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  • Letter
  • Open Access

Symmetry-controlled singlet-triplet transition in a double-barrier quantum ring

Heidi Potts1,*, Josef Josefi2, I-Ju Chen1, Sebastian Lehmann1, Kimberly A. Dick1,3, Martin Leijnse1, Stephanie M. Reimann2, Jakob Bengtsson2, and Claes Thelander1,†

  • 1Division of Solid State Physics and NanoLund, Lund University, SE-221 00 Lund, Sweden
  • 2Mathematical Physics and NanoLund, Lund University, SE-221 00 Lund, Sweden
  • 3Centre for Analysis and Synthesis, Lund University, SE-221 00 Lund, Sweden

  • *heidi.potts@ftf.lth.se
  • †claes.thelander@ftf.lth.se
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Phys. Rev. B 104, L081409 – Published 25 August, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L081409

Abstract

We engineer a system of two strongly confined quantum dots to gain reproducible electrostatic control of the even-electron spin at zero magnetic field. Coupling the dots in a tight ring-shaped potential with two tunnel barriers, we demonstrate that an electric field can switch the electron ground state between a singlet and a triplet configuration. Comparing our experimental cotunneling spectroscopy data to a full many-body treatment of interacting electrons in a double-barrier quantum ring, we find excellent agreement in the evolution of many-body states with electric and magnetic fields. The calculations show that the singlet-triplet energy crossover, not found in conventionally coupled quantum dots, is made possible by the ring-shaped geometry of the confining potential.

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Phys. Rev. B 104, L081409– Published 25 August, 2021
  • Received 23 April 2021
  • Revised 20 July 2021
  • Accepted 27 July 2021
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