2005/01/23 by T. Feil, Thomas Feil, H.-P. Tranitz +7
Physics and Astronomy · #FOS: Physical sciences #Other Condensed Matter (cond-mat.other) #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.other
paper · pdf · doi:10.48550/arxiv.cond-mat/0501550
4 pages, 4 figures
arxiv created 2005/01/23 · openalex publication_date 2005/01/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The fundamental condition for operating a superlattice (SL) as a Bloch oscillator is a homogeneous electric field alignment under large applied bias. This can be done by combining the nonlinear miniband transport channel with a parallel shunt channel, connected through lateral transport. We report here about the first realization of such a SL-shunt system. With the cleaved-edge-overgrowth (CEO) method we combine an undoped superlattice, which acts as the shunt, with a two-dimensional (2D) cleaved-edge surface superlattice channel. Our results confirm the long predicted current-voltage-characteristic (I-V) of a SL in a homogeneous DC electric field. Excitation experiments in the GHz regime show that our shunt approach also works in the presence of an external AC electric field.