ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We report a study of the current-voltage characteristics of a double barrier, lattice matched, quantum well tunneling structure in a quantizing magnetic field (B(parallel)J). Experiments were conducted at fields up to 23 T at 1.5 K. The heterostructure investigated had 400 A(ring) spacer layers in the emitter and collector, a barrier width of 72 A(ring), and a 43-A(ring)-wide quantum well. This structure showed one negative differential resistance region with a peak-to-valley ratio of 23 at 4.2 K. We observed magnetoquantum oscillations, periodic in 1/B, associated with tunneling from a quantized state in the emitter. The overall magnetoconductance dramatically changed with applied bias. We associated these variations with a field-induced increase of the impedance of the undoped spacer layers. The frequency of these oscillations increased linearly with applied bias. A discontinuity in this dependence is observed around the peak bias voltage which is the direct result of the dynamical storage and release of charge in the well.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.101238
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