Moiré dispersion of edge states in spin chains on superconductors

 We show that the oscillations with energy of edge states in in-gap states induced by spin chians on s-wave superconductors are due to a moiré superstructure due to the wavevector of electronic interactions (Fermi wave vector) and the periodicity imposed by the spin lattice. This work explains recent experiments on Majorana bound states and predicts that is possible to have topological states at non-zero energies.

Cristina Mier, Deung-Jang Choi, and Nicolás Lorente Phys. Rev. Research 4, L032010 (2022)


Superconducting Scanning Tunneling Microscope Tip to Reveal Sub-millielectronvolt Magnetic Energy Variations on Surfaces

We show extraordinary energy resolution with an STM by using a superconducting tip with sharp quasiparticle density of states. This permits us to reveal small changes in molecular magnetic anisotropy energy depending on the adsorption site and orientation. As a consequence, we show that a two-dimensional array of nickelocene molecules on a Pb(111) substrate is highly non-collinear. 



Vibrations with Kondo at the single-molecule level

  Check out our last paper in Nano Letters. Here, we do a follow-up of our Science paper, changing the nickelocene molecular tip by a cobaltocene one. Cobaltocene is spin 1/2 and displays a strong Kondo peak that couples to multiple vibrations. We show that some spectral features are due to the coupling of Kondo plus molecular vibrations.


New paper in Nano Letters

Check out our last paper in Nano Letters. In this theoretical-experimental study in collaboration with CNRS colleagues we show how an organic molecule becomes magnetic after being doped by Aluminum atoms. This is interesting since we show how magnetism can be turned on without the need of transition metal atoms, but with a light, non-magnetic dopant.


Science paper featured in Mapping Ignorance

A summary of our Science paper showing magnetism on the atomic scale, has been featured in Mapping Ignorance.


New paper in Science

Our paper on Science about atomic-scale spin sensing with a single molecule at the apex of a scanning tunneling microscope. Check out our latest work published in Science in collaboration with colleagues from Argentina, France, and Germany.


New paper in Reviews of Modern Physics

Our paper on Reviews of Modern Physics about atomic spin chains on surfaces studied by scanning probes: theoretical and experimental details. Checkout a summary of the article in Mapping Ignorance.