Publications de Philippe Bugnon

Radial Spin Texture of the Weyl Fermions in Chiral Tellurium

Majed Chergui, Henrik Moodysson Rønnow, Marco Grioni, Oleg Yazyev, Luc Testa, Daniel Gosalbez Martinez, Michele Puppin, Philippe Bugnon, Luca Moreschini, Alberto Crepaldi

Trigonal tellurium, a small-gap semiconductor with pronounced magneto-electric and magneto-optical responses, is among the simplest realizations of a chiral crystal. We have studied by spin- and angle-resolved photoelectron spectroscopy its unconventional ...

AMER PHYSICAL SOC2020

Light-induced charge transfer at the CH3NH3PbI3/TiO2 interface-a low-temperature photo-electron paramagnetic resonance assay

László Forró, Endre Horvath, Andrzej Sienkiewicz, Bálint Náfrádi, Philippe Bugnon, Péter Szirmai, Márton Kollár, Pavao Roko Andricevic, Anastasiia Glushkova, Konstantins Mantulnikovs

The performance of organic-inorganic metal halide perovskites-based (MHPs) photovoltaic devices critically depends on the design and material properties of the interface between the light-harvesting MHP layer and the electron transport layer (ETL). Therefo ...

2020

Crystallization and Organic Field-Effect Transistor Performance of a Hydrogen-Bonded Quaterthiophene

Rosario Scopelliti, Holger Frauenrath, Anne-Clémence Corminboeuf, Philippe Bugnon, Stéphane Suarez, Riccardo Petraglia, Bilal Özen, Jan Gebers, Piotr De Silva

Crystalline thin films of pi-conjugated molecules are relevant as the active layers in organic electronic devices. Therefore, materials with enhanced control over the supramolecular arrangement, crystallinity, and thin-film morphology are desirable. Herein ...

2020

Light-Induced Renormalization of the Dirac Quasiparticles in the Nodal-Line Semimetal ZrSiSe

Majed Chergui, Marco Grioni, Arnaud Magrez, Michele Puppin, Helmuth Berger, Philippe Bugnon, Luca Moreschini, Alberto Crepaldi, Simon Karl Moser, Gianmarco Gatti

In nodal-line semimetals, linearly dispersing states form Dirac loops in the reciprocal space with a high degree of electron-hole symmetry and a reduced density of states near the Fermi level. The result is reduced electronic screening and enhanced correla ...

2020

Universal scattering response across the type-II Weyl semimetal phase diagram

Arnaud Magrez, Jan Hugo Dil, Helmuth Berger, Philippe Bugnon, Stefan Peter Muff, Mauro Fanciulli, Andrew Patton Weber

2018

Evidence of a Coulomb-Interaction-Induced Lifshitz Transition and Robust Hybrid Weyl Semimetal in Td−MoTe2

Arnaud Magrez, Jan Hugo Dil, Helmuth Berger, Joël Mesot, Philippe Bugnon, Kazimierz Conder

2018

Spin-Resolved Electronic Response to the Phase Transition in MoTe2

Arnaud Magrez, Jan Hugo Dil, Nan Xu, Helmuth Berger, Philippe Bugnon, Stefan Peter Muff, Mauro Fanciulli, Andrew Patton Weber

2018

Dirac nodal lines and flat-band surface state in the functional oxide RuO2

Arnaud Magrez, Helmuth Berger, Philippe Bugnon, Simon Karl Moser

The efficiency and stability of RuO2 in electrocatalysis has made this material a subject of intense fundamental and industrial interest. The surface functionality is rooted in its electronic and magnetic properties, determined by a complex interplay of la ...

AMER PHYSICAL SOC2018

Bulk diffusive relaxation mechanisms in optically excited topological insulators

Helmuth Berger, Arnaud Magrez, Alberto Crepaldi, Philippe Bugnon

The possibility to inject spin currents in topological insulators (TIs) by ultrashort optical pulses has stimulated intense studies of their out-of-equilibrium electronic properties. However, a comprehensive description of the electronic relaxation dynamic ...

Amer Physical Soc2017

Persistence of a surface state arc in the topologically trivial phase of MoTe2

Marco Grioni, Helmuth Berger, Arnaud Magrez, Oleg Yazyev, Alberto Crepaldi, Philippe Bugnon, Gabriel Albert Autes

The prediction of Weyl fermions in the low-temperature noncentrosymmetric 1T' phase of MoTe2 still awaits clear experimental confirmation. Here, we report angle-resolved photoemission (ARPES) data and ab initio calculations that reveal a surface state arc ...

Amer Physical Soc2017