Publications related to Experimental Observation and Spin Texture of Dirac Node Arcs in Tetradymite Topological Metals

“Methodological Criss-Crossing”: A Mixed Methods Ethnography of a Digital Library

At the crossroads of the ethnography of scholarly practices and digital humanities, this study proposes to consider the exploratory aspect of the scientific activity as an intellectual path through a corpus made accessible by an online platform. My case st ...

2022

Bounds on photon scattering

Denis Karateev, Kelian Philippe Häring, Marco Meineri, Aditya Hebbar

We study 2-to-2 scattering amplitudes of massless spin one particles in

d=4

space-time dimensions, like real world photons. We define a set of non-perturbative observables (Wilson coefficients) which describe these amplitudes at low energies. We use full ...

2022

Observation of a singular Weyl point surrounded by charged nodal walls in PtGa

Oleg Yazyev, Jan Hugo Dil, Quansheng Wu, Shengnan Zhang

Constrained by the Nielsen-Ninomiya no-go theorem, in all so-far experimentally determined Weyl semimetals (WSMs) the Weyl points (WPs) always appear in pairs in the momentum space with no exception. As a consequence, Fermi arcs occur on surfaces which con ...

NATURE RESEARCH2021

Superior robustness of anomalous non-reciprocal topological edge states

Romain Christophe Rémy Fleury, Zhechen Zhang, Pierre Delplace

Robustness against disorder and defects is a pivotal advantage of topological systems, manifested by the absence of electronic backscattering in the quantum-Hall and spin-Hall effects, and by unidirectional waveguiding in their classical analogues. Two-dim ...

2021

Topological Linear System Identification via Moderate Deviations Theory

Daniel Kuhn, Wouter Jongeneel, Tobias Sutter

Two dynamical systems are topologically equivalent when their phase-portraits can be morphed into each other by a homeomorphic coordinate transformation on the state space. The induced equivalence classes capture qualitative properties such as stability or ...

2021

Hermitian formulation of multiple scattering induced topological phases in metamaterial crystals

Romain Christophe Rémy Fleury, Nadège Sihame Kaïna

In this article we develop an analog to the SSH model in tight-binding chains of resonators and an innovative Hermitian matrix formulation to describe the topological phases induced by multiple scattering at subwavelength scales in one-dimensional structur ...

2020

Oxidation States, Thouless' Pumps, and Nontrivial Ionic Transport in Nonstoichiometric Electrolytes

Federico Grasselli

Thouless' quantization of adiabatic particle transport permits one to associate an integer topological charge with each atom of an electronically gapped material. If these charges are additive and independent of atomic positions, they provide a rigorous de ...

2020

Experimental studies of the equilibrium and out-of-equilibrium electronic structure of non-symmorphic topological materials

Gianmarco Gatti

Symmetry and topology are fundamental properties of nature. Mathematics provides us with a general framework to understand these concepts. On one side, symmetry describes the invariance properties of an object for specific transformations. On the other sid ...

EPFL2020

Large magnetoresistance and nonzero Berry phase in the nodal-line semimetal MoO2

Oleg Yazyev, Quansheng Wu, Shengnan Zhang, Huancheng Chen

We performed calculations of the electronic band structure and the Fermi surface as well as measured the longitudinal resistivity rho(xx)(T,H), Hall resistivity rho(xy)(T,H), and quantum oscillations of the magnetization as a function of temperature at var ...

2020

Non-Abelian reciprocal braiding of Weyl points and its manifestation in ZrTe

Oleg Yazyev, Quansheng Wu

Weyl points in three-dimensional systems with certain symmetry carry non-Abelian topological charges, which can be transformed via non-trivial phase factors that arise upon braiding these points inside the reciprocal space. Weyl semimetals in three-dimensi ...

NATURE PUBLISHING GROUP2020

Experimental Observation and Spin Texture of Dirac Node Arcs in Tetradymite Topological Metals

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“Methodological Criss-Crossing”: A Mixed Methods Ethnography of a Digital Library

Bounds on photon scattering

Observation of a singular Weyl point surrounded by charged nodal walls in PtGa

Superior robustness of anomalous non-reciprocal topological edge states

Topological Linear System Identification via Moderate Deviations Theory

Hermitian formulation of multiple scattering induced topological phases in metamaterial crystals

Oxidation States, Thouless' Pumps, and Nontrivial Ionic Transport in Nonstoichiometric Electrolytes

Experimental studies of the equilibrium and out-of-equilibrium electronic structure of non-symmorphic topological materials

Large magnetoresistance and nonzero Berry phase in the nodal-line semimetal MoO2

Non-Abelian reciprocal braiding of Weyl points and its manifestation in ZrTe

“Methodological Criss-Crossing”: A Mixed Methods Ethnography of a Digital Library

Superior robustness of anomalous non-reciprocal topological edge states

Large magnetoresistance and nonzero Berry phase in the nodal-line semimetal MoO2

Topological Linear System Identification via Moderate Deviations Theory

Experimental studies of the equilibrium and out-of-equilibrium electronic structure of non-symmorphic topological materials

Non-Abelian reciprocal braiding of Weyl points and its manifestation in ZrTe

Observation of a singular Weyl point surrounded by charged nodal walls in PtGa

Oxidation States, Thouless' Pumps, and Nontrivial Ionic Transport in Nonstoichiometric Electrolytes

Bounds on photon scattering

Hermitian formulation of multiple scattering induced topological phases in metamaterial crystals