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PreprintCC BY 4.0arXiv

Negative charging energy in LaAlO3/SrTiO3 quantum dots induced by SrTiO3 polarization

  • J. Czarnecki
  • A. Sierant
  • B. Szafran
  • P. Szumniak
  • T. S. Jespersen
  • G. Meucci
  • T. Jansen
  • R. Citro
  • A. Maiellaro
  • N. Bergeal
  • M. Bibes
  • M. Salluzzo
2 more authors
  • A. Kalaboukhov
  • P. Wójcik
Open at sourcePDFDOICite

Abstract

We propose a microscopic mechanism for the negative charging energy in LaAlO3/SrTiO3 quantum dots, arising from the electrostatic image charge associated with the paraelectric response of SrTiO3. Using a self-consistent configuration-interaction approach that accounts for both Coulomb repulsion and image-charge interactions, we find a robust regime of electron pairing whose strength is tunable through the confinement potential and the effective image-charge distance, set by the thickness of the interfacial two-dimensional electron gas. Our results establish dielectric image-charge effects as a route to controllable electron pairing in oxide quantum dots and other materials with a strong dielectric response.

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Cite

BibTeXRIS
BibTeX
@misc{czarnecki2026negative,
  title = {{Negative charging energy in LaAlO$_3$/SrTiO$_3$ quantum dots induced by SrTiO$_3$ polarization}},
  author = {J. Czarnecki and A. Sierant and B. Szafran and P. Szumniak and T. S. Jespersen and G. Meucci and T. Jansen and R. Citro and A. Maiellaro and N. Bergeal and M. Bibes and M. Salluzzo and A. Kalaboukhov and P. Wójcik},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.07878},
  eprint = {2610.07878},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.07878},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Negative charging energy in LaAlO_3/SrTiO_3 quantum dots induced by SrTiO_3 polarization
AU  - J. Czarnecki
AU  - A. Sierant
AU  - B. Szafran
AU  - P. Szumniak
AU  - T. S. Jespersen
AU  - G. Meucci
AU  - T. Jansen
AU  - R. Citro
AU  - A. Maiellaro
AU  - N. Bergeal
AU  - M. Bibes
AU  - M. Salluzzo
AU  - A. Kalaboukhov
AU  - P. Wójcik
PY  - 2026
DA  - 2026/10/13
PB  - arXiv
DO  - 10.48550/arxiv.2610.07878
UR  - https://arxiv.org/abs/2610.07878
AB  - We propose a microscopic mechanism for the negative charging energy in LaAlO_3/SrTiO_3 quantum dots, arising from the electrostatic image charge associated with the paraelectric response of SrTiO_3. Using a self-consistent configuration-interaction approach that accounts for both Coulomb repulsion and image-charge interactions, we find a robust regime of electron pairing whose strength is tunable through the confinement potential and the effective image-charge distance, set by the thickness of the interfacial two-dimensional electron gas. Our results establish dielectric image-charge effects as a route to controllable electron pairing in oxide quantum dots and other materials with a strong dielectric response.
ER  -