Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Topology: Other Topics
TT 28.6: Vortrag
Dienstag, 19. März 2024, 11:00–11:15, H 3025
Time-frequency representation of Andreev-reflected charge pulses — •Benjamin Roussel1, Pablo Burset2, and Christian Flindt1 — 1Aalto University, Aalto, Finland — 2Universidad Autonoma de Madrid, Madrid, Spain
The most fundamental AC electric current consists of a single electron and a single hole at each period of the drive. While this has been a long-held theoretician dream, the experimental progress of the past 15 years have made it come true. It is now possible to generate, manipulate and probe electric current down to a single charge in a ballistic conductor. This is the focus of electron quantum optics, in which electrons are manipulated at the most elementary level, similarly to photons in quantum optics.
The field has now reached maturity, demonstrating the experimental techniques, and is now envisioned for technological applications, in particular in metrology. However, some aspects of electronic correlations have yet to be explored. At the interface between a normal metal and a superconductor, Andreev reflections can happen, producing a quantum superposition of an electron and a hole. This generates superconducting correlations, that can be exploited for electron quantum optics.
In this talk, I will present how Andreev reflections can be understood using the language of electron quantum optics. Introducing Wigner-like time-frequency representation for this process, I will analyze how an incoming electron is scattered by the interface.
Keywords: Electron quantum optics; Superconductivity; Andreev reflection; Time-frequency representation