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      Unpinning of heavy hole spin in magnetic quantum dots

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      Embargo Lift Date: 2018-05-11
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      Author
      Dinu, I. V.
      Moldoveanu, V.
      Dragomir, R.
      Tanatar, Bilal
      Date
      2017
      Source Title
      Physica Status Solidi (B) Basic Research
      Print ISSN
      0370-1972
      Publisher
      Wiley-VCH Verlag
      Volume
      254
      Issue
      5
      Pages
      1600800-1 - 1600800-4
      Language
      English
      Type
      Article
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      Abstract
      Using the k · p theory and configuration interaction method, we analyze the effect of heavy hole–light hole (HH–LH) mixing in CdTe quantum dots (QDs) with a single manganese (Mn) ion. We find that the hole-Mn exchange switches the coupling between two excitons whose Luttinger spinors have both HH and LH components. If the magnetic dopant is off-centered and the QD is subjected to a single π pulse the system periodically bounces between bright and dark mostly HH excitons with opposite HH spins. A pump-and-probe setup allows to estimate the efficiency of this HH spin unpinning from the biexciton response. The biexciton absorption spectrum is also discussed.
      Keywords
      CdTe
      Dynamics
      Excitons
      Kohn–Luttinger theory
      Magnetic quantum dots
      Manganese
      Permalink
      http://hdl.handle.net/11693/36398
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/pssb.201600800
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      • Department of Physics 2299
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