Photocreation of a dark electron-hole pair in a quantum dot
- URL: http://arxiv.org/abs/2004.00573v1
- Date: Wed, 1 Apr 2020 17:02:42 GMT
- Title: Photocreation of a dark electron-hole pair in a quantum dot
- Authors: Shiue-Yuan Shiau, Benoit Eble, Valia Voliotis, Monique Combescot
- Abstract summary: Photon absorption in a semiconductor produces bright excitons that recombine very fast into photons.
We show that in a quantum dot set close to a p-doped reservoir, this absorption can produce a dark duo, i.e., an electron-hole pair that does not emit light.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Photon absorption in a semiconductor produces bright excitons that recombine
very fast into photons. We here show that in a quantum dot set close to a
p-doped reservoir, this absorption can produce a dark duo, i.e., an
electron-hole pair that does not emit light. This unexpected effect relies on
the fact that the wave function for a hole leaks out of a finite-barrier dot
less than for electron. This difference can render the positively charged trio
unstable in the dot by tuning the applied bias voltage in a field-effect
device. The unstable trio that would result from photon absorption in a
positively charged dot, has to eject one of its two holes. The remaining duo
can be made dark with a probability close to 100% after a few pumping cycles
with linearly polarized photons, in this way engineering long-lived initial
states for quantum information processing.
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