Molecular radicals on surfaces offer a novel way to form many body quantum states useful for quantum information applications. We will discuss two STM use cases, in which molecular radicals are key for the functionality.
Radicals that hybridize with the conduction electrons of a normal metal form Kondo states that can be used to indirectly read the spin state of single molecular magnets via the so called spin cascade effect. We present a simple method to extend the measurement scheme to access the nuclear spin state of 163DyPc2 using STM without the need for a magnetic field. We observed T1 times of the nuclear spins in excess of minutes at 35 mK. The indirect read out scheme is nearly non-demolishing in character, opening the potential for quantum computation based on nuclear spins.
In low-dimensional magnet/superconductor hybrid systems using purely organic radicals, a lattice of coupled spin-1/2 states in molecular islands induces Yu−Shiba−Rusinov subgap states in the tunneling spectra, that are conceptually much more simple than similar states formed by multi-orbital transition metal atoms. In these structures, we observe low-energy (<µeV) states localized at edges of the molecular island that are consistent with emergent topologically protected modes of a topological superconductor.
The seminar will end with time for questions and discussions.
