laser pulses. We analyze two fundamental ionization processes: the sequential (SDI) and nonsequential (NSDI) double ionization in the light of the rotating fram…
View article: Envelope-Driven Recollisions Triggered by an Elliptically Polarized Pulse
Envelope-Driven Recollisions Triggered by an Elliptically Polarized Pulse Open
Increasing ellipticity usually suppresses the recollision probability drastically. In contrast, we report on a recollision channel with large return energy and a substantial probability, regardless of the ellipticity. The laser envelope pl…
View article: Charge Migration Manifests as Attosecond Solitons in Conjugated Organic\n Molecules
Charge Migration Manifests as Attosecond Solitons in Conjugated Organic\n Molecules Open
Charge migration is the electronic response that immediately follows\nlocalized ionization or excitation in a molecule, before the nuclei have time\nto move. It typically unfolds on sub-femtosecond time scales and most often\ncorresponds t…
View article: Charge Migration Manifests as Attosecond Solitons in Conjugated Organic Molecules
Charge Migration Manifests as Attosecond Solitons in Conjugated Organic Molecules Open
Charge migration is the electronic response that immediately follows localized ionization or excitation in a molecule, before the nuclei have time to move. It typically unfolds on sub-femtosecond time scales and most often corresponds to d…
View article: Double-ionization mechanisms of magnesium driven by electron impact
Double-ionization mechanisms of magnesium driven by electron impact Open
We study double ionization of Mg by electron impact through the vantage point\nof classical mechanics. We consider all electron-electron correlations in a\nCoulomb four-body problem, where three electrons belong to the atom and the\nfourth…
View article: First principles gyrokinetic analysis of electromagnetic plasma instabilities
First principles gyrokinetic analysis of electromagnetic plasma instabilities Open
A two-fold analysis of electromagnetic core tokamak instabilities in the\nframework of the gyrokinetic theory is presented. First principle theoretical\nfoundations of the gyrokinetic theory are used to explain and justify the\nnumerical r…
View article: High harmonic generation with nearly circular polarized pulses
High harmonic generation with nearly circular polarized pulses Open
According to conventional wisdom, increasing ellipticity reduces high harmonic generation by several orders because the recollision probability decreases. This is the obvious conclusion drawn from the motion of an electron in a laser field…