Recherche

Afficher tous les résultats pour

Accueil

Personne

Oleg Yazyev

Cette personne a quitté l’EPFL

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (147)

Page 5 sur 8

Gadolinium(III) ion in liquid water: structure, dynamics and magnetic interactions from first principles

Lothar Helm, Oleg Yazyev

We applied first principles molecular dynamics (MD) technique to study structure, dynamics, and magnetic interactions of the

Gd^{3+}

aqua ion dissolved in liquid water, a prototypical system for Gd-based complexes used as contrast agents for magnetic res ...

2007

Exchange Interactions Mediated by Nonmagnetic Cations in Double Perovskites

Henrik Moodysson Rønnow, Oleg Yazyev, Peter Babkevich, Sami Juhani Vasala, Vamshi Mohan Katukuri

Establishing the physical mechanism governing exchange interactions is fundamental for exploring exotic phases such as quantum spin liquids in real materials. In this Letter, we address exchange interactions in Sr2CuTexW1-xO6, a series of double perovskite ...

AMER PHYSICAL SOC2020

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

Magnetic correlations at graphene edges: Basis for novel spintronics devices

Oleg Yazyev

Magnetic zigzag edges of graphene are considered as a basis for novel spintronics devices despite the fact that no true long-range magnetic order is possible in one dimension. We study the transverse and longitudinal fluctuations of magnetic moments at zig ...

2008

Optically switched magnetism in photovoltaic perovskite CH3NH3(Mn:Pb)I-3

László Forró, Oleg Yazyev, Bálint Náfrádi, Endre Horvath, Alla Arakcheeva, Massimo Spina, Péter Szirmai

The demand for ever-increasing density of information storage and speed of manipulation boosts an intense search for new magnetic materials and novel ways of controlling the magnetic bit. Here, we report the synthesis of a ferromagnetic photovoltaic CH3NH3 ...

Nature Publishing Group2016

Quantum electronic transport across 'bite' defects in graphene nanoribbons

Oleg Yazyev, Michele Pizzochero, Kristians Cernevics

On-surface synthesis has recently emerged as an effective route towards the atomically precise fabrication of graphene nanoribbons (GNRs) of controlled topologies and widths. However, whether and to what degree structural disorder occurs in the resulting s ...

IOP PUBLISHING LTD2021

Intercalant-mediated Kitaev exchange in Ag3LiIr2O6

Oleg Yazyev, Ravi Yadav

The recently synthesized Ag3LiIr2O6 has been proposed as a Kitaev magnet in proximity to the quantum spin liquid phase. We explore its microscopic Hamiltonian and magnetic ground state using many-body quantum chemistry methods and exact diagonalization tec ...

AMER PHYSICAL SOC2022

Nuclear Spin Relaxation Parameters of MRI Contrast Agents – Insight from Quantum Mechanical Calculations

Lothar Helm, Oleg Yazyev

Nuclear magnetic relaxation in the presence of paramagnetic centres has gained increasing interest in recent years partly due to its importance for contrast agents in magnetic resonance imaging. Rational design of new more efficient agents is possible as a ...

Wiley-Blackwell2008

Linear and quadratic magnetoresistance in the semimetal SiP2

Oleg Yazyev, Quansheng Wu, Shengnan Zhang

Multiple mechanisms for extremely large magnetoresistance (XMR) found in many topologically nontrivial/trivial semimetals have been theoretically proposed, but experimentally it is unclear which mechanism is responsible in a particular sample. In this pape ...

AMER PHYSICAL SOC2020

Template Nanowires for Spintronics Applications: Nanomagnet Microwave Resonators Functioning in Zero Applied Magnetic Field

Jean-Philippe Ansermet, Oleg Yazyev

Low-cost spintronic devices functioning in zero applied magnetic field are required for bringing the idea of spin-based electronics into the real-world industrial applications. Here we present first microwave measurements performed on nanomagnet devices fa ...

American Chemical Society (ACS)2008

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

Nature of native atomic defects in ZrTe5 and their impact on the low-energy electronic structure

Helmuth Berger, Oleg Yazyev, Ana Akrap, Shengnan Zhang

Over the past decades, investigations of the anomalous low-energy electronic properties of ZrTe5 have reached a wide array of conclusions. An open question is the growth method's impact on the stoichiometry of ZrTe5 samples, especially given the very small ...

AMER PHYSICAL SOC2020

Electronic Properties of Transferable Atomically Thin MoSe2/h-BN Heterostructures Grown on Rh(111)

Andras Kis, Oleg Yazyev, Michele Pizzochero, Olivier Renault, Hokwon Kim, Ming-Wei Chen

2018

Optically induced changes in the band structure of the Weyl charge-density-wave compound (TaSe4)(2)I

Majed Chergui, Helmuth Berger, Marco Grioni, Oleg Yazyev, Alberto Crepaldi, Michele Puppin, Daniel Gosalbez Martinez

Collective modes are responsible for the emergence of novel quantum phases in topological materials. In the quasi-one dimensional (1D) Weyl semimetal (TaSe4)(2)I < i , a charge density wave (CDW) opens band gaps at the Weyl points, thus turning the system ...

2022

Probing magnetism in atomically thin semiconducting PtSe2

Andras Kis, Oleg Yazyev, Ahmet Avsar, Michele Pizzochero, Alberto Ciarrocchi, Mukesh Kumar Tripathi, Cheol Yeon Cheon

Atomic-scale disorder in two-dimensional transition metal dichalcogenides is often accompanied by local magnetic moments, which can conceivably induce long-range magnetic ordering into intrinsically non-magnetic materials. Here, we demonstrate the signatur ...

Nature Research2020

Quasiparticle effects in the bulk and surface-state bands of Bi2Se3 and Bi2Te3 topological insulators

Oleg Yazyev

We investigate the bulk band structures and the surface states of Bi2Se3 and Bi2Te3 topological insulators using first-principles many-body perturbation theory based on the GW approximation. The quasiparticle self-energy corrections introduce significant c ...

2012

Fate of the non-Hermitian skin effect in many-body fermionic systems

Oleg Yazyev, Loïc Jean Pierre Herviou, Marta Agnieszka Brzezinska

We revisit the fate of the skin modes in many-body non-Hermitian fermionic systems. Contrary to the single-particle case, the many-body ground state cannot exhibit an exponential localization of all eigenstates due to the Pauli exclusion principle. However ...

AMER PHYSICAL SOC2022

Comment on graphene nanoflakes with large spin: Broken-symmetry states

Oleg Yazyev, Efthimios Kaxiras, Sheng Meng

American Chemical Society (ACS)2008

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

Magnetic Excitations and Electronic Interactions in Sr2CuTeO6: A Spin-1/2 Square Lattice Heisenberg Antiferromagnet

Henrik Moodysson Rønnow, Oleg Yazyev, Peter Babkevich, Vamshi Mohan Katukuri

Sr2CuTeO6 presents an opportunity for exploring low-dimensional magnetism on a square lattice of S = 1/2 Cu2+ ions. We employ ab initio multireference configuration interaction calculations to unravel the Cu2+ electronic structure and to evaluate exchange ...

2016