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A write time of 6ns for quantum dot–based memory structures

Geller, Martin; Marent, A.; Nowozin, Tobias; Bimberg, Dieter; Akçay, N.; Öncan, N.

Inst. Festkörperphysik

The concept of a memory device based on self-organized quantum dots (QDs) is presented, enabling extremely fast write times, limited only by the charge carrier relaxation time being in the picosecond range. For a first device structure with embedded InAs∕GaAs QDs, a write time of 6ns is demonstrated. A similar structure containing GaSb∕GaAs QDs shows a write time of 14ns. These write times are independent of the localization energy (e.g., storage time) of the charge carriers and at the moment are limited only by the experimental setup and the parasitic cutoff frequency of the 𝑅𝐶 low pass of the device.
  • 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. 92, 092108 (2008) and may be found at https://doi.org/10.1063/1.2890731.