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Maria C. Asensio: Electronic and Chemical nano-imaging of wonder materials beyond graphene

posted 7 Apr 2017, 04:44 by Peter Bøggild

Synchrotron SOLEIL & University Paris-Saclay, FRANCE

Recently, remarkable progress has been achieved in modern microscopies. However, even if they have attained exceptional results, the problem of providing powerful high-resolution spectroscopic tools for probing at nano- and  mesoscopic-scale still remains. This is particularly the case for an innovative and powerful technique named k-nanoscope or NanoARPES (Nano Angle Resolved Photoelectron Spectroscopy). This cutting-edge nanoscope is able to determine the momentum and spatial resolved electronic structure, disclosing the implications of heterogeneities and confinement on the valence band electronic states typically present close to the Fermi level, with not more than 15-20 eV of binding energy. 

In this presentation, the more relevant results of the recently built ANTARES nanoscope beamline at the synchrotron SOLEIL will be disclosed [1]. In particular, nanoARPES findings describing the electronic band structure of mono-atomic exfoliated graphene on SiO2 substrates, epitaxial and polycrystalline monolayer graphene films grown on copper and SiC [2] will be presented and Graphene/MoS2 heterostrustures. Electronic and chemical mapping with high energy, momentum and lateral resolution have provided relevant features like gap-size, doping, effective mass, Fermi velocity and electron-phonon coupling.among other properties.  Finally, special mentions will be dedicated to the recently reported results on the spin-charge separation in metallic MoSe2 grain boundary [3].

[1] C. Chen et al., Nature Communications, 6 (2015) 8585

[2] I, Razado-Colambo et al., Nature Scientific Reports 6 (2016) 27261

[3] Y. Ma, et al., Nature Communications 8 (2017) 14231.

Currently, Permanent Research Staff of the SOLEIL French synchrotron source and the Université Paris-Saclay, Professor Maria Asensio is also Permanent staff of the Institute of Material Science of Madrid, in Spain working in the area of electronic structure determination by using low energy Synchrotron radiation. Maria Asensio commenced her academic career in Argentina, where she finished her PhD degree in Surface Science. Then she held a Senior Lecturer in Physics at the Autonomous University of Madrid, followed by positions at the University of Warwick in England and at the Fritz Haber Institute of the Max-Planck in Berlin, Germany, collaborating in several large European Research Projects. Asensio’s research comprises studying the application of a wide-ranged conventional and Synchrotron Radiation Based techniques devoted to the characterization of advanced materials, in the area of Solid State Physics. Lately, she has conceived an innovative chemical and electronic imaging technique combining angle resolved photoemission and microscopy, named “k-nanoscope or NanoARPES”. She is author of more than 278 publications and had more than 100 invited talks.