Controlling and enhancing THz collective electron dynamics in superlattices by chaos-assisted miniband transport

Details Controlling and enhancing THz collective electron dynamics in superlattices by chaos-assisted miniband transport Controlling and enhancing THz collective electron dynamics in superlattices by chaos-assisted miniband transport

2009-05-22

arxiv.org/abs/0905.3717v2

Phys. Rev. B 80, 205318 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.80.205318

We show that a tilted magnetic field transforms the structure and THz dynamics of charge domains in a biased semiconductor superlattice. At critical field values, strong coupling between the Bloch and cyclotron motion of a miniband electron triggers chaotic delocalization of the electron orbits, causing strong resonant enhancement of their drift velocity. This dramatically affects the collective electron behavior by inducing multiple propagating charge domains and GHz-THz current oscillations with frequencies ten times higher than with no tilted field.

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