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Your search keyword '"Pons, Stéphane"' showing total 2 results
Start Over Author "Pons, Stéphane" Publication Type Electronic Resources
2 results on '"Pons, Stéphane"'

1. Polarization dependence of angle-resolved photoemission with submicron spatial resolution reveals emerging one-dimensionality of electrons in NbSe3

Author

Swiss National Science Foundation, Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Ministerio de Ciencia e Innovación (España), Comisión Nacional de Investigación Científica y Tecnológica (Chile), Centre National de la Recherche Scientifique (France), Commissariat à l'Ènergie Atomique et aux Ènergies Alternatives (France), Valbuena, Miguel Ángel Rodríguez, Chudzinski, Piotr, Pons, Stéphane, Conejeros, Sergio, Alemany, Pere, Canadell, Enric, Berger, Helmuth, Frantzeskakis, Emmanouil, Ávila, José, Asensio, María C., Giamarchi, Thierry, Grioni, Marco, Swiss National Science Foundation, Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Ministerio de Ciencia e Innovación (España), Comisión Nacional de Investigación Científica y Tecnológica (Chile), Centre National de la Recherche Scientifique (France), Commissariat à l'Ènergie Atomique et aux Ènergies Alternatives (France), Valbuena, Miguel Ángel Rodríguez, Chudzinski, Piotr, Pons, Stéphane, Conejeros, Sergio, Alemany, Pere, Canadell, Enric, Berger, Helmuth, Frantzeskakis, Emmanouil, Ávila, José, Asensio, María C., Giamarchi, Thierry, and Grioni, Marco

Abstract

In materials with nearly commensurate band filling the electron liquid may spontaneously separate into components with distinct properties, yielding complex intra- and interunit cell ordering patterns and a reduced dimensionality. Polarization-dependent angle-resolved photoemission data with submicron spatial resolution demonstrate such an electronic self-organization in NbSe3, a compound considered to be a paradigm of charge order. The new data indicate the emergence of a novel order, and reveal the one-dimensional (1D) physics hidden in a material which naively could be considered the most three dimensional of all columnar chalcogenides. The 1D physics is evidenced by a new selection rule—in two polarizations we observe two strikingly different dispersions each closely resembling apparently contradicting results of previous studies of this material.

Published
2019

2. Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface

Author

European Science Foundation, Ministerio de Educación y Ciencia (España), Gambardella, Pietro, Stepanow, Sebastian, Dmitriev, Alexandre, Honolka, J., Groot, Frank M. F. de, Lingenfelder, Magalí, Gupta, Subhra Sen, Sarma, D. D., Bencok, Peter, Stanescu, Stefan, Clair, Sylvain, Pons, Stéphane, Lin, Nian, Seitsonen, Ari P., Brune, H., Barth, Johannes V., Kern, Klaus, European Science Foundation, Ministerio de Educación y Ciencia (España), Gambardella, Pietro, Stepanow, Sebastian, Dmitriev, Alexandre, Honolka, J., Groot, Frank M. F. de, Lingenfelder, Magalí, Gupta, Subhra Sen, Sarma, D. D., Bencok, Peter, Stanescu, Stefan, Clair, Sylvain, Pons, Stéphane, Lin, Nian, Seitsonen, Ari P., Brune, H., Barth, Johannes V., and Kern, Klaus

Abstract

Magnetic atoms at surfaces are a rich model system for solid-state magnetic bits exhibiting either classical or quantum behaviour. Individual atoms, however, are difficult to arrange in regular patterns. Moreover, their magnetic properties are dominated by interaction with the substrate, which, as in the case of Kondo systems, often leads to a decrease or quench of their local magnetic moment. Here, we show that the supramolecular assembly of Fe and 1,4-benzenedicarboxylic acid molecules on a Cu surface results in ordered arrays of high-spin mononuclear Fe centres on a 1.5nm square grid. Lateral coordination with the molecular ligands yields unsaturated yet stable coordination bonds, which enable chemical modification of the electronic and magnetic properties of the Fe atoms independently from the substrate. The easy magnetization direction of the Fe centres can be switched by oxygen adsorption, thus opening a way to control the magnetic anisotropy in supramolecular layers akin to that used in metallic thin films.

Published
2009

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