Publication
Active Acoustic Su-Schrieffer-Heeger-Like Metamaterial
Publications associées (34)
Controlling the Quantum Spin Hall Edge States in Two-Dimensional Transition Metal Dichalcogenides
Two-dimensional transition metal dichalcogenides (TMDs) of Mo and W in their 1T' crystalline phase host the quantum spin Hall (QSH) insulator phase. We address the electronic properties of the QSH edge states by means of first-principles calculations perfo ...
AMER CHEMICAL SOC2020Topological Fermi-arc surface resonances in bcc iron
Oleg Yazyev, Daniel Gosalbez Martinez, Gabriel Albert Autes
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 SOC2020Experimental observation of the acoustic Z2 Weyl semimetallic phase in synthetic dimensions
Romain Christophe Rémy Fleury, Farzad Zangeneh Nejad
Scalar waves such as airborne sound lack an intrinsic spin degree of freedom, making the realization of sonic Z2 topological phases based on spin degeneracy challenging. Here, we demonstrate the relevance of synthetic dimensions and higher-dimensional topo ...
2020Emergent dual topology in the three-dimensional Kane-Mele Pt2HgSe3
Nicola Marzari, Marco Gibertini, Antimo Marrazzo
Recently, the very first large-gap Kane-Mele quantum spin Hall insulator was predicted to be monolayer jacutingaite (Pt2HgSe3), a naturally occurring exfoliable mineral discovered in Brazil in 2008. The stacking of quantum spin Hall monolayers into a van-d ...
AMER PHYSICAL SOC2020Fast and ultrafast electron microscopies for skyrmions and plasmonics
In recent years, topology gained a central role in physics. We learnt that energetics could be often explained better by classes of objects defined by having qualitative differences. In today's jargon, we say they are topologically distinct. The process of ...
EPFL2019Relative Abundance of Z(2) Topological Order in Exfoliable Two-Dimensional Insulators
Nicola Marzari, Marco Gibertini, Davide Campi, Nicolas Frank Mounet, Antimo Marrazzo
Quantum spin Hall insulators make up a class of two-dimensional materials with a finite electronic band gap in the bulk and gapless helical edge states. In the presence of time-reversal symmetry, Z(2) topological order distinguishes the topological phase f ...
AMER CHEMICAL SOC2019Magnetoresistance from Fermi surface topology
Oleg Yazyev, Quansheng Wu, Shengnan Zhang
Extremely large nonsaturating magnetoresistance has recently been reported for a large number of both topologically trivial and nontrivial materials. Different mechanisms have been proposed to explain the observed magnetotransport properties, yet without a ...
2019Non-Abelian band topology in noninteracting metals
Electron energy bands of crystalline solids generically exhibit degeneracies called band-structure nodes. Here, we introduce non-Abelian topological charges that characterize line nodes inside the momentum space of crystalline metals with space-time invers ...
AMER ASSOC ADVANCEMENT SCIENCE2019Nonlinear Second-Order Topological Insulators
Romain Christophe Rémy Fleury, Farzad Zangeneh Nejad
We demonstrate, both theoretically and experimentally, the concept of nonlinear second-order topological insulators, a class of bulk insulators with quantized Wannier centers and a bulk polarization directly controlled by the level of nonlinearity. We show ...
2019Electronic Structure and Topology of Novel Materials
The ground and excited electronic states are responsible for several materials' properties. The modern capability of rapidly solving on a computer the fundamental equations of relativistic or semi-relativistic quantum mechanics allows to compute the electr ...
EPFL2019