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Quantum dot chains

Lateral ordering of In 0.4 Ga 0.6 As quantum dots as a function of superlattice spacer thickness. Quantum dot chains. C. L. Rodriguez Reed College, Portland, OR Dr. Zhiming Wang University of Arkansas, Fayetteville, AR Dr. Greg Salamo University of Arkansas, Fayetteville, AR.

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Quantum dot chains

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  1. Lateral ordering of In0.4Ga0.6As quantum dots as a function of superlattice spacer thickness Quantum dot chains C. L. Rodriguez Reed College, Portland, OR Dr. Zhiming Wang University of Arkansas, Fayetteville, AR Dr. Greg Salamo University of Arkansas, Fayetteville, AR

  2. Quantum Dots • Highly valued for optoelectronic applications • Lasers • Quantum computing • Optical memory devices • Single photon detectors • SLDs • Require control of density and placement

  3. Quantum Dot Chains • Much work has focused on self assembly • Stranski-Krastanov (SK) method • Highly uniform • Minimizes growth errors • Ordering produced by multilayers

  4. Experiment • 9 Samples grown via Molecular Beam Epitaxy (MBE) • 16 iterated dot layers • InGaAs with GaAs spacer • Grown on GaAs (311)B substrate 10ML In0.4Ga0.6As XML GaAs Spacer 16X 10ML In0.4Ga0.6As GaAs(311)B

  5. Experiment: AFM • Used to analyze surface morphology • Sub-micron scale 3D images • Measures density and ordering

  6. Results and Discussion • AFM scans provided density and ordering information

  7. Results and Discussion • Ordering appears • Forms 2D checkerboard 30 ML 120 ML 127.5 ML 60 ML

  8. Results and Discussion • Chains appear • Forms 2D checkerboard 180 ML 135 ML 150 ML 210 ML

  9. Results and Discussion • Dot density proportional to lateral ordering • Transition from checkerboard to chain

  10. Conclusion

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