Spatially confined Bloch oscillations in semiconductor superlattices
Gregorio Millán Institute for Fluid Dynamics, Nanoscience and Industrial Mathematics, Universidad Carlos III de Madrid - Avenida de la Universidad 30, 28911 Leganés, Spain, EU
Accepted: 27 June 2011
In a semiconductor superlattice with long scattering times, damping of Bloch oscillations due to scattering is so small that convective nonlinearities may compensate it and Bloch oscillations persist even in the hydrodynamic regime. In this case, numerical solutions show that there are stable Bloch oscillations confined to a region near the collector with inhomogeneous field, charge, current density and energy density profiles. These Bloch oscillations disappear when damping due to inelastic collisions becomes sufficiently strong.
PACS: 72.20.Ht – High-field and nonlinear effects / 73.63.-b – Electronic transport in nanoscale materials and structures / 05.45.-a – Nonlinear dynamics and chaos
© EPLA, 2011