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3 ns single-shot read-out in a quantum dot-based memory structure

Nowozin, T.; Beckel, A.; Bimberg, Dieter; Lorke, A.; Geller, Martin

Fast read-out of two to six charges per dot from the ground and first excited state in a quantum dot (QD)-based memory is demonstrated using a two-dimensional electron gas. Single-shot measurements on modulation-doped field-effect transistor structures with embedded InAs/GaAs QDs show read-out times as short as 3 ns. At low temperature (T = 4.2 K) this read-out time is still limited by the parasitics of the setup and the device structure. Faster read-out times and a larger read-out signal are expected for an improved setup and device structure.
Published in: Applied Physics Letters, 10.1063/1.4864281, American Institute of Physics (AIP)
  • This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 104, 053111 (2014) and may be found at https://doi.org/10.1063/1.4864281.