Photoconductance quantization in a single-photon detector

Hideo Kosaka, Deepak S. Rao, Hans D. Robinson, Prabhakar Bandaru, Toshitsugu Sakamoto, Eli Yablonovitch

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


We have made a single-photon detector that relies on photoconductive gain in a narrow electron channel in an AlyGa1-yAs/GaAs two-dimensional electron gas. Given that the electron channel is one dimensional, the photoinduced conductance has plateaus at multiples of the quantum conductance 2e2/h. Superimposed on these broad conductance plateaus are many sharp, small, conductance steps associated with single-photon absorption events that produce individual photocarriers. This is a first step toward a photoconductive detector that could measure a single photon, while safely storing and protecting the spin degree of freedom of its photocarrier, but we have not actually achieved that goal.

Original languageEnglish
Article number201307
Pages (from-to)2013071-2013074
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number20
Publication statusPublished - 2002 May 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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