Funding period: 2021 – 2024

Project leaders: Elke Scheer and Wolfgang Belzig

Scientific staff: Oliver Irtenkauf, Lukas Kammermeier, David Ohnmacht

Former members: Andreas Bloch, Danilo Nikolic, Laura Sobral Rey

In this project, we will study the interplay between quantum charge fluctuations and electromagnetic fields. The goal is to elucidate both theoretically and experimentally the role of charge fluctuations in the electronic transport through metallic and superconducting single-electron transistors far away from equilibrium. Experimentally, the nonequilibrium will be induced by microwave irradiation and probed by DC transport measurements at very low temperatures. The theoretical study is performed using a Keldysh real-time Green’s function approach.

List of publications

2024

• Fractional positional jumps in stochastic systems with tilted periodic double-well potentials
  M. Žonda, W. Belzig, E. Goldobin, T. Novotný
  Phys. Rev. B 110, 054306 – Published 7 August 2024
  also related to project C02
   
• Quartet Tomography in Multiterminal Josephson Junctions
  D. C. Ohnmacht, M. Coraiola, J. J. García-Esteban, D. Sabonis, F. Nichele, W. Belzig, J. C. Cuevas
  Phys. Rev. B 109, L241407 – published 26 June 2024
   
• Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction
  M. Coraiola, A. E. Svetogorov, D. Z. Haxell, D. Sabonis, M. Hinderling, S. C. ten Kate, E. Cheah, F. Krizek, R. Schott, W. Wegscheider, J. C. Cuevas, W. Belzig, and F. Nichele
  ACS Nano 2024, 18, 12, 9221–9231 - published 15 March 2024
   
• Interplay of Andreev Reflection and Coulomb Blockade in Hybrid Superconducting Single-Electron Transistors
  L. S. Rey, D. C. Ohnmacht, C. B. Winkelmann, J. Siewert, W. Belzig, and E. Scheer
  Phys. Rev. Lett. 132, 057001 – published 2 February 2024

2023

• Microscopic theory of supercurrent suppression by gate-controlled surface depairing
  S. Chakraborty, D. Nikolić, J. C. Cuevas, F. Giazotto, A. Di Bernardo, E. Scheer, M. Cuoco, and W. Belzig
  Phys. Rev. B 108, 184508 – published 13 November 2023
   
• Microwave-induced conductance replicas in hybrid Josephson junctions without Floquet—Andreev states
  D. Z. Haxell, M. Coraiola, D. Sabonis, M. Hinderling, S. C. ten Kate, E. Cheah, F. Krizek, R. Schott, W. Wegscheider, W. Belzig, J. C. Cuevas, and F. Nichele 
  Nat Commun 14, 6798 - published 26 October 2023
  also related to project A03
   
• Phase-engineering the Andreev band structure of a three-terminal Josephson junction
  M. Coraiola, D. Z. Haxell, D. Sabonis, H. Weisbrich, A. E. Svetogorov, M. Hinderling, S. C. ten Kate, E. Cheah, F. Krizek, R. Schott, W. Wegscheider, J. C. Cuevas, W. Belzig, and F. Nichele
  Nat Commun 14, 6784 - published 25 October 2023
  also related to project A03
   
• Microwave excitation of atomic scale superconducting bound states
  J. Siebrecht, H. Huang, P. Kot, R. Drost, C. Padurariu, B. Kubala, J. Ankerhold, J. C. Cuevas, and C. R. Ast
  Nat. Commun. 14, 6794 - published 25 October 2023
  also related to project A03
   
• DC Josephson effect between two Yu-Shiba-Rusinov bound states
  S. Chakraborty, D. Nikolić, R. S. Souto, W. Belzig, and J. C. Cuevas
  Phys. Rev. B 108, 094518 – published 27 September 2023
   
• Full counting statistics of Yu-Shiba-Rusinov bound states
  D. C. Ohnmacht, W. Belzig, and J. C. Cuevas
  Phys. Rev. Research 5, 033176 – published 11 September 2023
   
• Measurements of Phase Dynamics in Planar Josephson Junctions and SQUIDs
  D. Z. Haxell, E. Cheah, F. Křížek, R. Schott, M. F. Ritter, M. Hinderling, W. Belzig, C. Bruder, W. Wegscheider, H. Riel, and F. Nichele
  Phys. Rev. Lett. 130, 087002 - published 23 February 2023
   
• Calorimetry of a phase slip in a Josephson junction 
  E. Gümüş, D. Majidi, D. Nikolić, P. Raif, B. Karimi, J. T. Peltonen, E. Scheer, J. P. Pekola, H. Courtois, W. Belzig and C. B. Winkelmann
  Nat. Phys.(2023), 1745-2481 - published 6 January 2023

2022

• Non-reciprocity of Vortex-limited Critical Current in Conventional Superconducting Micro-bridges
  D. Suri, A. Kamra, T. N. G. Meier,  M. Kronseder,  W. Belzig,  C. H. Back, and C. Strunk
  Appl. Phys. Lett. 121, 102601 – published 06 September 2022
   
• Engineering the speedup of quantum tunneling in Josephson systems via dissipation
  D. Maile, J. Ankerhold, S. Andergassen, W. Belzig, and G. Rastelli
  Phys. Rev. B 106, 045408 – published 8 July 2022

2021

• Resonator-induced quantum phase transitions in a hybrid Josephson junction
  R. Hussein and W. Belzig
  Phys. Rev. B 104, L180504 – published 15 October 2021
   
• Revealing channel polarization of atomic contacts of ferromagnets and strong paramagnets by shot-noise measurements
  M. W. Prestel, M. Strohmeier, W. Belzig, and E. Scheer
  Phys. Rev. B. 104, 115434 –  published 29 September 2021

Further Publications

• Proximity Effect and Multiple Andreev Reflections in Gold Atomic Contacts

  E. Scheer, W. Belzig, Y. Naveh, M. H. Devoret, D. Esteve, and C. Urbina
  Phys. Rev. Lett. 86, 284 – Published 8 January 2001

• Coulomb Blockade and Multiple Andreev Reflection in a Superconducting Single-Electron Transistor
  T. Lorenz, S. Sprenger, and E. Scheer
  J. Low Temp. Phys. 191, 301-315 - Published 6 December 2017
   
• Dynamical Coulomb Blockade as a Local Probe for Quantum Transport
  J. Senkpiel, J. C. Klöckner, M. Etzkorn, S. Dambach, B. Kubala, W. Belzig, A. L. Yeyati, J. C. Cuevas, F. Pauly, J. Ankerhold, C. R. Ast, and K. Kern
  Phys. Rev. Lett. 124, 156803 – Published 16 April 2020