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Gabriel Albert Autes

Cette personne a quitté l’EPFL

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Publications associées (28)

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Momentum and photon energy dependence of the circular dichroic photoemission in the bulk Rashba semiconductors BiTeX (X = I, Br, Cl)

Helmuth Berger, Arnaud Magrez, Marco Grioni, Oleg Yazyev, Philippe Bugnon, Alberto Crepaldi, Luca Moreschini, Gabriel Albert Autes, Jens Christian Johannsen, Cédric Tournier-Colletta

Bulk Rashba systems BiTeX (X = I, Br, Cl) are emerging as important candidates for developing spintronics devices because of the coexistence of spin-split bulk and surface states, along with the ambipolar character of the surface charge carriers. The need ...

American Physical Society2014

BiTeCl and BiTeBr: A comparative high-pressure optical study

Helmuth Berger, Arnaud Magrez, Oleg Yazyev, Philippe Bugnon, Ana Akrap, Gabriel Albert Autes

We here report a detailed high-pressure infrared transmission study of BiTeCl and BiTeBr. We follow the evolution of two band transitions: the optical excitation beta between two Rashba-split conduction bands, and the absorption. across the band gap. In th ...

Amer Physical Soc2017

Structural and electronic properties of the Bi/Au(110)-1x4 surface

Harald Brune, Marco Grioni, Oleg Yazyev, François Patthey, Marina Pivetta, Alberto Crepaldi, Gabriel Albert Autes, Cédric Tournier-Colletta

We report on the structural and electronic properties of the Bi/Au(110)-1 x 4 surface, by combining scanning tunneling microscopy, angle-resolved photoemission spectroscopy, and first-principles calculations. The analysis of the precursor 1 x 8 moire struc ...

American Physical Society2013

Dynamic media content categorisation method

Sabine Süsstrunk, Gabriel Albert Autes, Mahmut Sami Arpa

The present invention concerns a method of classifying a media item into a user profile suitability class in a classification system comprising a set of pre-trained artificial neural networks. The method comprising: receiving (101) a media file; extracting ...

2020

Topological Fermi-arc surface resonances in bcc iron

Oleg Yazyev, Gabriel Albert Autes, Daniel Gosalbez Martinez

The topological classification of matter has been extended to include semimetallic phases characterized by the presence of topologically protected band degeneracies. In Weyl semimetals, the foundational gapless topological phase, chiral degeneracies are is ...

AMER PHYSICAL SOC2020

Giant Ambipolar Rashba Effect in the Semiconductor BiTeI

Klaus Kern, Helmuth Berger, Marco Grioni, Oleg Yazyev, Philippe Bugnon, Alberto Crepaldi, Luca Moreschini, Gabriel Albert Autes, Simon Karl Moser, Naunidh Singh Virk, Cédric Tournier-Colletta

We observe a giant spin-orbit splitting in the bulk and surface states of the noncentrosymmetric semiconductor BiTeI. We show that the Fermi level can be placed in the valence or in the conduction band by controlling the surface termination. In both cases, ...

Amer Physical Soc2012

Electronic Transport in Graphene with Aggregated Hydrogen Adatoms

Oleg Yazyev, Gabriel Albert Autes, Fernando Gargiulo, Naunidh Singh Virk

Hydrogen adatoms and other species covalently bound to graphene act as resonant scattering centers affecting the electronic transport properties and inducing Anderson localization. We show that attractive interactions between adatoms on graphene and their ...

American Physical Society2014

Engineering quantum spin Hall effect in graphene nanoribbons via edge functionalization

Oleg Yazyev, Gabriel Albert Autes

Kane and Mele predicted that in the presence of spin-orbit interaction graphene realizes the quantum spin Hall state [Phys. Rev. Lett. 95, 226801 (2005)]. However, exceptionally weak intrinsic spin-orbit splitting in graphene (approximate to 10(-5) eV) inh ...

Amer Physical Soc2013

Strong out-of-plane magnetic anisotropy of Fe adatoms on Bi2Te3

Oleg Yazyev, Gabriel Albert Autes, Artem Pulkin

The electronic and magnetic properties of individual Fe atoms adsorbed on the surface of the topological insulator Bi2Te3(111) are investigated. Scanning tunneling microscopy and spectroscopy prove the existence of two distinct types of Fe species, while o ...

American Physical Society2014

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

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

Observation of Weyl nodes and Fermi arcs in tantalum phosphide

Joël Mesot, Oleg Yazyev, Gabriel Albert Autes

A Weyl semimetal possesses spin-polarized band-crossings, called Weyl nodes, connected by topological surface arcs. The low-energy excitations near the crossing points behave the same as massless Weyl fermions, leading to exotic properties like chiral anom ...

