Phys. Rev. B 80, 205318 (2009) [5 pages]Controlling and enhancing terahertz collective electron dynamics in superlattices by chaos-assisted miniband transportReceived 16 October 2009; published 18 November 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.205318
DOI:
10.1103/PhysRevB.80.205318
PACS:
73.21.−b, 05.45.Mt, 72.20.Ht, 72.30.+q
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