• Séminaire nano-électronique quantique
• Personne à contacter : Jeremie Viennot ()
• Salle Salle Rémy Lemaire K223, Institut Néel

Résumé : [Beware of the unusual day/time: Monday 11am !]. The recent discovery of intrinsic supercurrent diode effect (1), and its prompt observation in a rich variety of systems, has shown that nonreciprocal supercurrents naturally emerge when both space- and time-inversion symmetries are broken. I will report on both dc and ac manifestations of the Josephson diode effect in the non-linear inductance in planar Josephson junctions, based on a ballistic Al/InAs-heterostructure that is exposed to an in-plane magnetic field Bp (2). At low Bp a non-reciprocal term is found in the inductance that is linear in Bp. At higher Bp a sign reversal of the magnetochiral term is observed that can be traced back to a 0-pi-like transition in the current-phase relation (3). Different avenues for a theoretical interpretation are discussed. As pronounced date tunability of both the phi_0 shift and the diode efficiency in an asymmetric SQUID device demonstrates that Rashba spin-orbit interaction provides a substantial contribution to the Josephson diode effect (4). Ref.: [1] F. Ando et al., Nature 584, 373 (2020). [2] C. Baumgartner et al., Nature Nanotech. 17, 39 (2022). [3] C. Baumgartner et al., Nature Nanotech. (2023). [4] S. Reinhardt et al., arXiv.2308.01061

Liens :

• Séminaire LPMMC
• Personne à contacter : Léonie Canet ()
• Salle G421

Résumé : Soft matter systems are often governed by processes on multiple different time and length scales. Bridging the gap between these scales and numerically study emergent behavior of many-body systems thus usually requires the usage of coarse-grained models. In general situations in which the separation of time scales is incomplete, such coarse-grained models will feature non-Markovian memory effects and colored noise, as suggested by the Mori-Zwanzig formalism. In equilibrium systems, a plethora of methodologies have been derived to construct non-Markovian coarse-grained models. Their applicability, however, becomes questionable in non-equilibrium systems. In this talk I will give an introduction to non-Markovian modeling and provide examples for successful applications. Subsequently, I will explain why the presented methodology cannot be directly applied to non-equilibrium systems. At the end, I will present my personal roadmap towards developing theoretical foundations and data-driven coarse-grained models for out-of-equilibrium soft matter systems.

Liens :

• Séminaire nano-électronique quantique
• Personne à contacter : Jeremie Viennot ()
• Visio-conférence Zoom Depuis un navigateur internet : rejoindre le {seminaire}.
  Identifiant de réunion : 91808901596
  

Liens :

• Séminaire nano-électronique quantique
• Personne à contacter : Jeremie Viennot ()
• Visio-conférence Zoom Depuis un navigateur internet : rejoindre le {seminaire}.
  Identifiant de réunion : 91808901596
  

Liens :

• Séminaire nano-électronique quantique
• Personne à contacter : Jeremie Viennot ()
• Visio-conférence Zoom Depuis un navigateur internet : rejoindre le {seminaire}.
  Identifiant de réunion : 91808901596
  

Liens :

• Séminaire LPMMC
• Personne à contacter : Pierre Nataf ()
• Salle G421

Liens :

• Séminaire théorie
• Personne à contacter : Serge Florens ()
• Salle G421

Liens :Zurich University