Dynamics of a Particle Moving in One Dimensional Lorentz Lattice Gas

• Published in: Journal of statistical physics Vol. 176; no. 5; pp. 1161 - 1171
• Main Authors: Kumar, Sameer, Mishra, Shradha
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2019; Springer; Springer Nature B.V
• Subjects: Asymptotic properties; Communications equipment; Diffusion rate; Dynamics; Mathematical and Computational Physics; Parameters; Phase diagrams; Physical Chemistry; Physics; Physics and Astronomy; Quantum Physics; Reflectors; Specific gravity; Statistical analysis; Statistical Physics and Dynamical Systems; Theoretical; Transmitters; Diffusion; Deterministic walk; Dynamics; Lorentz lattice gas; Random walk
• ISSN: 0022-4715; 1572-9613
• DOI: 10.1007/s10955-019-02337-w

We study the dynamics of a particle moving in one-dimensional Lorentz lattice-gas where particle performs mainly three different kinds of motion viz ballistic motion, diffusion and confinement. There are two different types of scatterers, viz reflector and transmitters, randomly placed in the lattice. Reflectors are such that they reverse the particle’s velocity direction and transmitters let it pass through. Scatterers also change their character with flipping probability 1 - α , once the particle interacts with a scatterer. Hence the system is defined by two sets of parameters, r , which is the initial density of reflector/transmitter and α . For α = 0 and α = 1 dynamics of the particle is purely deterministic else it is probabilistic. In the pure deterministic case dynamics of the particle is either propagation in one direction or confined between two near-by reflectors present. For the probabilistic case α ≠ 1 and ≠ 0 , although the dynamics of particle shows anomalous diffusion where dynamics is faster, slower and comparable to normal diffusion on the variation of system parameters ( α , r ) , but the asymptotic behaviour of the particle is normal diffusion. We plot the phase diagram for the asymptotic behaviour, in the plane of α and r .