Single-atomic-layered quantum wells built in wide-gap semiconductors LnCuOCh (Ln=lanthanide, Ch=chalcogen)

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  • Single-atomic-layered quantum wells built in wide-gap semiconductors<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Ln</mml:mi><mml:mi mathvariant="normal">CuO</mml:mi><mml:mi>Ch</mml:mi></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi>L</mml:mi><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">lanthanide</mml:mi><mml:mo>,</mml:mo></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>h</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">chalcogen</mml:mi><mml:mo>)</mml:mo></mml:math>
Published
2004-04-05
Resource Type
journal article
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  • Copyright © 2004 American Physical Society
DOI
  • 10.1103/physrevb.69.155305
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Published by the American Physical Society through the American Institute of Physics

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Description

LnCuOCh (Ln=lanthanide, Ch=chalcogen) layered oxychalcogenides are wide-gap p-type semiconductors composed of alternately stacked (Ln2O2)2+ oxide layers and (Cu2Ch2)2- chalcogenide layers. Energy band calculations revealed that Cu-Ch hybridized bands only spread in the (Cu2Ch2)2- layers, which suggests that hole carriers in these bands are confined by the potential barriers formed by the (Ln2O2)2+ layers. Stepwise absorption spectra of a series of LnCuOCh experimentally verified that an exciton in the (Cu2Ch2)2- layers shows a two-dimensional behavior. These theoretical and experimental results indicate that LnCuOCh has “natural multiple quantum wells” built into its layered structure.

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