Cebollín (Allium schoenoprasum L.)

M., Jesús Alberto Villamil; Reyes, Patricia; Correa, Carmen Rosa Bonilla

doi:10.21930/978-958-719-666-5

Cited by 3 publications

(4 citation statements)

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“…We ensure f (Γ, t) to be the exact marginal distribution of the particle by assuming σ P (l) (Γ, σ, t) = 0, ∀l ≥ 1. It is the dynamical equation of f (x, p, t)-and not f itselfthat is expanded in powers of ε in the Chapman-Enskog method [27][28][29][30][31]…”

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confidence: 99%

Derivation of a Langevin equation in a system with multiple scales: The case of negative temperatures

et al. 2019

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We consider the problem of building a continuous stochastic model, i.e. a Langevin or Fokker-Planck equation, through a well-controlled coarse-graining procedure. Such a method usually involves the elimination of the fast degrees of freedom of the "bath" to which the particle is coupled. Specifically, we look into the general case where the bath may be at negative temperatures, as foundfor instance-in models and experiments with bounded effective kinetic energy. Here, we generalise previous studies by considering the case in which the coarse-graining leads to (i) a renormalisation of the potential felt by the particle, and (ii) spatially dependent viscosity and diffusivity. In addition, a particular relevant example is provided, where the bath is a spin system and a sort of phase transition takes place when going from positive to negative temperatures. A Chapman-Enskog-like expansion allows us to rigorously derive the Fokker-Planck equation from the microscopic dynamics. Our theoretical predictions show an excellent agreement with numerical simulations.

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confidence: 99%

Derivation of a Langevin equation in a system with multiple scales: The case of negative temperatures

et al. 2019

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“…, N − 1, provided that scattering-induced broadening of energy levels is much smaller than subband energies and chemical potentials; see Appendix A of Ref. 25 . The spindependent "forward tunneling velocity", v (f )± , is a sum of Lorentzians of width 2γ, with γ =h/τ scatt (the same value for all subbands, for simplicity), centered at the resonant field…”

Section: Modelmentioning

confidence: 99%

“…where T i is proportional to the transmission coefficient of the ith barrier 25 . For electrons with spin ±1/2, the chemical potential µ ± i and the electron densities n ± i are related by…”

Section: Modelmentioning

confidence: 99%

Magnetoswitching of current oscillations in dilute magnetic semiconductor nanostructures

et al. 2009

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Strongly nonlinear transport through dilute magnetic semiconductor multiquantum wells occurs due to the interplay between confinement, Coulomb, and exchange interaction. Nonlinear effects include the appearance of spin-polarized stationary states and self-sustained current oscillations as possible stable states of the nanostructure, depending on its configuration and control parameters such as voltage bias and level splitting due to an external magnetic field. Oscillatory regions grow in size with well number and level splitting. A systematic analysis of the charge and spin response to voltage and magnetic field switching of II-VI dilute magnetic semiconductor multiquantum wells is carried out. The description of stationary and time-periodic spinpolarized states, the transitions between them and the responses to voltage or magnetic field switching have great importance due to the potential implementation of spintronic devices based on these nanostructures.

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“…The situation is similar regarding the case of the kinetic Ising model as well. Among the exceptions are the study of the dynamical response of a two-dimensional Ising model subject to a square-wave external field [13], and the study of a harmonic oscillator linearly coupled with a linear chain of Ising spins [14,15].…”

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confidence: 99%

Externally driven one-dimensional Ising model

Aghamohammadi

Khorrami

2012

J. Stat. Mech.

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A one dimensional kinetic Ising model at a finite temperature on a semiinfinite lattice with time varying boundary spins is considered. Exact expressions for the expectation values of the spin at each site are obtained, in terms of the time dependent boundary condition and the initial conditions. The solution consists of a transient part which is due to the initial condition, and a part driven by the boundary. The latter is an evanescent wave when the boundary spin is oscillating harmonically. Low-and high-frequency limits are investigated with greater detail. The total magnetization of the lattice is also obtained. It is seen that for any arbitrary rapidly varying boundary conditions, this total magnetization is equal to the the boundary spin itself, plus essentially the time integral of the boundary spin. A nonuniform model is also investigated. 1

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Cebollín (Allium schoenoprasum L.)

Cited by 3 publications

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Derivation of a Langevin equation in a system with multiple scales: The case of negative temperatures

Derivation of a Langevin equation in a system with multiple scales: The case of negative temperatures

Magnetoswitching of current oscillations in dilute magnetic semiconductor nanostructures

Externally driven one-dimensional Ising model

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