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In this paper, we overview the recent results in this fascinating field of research. In particular we discuss the recently observed interference effects in partially ordered systems, including the transport of optical pulses in Fibonacci quasi-crystals and the optical analogue of Bloch oscillations. We also discuss the various cases of random lasing and show how diffusive feedback can lead to spectrally...
This study demonstrates that Bloch oscillators have an essentially different nature from that of semi-classical charged harmonic oscillators and that it is indeed possible to extract a net gain from Bloch oscillations in semiconductor superlattices. By free-space THz electro-optic sampling method, this work has directly determined the spectral shape of the complex conductivities of Bloch oscillating...
In BECs, collisions between condensate atoms give rise to a nonlinear contribution to the dynamics which is typically included as a mean-field term in the Schrodinger equation. This nonlinearity leads to a modification of well-known effects associated with matter waves in periodic potentials and adds a number of phenomena that are absent in the linear problem. We focused on the dynamics of a BEC in...
Summary form only given. We consider the semiclassical orbits of cold atoms in an optical lattice with a magnetically-induced harmonic trap. When the laser beams are aligned with a principal axis of the trap, the atoms follow regular classical paths. But when the laser beams are tilted at an angle to the axis, the atoms undergo a controllable transition from regular motion to strong classical chaos...
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