Dynamic light-matter coupling across multiple spatial dimensions in a quantum dots-in-a-well heterostructure

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Semiconductor heterostructures incorporating multiple degrees of spatial confinement have recently attracted substantial interest for photonic applications. One example is the quantum dots-in-a-well (DWELL) heterostructure, consisting of zero-dimensional quantum dots embedded in a two-dimensional quantum well and surrounded by three-dimensional bulk material. This structure offers several advantages over conventional photonic devices while providing a model system for the study of light-matter interactions across multiple spatial dimensions. Here, we use ultrafast differential transmission spectroscopy2 to temporally and spectrally resolve density-dependent carrier dynamics in a DWELL heterostructure. We observe excitation-dependent shifts of the quantum dot energy levels at low densities, while at high ... continued below

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Prasankumar, Rohit P; Taylor, Antoinette J; Chow, W W; Attaluri, R S & Shenoi, R January 1, 2009.

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Semiconductor heterostructures incorporating multiple degrees of spatial confinement have recently attracted substantial interest for photonic applications. One example is the quantum dots-in-a-well (DWELL) heterostructure, consisting of zero-dimensional quantum dots embedded in a two-dimensional quantum well and surrounded by three-dimensional bulk material. This structure offers several advantages over conventional photonic devices while providing a model system for the study of light-matter interactions across multiple spatial dimensions. Here, we use ultrafast differential transmission spectroscopy2 to temporally and spectrally resolve density-dependent carrier dynamics in a DWELL heterostructure. We observe excitation-dependent shifts of the quantum dot energy levels at low densities, while at high densities we observe an anomalous induced absorption at the quantum dot excited state that is correlated to quantum well population dynamics. These studies of density-dependent light-matter interactions across multiple coupled spatial dimensions provide clues to the underlying physics governing quantum dot properties, with important implications for DWELL-based photonic devices.

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  • Journal Name: Nature Photonics

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  • Report No.: LA-UR-09-00840
  • Report No.: LA-UR-09-840
  • Grant Number: AC52-06NA25396
  • Office of Scientific & Technical Information Report Number: 956408
  • Archival Resource Key: ark:/67531/metadc934932

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  • January 1, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 9, 2016, 11:17 p.m.

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Prasankumar, Rohit P; Taylor, Antoinette J; Chow, W W; Attaluri, R S & Shenoi, R. Dynamic light-matter coupling across multiple spatial dimensions in a quantum dots-in-a-well heterostructure, article, January 1, 2009; [New Mexico]. (digital.library.unt.edu/ark:/67531/metadc934932/: accessed August 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.