Ground-state quantum geometry in superconductor–quantum dot chains

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2021
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Physical Review B. American Physical Society (APS). 2021, 103(1), 014516. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.103.014516
Zusammenfassung

Multiterminal Josephson junctions constitute engineered topological systems in arbitrary synthetic dimensions defined by the superconducting phases. Microwave spectroscopy enables the measurement of the quantum geometric tensor, a fundamental quantity describing both the quantum geometry and the topology of the emergent Andreev bound states in a unified manner. In this work we propose an experimentally feasible multiterminal setup of N quantum dots connected to N + 1 superconducting leads to study nontrivial topology in terms of the many-body Chern number of the ground state. Moreover, we generalize the microwave spectroscopy scheme to the multiband case and show that the elements of the quantum geometric tensor of the noninteracting ground state can be experimentally accessed from the measurable oscillator strengths at low temperature.

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530 Physik
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Andreev reflection, Geometric & topological phases, Superconductivity, Josephson junctions, superconducting devices, topological materials
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ISO 690KLEES, Raffael L., Juan Carlos CUEVAS, Wolfgang BELZIG, Gianluca RASTELLI, 2021. Ground-state quantum geometry in superconductor–quantum dot chains. In: Physical Review B. American Physical Society (APS). 2021, 103(1), 014516. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.103.014516
BibTex
@article{Klees2021Groun-51474.2,
  year={2021},
  doi={10.1103/PhysRevB.103.014516},
  title={Ground-state quantum geometry in superconductor–quantum dot chains},
  number={1},
  volume={103},
  issn={2469-9950},
  journal={Physical Review B},
  author={Klees, Raffael L. and Cuevas, Juan Carlos and Belzig, Wolfgang and Rastelli, Gianluca},
  note={Article Number: 014516}
}
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