Pyramidal $\text{GaAs}/{\text{Al}}_{z}{\text{Ga}}_{1\ensuremath{-}z}\text{As}$ quantum wire/dot systems with controlled heterostructure potential

Pyramidal $GaAs / {Al}_{z} {Ga}_{1 - z} As$ quantum wire/dot systems with controlled heterostructure potential

Q. Zhu, J. D. Ganière, Z. B. He, K. F. Karlsson, M. Byszewski, E. Pelucchi, A. Rudra, and E. Kapon

Phys. Rev. B 82, 165315 – Published 8 October 2010

Abstract

The structural and optical properties of controlled-heterostructure-potential, low-dimensional GaAs/AlGaAs nanostructures self-formed during organometallic chemical vapor deposition in tetrahedral pyramids etched in (111)B-GaAs substrates, are investigated using electron microscopy, cathodoluminescence, photoluminescence (PL), photon correlation spectroscopy, and theoretical modeling. Quantum wires/dots with AlGaAs cores with growth-controlled dimensions are formed, with a system of well-defined, low-dimensional nanostructure barriers around them. Transitions between carrier states confined in the AlGaAs quantum wires and dots are identified in the PL spectra, with features in good agreement with model calculations. Emission of single-photons and bunched-photon pairs is observed using temporal photon correlation spectroscopy. This self-formed nanostructure system provides new ways for shaping low-dimensional quantum structures and their heterostructure environment.

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Received 12 April 2010

DOI:https://doi.org/10.1103/PhysRevB.82.165315

Authors & Affiliations

Q. Zhu^1,*,†, J. D. Ganière², Z. B. He^1,‡, K. F. Karlsson^1,§, M. Byszewski¹, E. Pelucchi^1,∥, A. Rudra¹, and E. Kapon¹

¹Laboratory of Physics and Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
²Laboratory of Quantum Optoelectronics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

^*FAX: +41 21 693 54 80; qing.zhu@epfl.ch
^†Present address: Department of Physics, Warsaw University, ul. Hoza 69, 00-681 Warsaw, Poland.
^‡Present address: Laboratoire de Physique des Interfaces et Couches Minces (LPICM), Ecole Polytechnique, 91128 Palaiseau Cedex, France.
^§Present address: IFM Material Physics, Linköping University, S-581 83 Linköping, Sweden.
^∥Present address: Tyndall National Institute “LeeMaltings” Prospect Row Cork, Ireland.

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Vol. 82, Iss. 16 — 15 October 2010

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Physical Review B

covering condensed matter and materials physics

Pyramidal $GaAs / {Al}_{z} {Ga}_{1 - z} As$ quantum wire/dot systems with controlled heterostructure potential

Q. Zhu, J. D. Ganière, Z. B. He, K. F. Karlsson, M. Byszewski, E. Pelucchi, A. Rudra, and E. Kapon

Phys. Rev. B 82, 165315 – Published 8 October 2010

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Physical Review B

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Pyramidal GaAs/AlzGa1−zAs quantum wire/dot systems with controlled heterostructure potential

Q. Zhu, J. D. Ganière, Z. B. He, K. F. Karlsson, M. Byszewski, E. Pelucchi, A. Rudra, and E. Kapon

Phys. Rev. B 82, 165315 – Published 8 October 2010

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Pyramidal $GaAs / {Al}_{z} {Ga}_{1 - z} As$ quantum wire/dot systems with controlled heterostructure potential