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2006 | 109 | 1 | 43-52
Article title

Stochastic Carrier Dynamics in Semiconductor Superlattices

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EN
Abstracts
EN
We explore a new regime of hot carrier dynamics, in which electrons in a superlattice miniband exhibit a unique type of stochastic motion when a magnetic field is tilted at an angleθ to the superlattice axis. Remarkably, the dynamics of a miniband electron in a tilted magnetic field reduce to a one-dimensional simple harmonic oscillator, of angular frequencyω_C cosθ, whereω_C is the cyclotron frequency, driven by a time-dependent plane wave whose angular frequency equals the Bloch frequencyω_B. At bias voltages for whichω_B=nω_C cosθ, where n is an integer, the electron orbits change from localised Bloch-like trajectories to unbounded stochastic orbits, which diffuse rapidly through intricate web patterns in phase space. To quantify how these webs affect electron transport, we make drift-diffusion calculations of the current-voltage curves including the effects of space-charge build up. When the magnetic field is tilted, our simulations reveal a large resonant peak, which originates from stochastic delocalisation of the electron orbits. We show that the corresponding quantised eigenstates change discontinuously from a highly localised character when the system is off resonance to a fully delocalised form when the resonance condition is satisfied.
Keywords
EN
Publisher

Year
Volume
109
Issue
1
Pages
43-52
Physical description
Dates
published
2006-01
received
2005-05-19
Contributors
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
  • Instituto de Fisica, Universidad Autonoma de Puebla, Puebla 72570, Mexico
  • Center for Nonlinear Science, University of North Texas, P.O. Box 5368, Denton, Texas 762203, USA
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
author
  • School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv109n104kz
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