167 citations · 322 across the 19 of their papers we have counts for
19 papers
Quantum spin dynamics in Fock space following quenches: Caustics and vortices
J. Mumford, E. Turner, D. W. L. Sprung +1
Caustics occur widely in dynamics and take on shapes classified by catastrophe theory. At finite wavelengths they produce interference patterns containing networks of vortices (pha…
1D Photonic Crystals with a Sawtooth Refractive Index
G. V. Morozov, D. W. L. Sprung, J. Martorell
Exact analytical results (in terms of Bessel functions) for the bandgaps, reflectance, and transmittance of one-dimensional photonic crystals with a sawtooth refractive index profi…
Memory effects induced by initial switching conditions
J. Martorell, D. W. L. Sprung, W. van Dijk +1
Initial-switching refers to the way in which the decay of an initially confined state begins, as the barrier isolating it from the exterior is relaxed. We study these effects in th…
Electron transmission and phase time in semiconductor superlattices
D. W. L. Sprung, W. van Dijk, C. N. Veenstra +1
We discuss the time spent by an electron propagating through a finite periodic system such as a semiconductor superlattice. The relation between dwell-time and phase-time is outlin…
Resonant carrier dynamics in strongly biassed superlattices
P. Abumov, D. W. L. Sprung
We study coherent electron dynamics in a biassed undriven ideal semiconductor superlattice coupled to the continuum, near energy level anticrossings. In particular, we examine the…
Long time deviation from exponential decay: non-integral power laws
J. Martorell, J. G. Muga, D. W. L. Sprung
Quantal systems are predicted to show a change-over from exponential decay to power law decay at very long times. Although most theoretical studies predict integer power-law expone…