Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-09-16
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Submitted to PRB - 14 figure files - REVTEX text
Scientific paper
10.1103/PhysRevB.59.2824
We analyze the dynamics of a charged particle moving in the presence of spatially-modulated magnetic fields. From Poincare surfaces of section and Liapunov exponents for characteristic trajectories we find that the fraction of pinned and runaway quasiperiodic orbits {\em vs}. chaotic orbits depends strongly on the ratio of cyclotron radius to the structure parameters, as well as on the amplitude of the modulated field. We present a complete characterization of the dynamical behavior of such structures, and investigate the contribution to the magnetoconductivity from all different orbits using a classical Kubo formula. Although the DC conductivity of the system depends strongly on the pinned and runaway trajectories, the frequency response reflects the topology of all different orbits, and even their unusual temporal behavior.
Badran Esmael
Ulloa Sergio E.
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