Site-controlled quantum dots fabricated using an atomic-force microscope assisted technique

  • HZ Song1Email author,

    Affiliated with

    • T Usuki1,

      Affiliated with

      • T Ohshima1,

        Affiliated with

        • Y Sakuma2,

          Affiliated with

          • M Kawabe2,

            Affiliated with

            • Y Okada3,

              Affiliated with

              • K Takemoto1,

                Affiliated with

                • T Miyazawa1,

                  Affiliated with

                  • S Hirose1,

                    Affiliated with

                    • Y Nakata1,

                      Affiliated with

                      • M Takatsu1 and

                        Affiliated with

                        • N Yokoyama1

                          Affiliated with

                          Nanoscale Research Letters20061:160

                          DOI: 10.1007/s11671-006-9012-x

                          Published: 3 August 2006

                          Abstract

                          An atomic-force microscope assisted technique is developed to control the position and size of self-assembled semiconductor quantum dots (QDs). Presently, the site precision is as good as ± 1.5 nm and the size fluctuation is within ± 5% with the minimum controllable lateral diameter of 20 nm. With the ability of producing tightly packed and differently sized QDs, sophisticated QD arrays can be controllably fabricated for the application in quantum computing. The optical quality of such site-controlled QDs is found comparable to some conventionally self-assembled semiconductor QDs. The single dot photoluminescence of site-controlled InAs/InP QDs is studied in detail, presenting the prospect to utilize them in quantum communication as precisely controlled single photon emitters working at telecommunication bands.

                          Keywords

                          Quantum dot Site-Control Atomic-force microscope Local oxidation Quantum computer Quantum communication

                          [135]

                          Authors’ Affiliations

                          (1)
                          Nanotechnology Research center, Fujitsu Lab. Ltd.
                          (2)
                          Nanomaterials Laboratory, National Institute for Materials Science (NIMS)
                          (3)
                          Institute of Applied Physics, University of Tsukuba

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                          Copyright

                          © to the authors 2006