High critical temperature superconductor (HTS) nano devices : Q uantum tools for probing the nature of HTSs

Orateur : Prof. Thilo Bauch, Chalmers University , Sweden

Abstract : The nature of High critical Temperature Superconductivity is one of the main unresolved problems in solid-state physics. Superconductive devices at the nanoscale can have a fundamental role in shedding light into the mechanism leading to High critical Temperature Superconductivity. Indeed, our recent achievements in nano-patterning of HTS devices such as a single electron transistor (SET) allow us to explore the superconducting state in regimes never accessed before. Indeed, we univocally show via the measurement of the parity effect in a YBa2Cu3O7-x SET that the superconducting order parameter breaks time reversal symmetry in contrast to a pure d-wave symmetry. This is of fundamental importance for the development of any new theoretical HTS modeling. Moreover, our nano-patterning process allows for new exciting developments towards quantum-limited sensors such as single photon detectors and nano Superconducting Quantum Interference Devices (nanoSQUIDs) with unprecedented magnetic flux sensitivity.

Télécharger dans mon agenda