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SYCQ: Symposium Correlated Quantum Matter – From Cold Atoms to the Solid State

SYCQ 1: Correlated Quantum Matter – From Cold Atoms to the Solid State

SYCQ 1.2: Invited Talk

Tuesday, September 9, 2025, 11:15–11:45, ZHG008

Realization of Andreev-molecules — •Szabolcs Csonka — MTA-BME Superconducting Nanoelectronics Momentum Research Group, Department of Physics, Budapest University of Technology and Economics

Understanding the spectrum of individual atoms set the start of quantum mechanics 100 years ago and the learnt new concepts helped to understand more complex quantum systems like molecules, solids or superconductors. Present technologies allow us to realize artificial atoms and try to couple them one-by-one to create synthetic state-of-matters. In this talk I will present special molecules, so called Andreev-molecules, which are built up from artificial atoms coupled by superconductors. We will explain the basic properties of an artificial atom coupled to a superconductor; describe the role of crossed Andreev-reflection when more atoms are coupled. Finaly we will present experimental realization of two types of Andreev-molecule: the analog of H_2 and H_2O molecule. The polymerization of such superconducting molecules into a 1D chain is an exciting direction, which holds the promise to realize a topological superconducting system, the Kitaev-chain.

Keywords: quantum dots; superconductivity; spectroscopy; topological superconductors; Andreev-reflection