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      Tuning terahertz transitions in a double-gated quantum ring

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      PRB_96_235430_Collier_rings_17.pdf (626.0Kb)
      Date
      2017-12-21
      Author
      Collier, TP
      Saroka, VA
      Portnoi, ME
      Date issued
      2017-12-21
      Journal
      Physical review B: Condensed matter and materials physics
      Type
      Article
      Language
      en
      Publisher
      American Physical Society
      Rights
      © 2017 American Physical Society
      Abstract
      We theoretically investigate the optical functionality of a semiconducting quantum ring manipulated by two electrostatic lateral gates used to induce a double quantum well along the ring. The well parameters and corresponding interlevel spacings, which lie in the THz range, are highly sensitive to the gate voltages. Our analysis shows that selection rules for interlevel dipole transitions, caused by linearly polarized excitations, depend on the polarization vector angle with respect to the gates. In striking difference from the conventional symmetric double well potential, the ring geometry permits polarization-dependent transitions between the ground and second excited states, allowing the use of this structure in a three-level lasing scheme.
      Funders/Sponsor
      We acknowledge support from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom, via the EPSRC Centre for Doctoral Training in Metamaterials XM2 (Grant No. EP/L015331/1). This work was also supported by the EU FP7 ITN NOTEDEV (Grant No. FP7-607521); EU H2020 RISE project CoExAN (Grant No. H2020-644076); and FP7 IRSES projects CANTOR (Grant No. FP7-612285), QOCaN (Grant No FP7-316432), and InterNoM (Grant No FP7-612624).
      Description
      This is the final version of the article. Available from American Physical Society via the DOI in this record.
      Citation
      Vol. 96 (23), article 235430
      DOI
      https://doi.org/10.1103/PhysRevB.96.235430
      URI
      http://hdl.handle.net/10871/30754
      ISSN
      1098-0121
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      • Physics

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