Properties of magnetic molecules on superconducting and normal metal substrates

PhD Program

Speaker

Divya Jyoti

When

2025/09/30
10:00

Place

CFM Auditorium (Donostia/San Sebastián)

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PhD Thesis defense by Divya Jyoti

Supervisor: Nicolas Lorente (CSIC, DIPC Associate) and Deung-Jang Choi (CFM, Ikerbasque, DIPC Associate)

Superconductivity and magnetism - Quantum Phenomenon on Surfaces

This thesis explores how magnetic impurities and nanoscale structures influences superconductivity and generate emergent quantum states. Combining self-consistent Bogoliubov-de Gennes theory with atomically resolved scanning tunneling microscopy (STM), we investigate Yu-Shiba-Rusinov states, quantum phase transitions, and Shiba bands in magnetic chains, as well as confinement effects in superconducting quantum corrals that influence quasiparticle spectra and potential Majorana bound states. Experimentally, we study nickelocene molecules on Au(111), Pb(100), and NbSe2 substrates, correlating STM spectroscopy with density functional theory to reveal how molecular adsorption, spin excitations, and anisotropy respond to substrate properties and local environment. These results demonstrate how engineered nanostructures can tune superconducting order at the atomic scale. Collectively, this work advances our understanding of the interplay between magnetism, superconductivity, and topology, providing a foundation for designing quantum materials with tailored in-gap states and enabling platforms for topological quantum computing and molecular-scale quantum devices.