Two-period magneto-oscillations in coherent double barrier-resonant tunnelling

Applying a magnetic field B to a double-barrier resonant-tunnelling diode, perpendicular to the layer structure, introduces oscillations in current density and capacitance that are periodic in 1/B. A derivation of this periodicity is given, based on coherent wave propagation. Two magneto-periods are found, corresponding to the electron concentration in emitter and well, respectively. Numerical calculations are presented for a semiconductor model with self-consistently determined electron potential

Fast pulsing and chaotic itinerancy with a drift in the coherence collapse of semiconductor lasers.

We report the first experimental observation of irregular picosecond light pulses within the coherence collapse of a semiconductor laser subject to delayed moderate optical feedback. This pulsing behavior agrees with the recent explanation of Low Frequency Fluctuations as chaotic itinerancy with a drift. Theory and experiments show very good agreement. PACS numbers: 42.50.Ne, 42.55.Px, 05.45.+b Typeset using REVT E X Delayed feedback-induced instabilities have been studied since the late 70's in various dynamical systems. Besides these very early interests they are nowadays of particular interest because of their intrinsic high dimensionality and, related to that, their rich variety of dynamical phenomena [1]. Optical systems have played an important role for these investigations, and have boosted the interest in high dimensional nonlinear dynamics. [2--4]. A very popular delay system is the semiconductor laser subject to external optical feedback, because of its high sensitivity to ..

Theory of a multimode semiconductor laser with optical feedback

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