Yu-Shiba-Rusinov subgap excitations in hybrid superconductor/semiconductor nanowires containing quantum dots

  • IFISC Seminar

  • Ramón Aguado
  • Instituto de Ciencia de Materiales de Madrid, CSIC
  • 2 de Junio de 2022 a las 14:30
  • IFISC Seminar Room
  • Sync with iCal
  • Announcement file

The physics of a quantum impurity in a superconductor is governed by the fermionic parity and spin of the two possible ground states, doublet or singlet, and their corresponding Yu-Shiba-Rusinov subgap excitations. After an introduction about their role in hybrid superconductor/semiconductor nanowires containing quantum dots [1], I will focus on semiconducting nanowires fully wrapped by a superconductor where an external magnetic flux gives rise to new regimes hitherto unexplored [2].

In the second part, I will discuss the physics of a superconducting qubit whose Josephson energy is governed by a fully tunable quantum dot. Specifically, a circuit QED setup allows to probe both its ground state and quasiparticle dynamics, resulting in, arguably, the most in-depth experimental study of a superconducting quantum impurity to date [3]. These results hold promise for realizing Andreev qubits with long parity lifetimes.

[1] Lee et al Phys. Rev. Lett. 109, 186802 (2012); Žitko et al, Phys. Rev. B 91, 045441 (2015);  Lee et al, Nature Nanotech., 9, 79-84 (2014). [2] Valentini et al, Science 373, 82-88 (2021); Escribano et al, Phys. Rev. B 105, 045418 (2022). [3] Bargerbos et al arXiv:2202.12754. PRX Quantum, in press.

Note the unusual day of the week. The seminar is presential with parallel zoom stream: https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09

Detalles de contacto:

Rosa Lopez

Contact form

Esta web utiliza cookies para la recolección de datos con un propósito estadístico. Si continúas navegando, significa que aceptas la instalación de las cookies.

Más información De acuerdo