Nature Publishing Group2016

Localized electronic states at grain boundaries on the surface of graphene and graphite

Oleg Yazyev, Gabriel Albert Autes

Recent advances in large-scale synthesis of graphene and other 2D materials have underscored the importance of local defects such as dislocations and grain boundaries (GBs), and especially their tendency to alter the electronic properties of the material. ...

Iop Publishing Ltd2016

Robust Type-II Weyl Semimetal Phase in Transition Metal Diphosphides XP2 (X = Mo, W)

Oleg Yazyev, Gabriel Albert Autes

The recently discovered type-II Weyl points appear at the boundary between electron and hole pockets. Type-II Weyl semimetals that host such points are predicted to exhibit a new type of chiral anomaly and possess thermodynamic properties very different fr ...

Amer Physical Soc2016

Electromechanical oscillations in bilayer graphene

Andras Kis, Oleg Yazyev, Gabriel Albert Autes, Fernando Gargiulo, Mohamed Malik Benameur, Sajedeh Manzeli

Nanoelectromechanical systems constitute a class of devices lying at the interface between fundamental research and technological applications. Realizing nanoelectromechanical devices based on novel materials such as graphene allows studying their mechanic ...

Nature Research2015

A novel quasi-one-dimensional topological insulator in bismuth iodide beta-Bi4I4

László Forró, Marco Grioni, Oleg Yazyev, Gabriel Albert Autes, Andrea Pisoni, Luca Moreschini, Jens Christian Johannsen

Recent progress in the field of topological states of matter(1,2) has largely been initiated by the discovery of bismuth and antimony chalcogenide bulk topological insulators (TIs; refs 3-6), followed by closely related ternary compounds(7-16) and predicti ...

Nature Publishing Group2016

Controlled growth of a line defect in graphene and implications for gate-tunable valley filtering

Oleg Yazyev, Gabriel Albert Autes, Fernando Gargiulo

Atomically precise tailoring of graphene can enable unusual transport pathways and new nanometer-scale functional devices. Here we describe a recipe for the controlled production of highly regular "5-5-8" line defects in graphene by means of simultaneous e ...

Amer Physical Soc2014

Engineering the topological surface states in the (Sb2)m−Sb2Te3(m=0–3) superlattice serie

Helmuth Berger, Arnaud Magrez, Marco Grioni, Oleg Yazyev, Philippe Bugnon, Alberto Crepaldi, Gabriel Albert Autes, Simon Karl Moser, Jens Christian Johannsen

We investigate the evolution of both the occupied and unoccupied electronic structure in representative compounds of the infinitely adaptive superlattice series (Sb2)m−Sb2Te3 (m=0–3) by means of angle-resolved photoemission spectroscopy and time-delayed tw ...

Amer Physical Soc2015

Magnetic Moment and Anisotropy of Individual Co Atoms on Graphene

Harald Brune, Oleg Yazyev, François Patthey, Pietro Gambardella, Fabio Donati, Gabriel Albert Autes, Quentin Dubout

We report on the magnetic properties of single Co atoms on graphene on Pt(111). By means of scanning tunneling microscopy spin-excitation spectroscopy, we infer a magnetic anisotropy of K = -8.1 meV with out-of-plane hard axis and a magnetic moment of 2.2 ...

American Physical Society2013

Evidence for a Strong Topological Insulator Phase in ZrTe5

Helmuth Berger, Arnaud Magrez, Oleg Yazyev, Philippe Bugnon, Alberto Crepaldi, Gabriel Albert Autes, Luca Gragnaniello

The complex electronic properties of ZrTe5 have recently stimulated in-depth investigations that assigned this material to either a topological insulator or a 3D Dirac semimetal phase. Here we report a comprehensive experimental and theoretical study of bo ...

Amer Physical Soc2016

Origin of large magnetoresistance in the topological nonsymmorphic semimetal TaSe3

Helmuth Berger, Jean-Philippe Ansermet, Oleg Yazyev, Alberto Crepaldi, Quansheng Wu, Michele Puppin, Gabriel Albert Autes, Gianmarco Gatti, Shengnan Zhang, Daniel Gosalbez Martinez

TaSe3 is a layered van der Waals semimetal with several inverted band gaps throughout the entire Brillouin zone and nontrivial Z(2) topological indices, which place it at the boundary between a strong and a weak topological phase. Our transport experiments ...

2021