Publications de Shengnan Zhang

Reply to: Low-frequency quantum oscillations in LaRhIn5: Dirac point or nodal line?

Oleg Yazyev, Quansheng Wu, Shengnan Zhang, Philip Johannes Walter Moll, Matthias Carsten Putzke, Chunyu Guo, Amelia Emily-Kay Estry

Nature Portfolio2023

Giant Chern number of a Weyl nodal surface without upper limit

Oleg Yazyev, Quansheng Wu, Shengnan Zhang

Weyl nodes can be classified into zero-dimensional (0D) Weyl points, 1D Weyl nodal lines, and 2D Weyl nodal surfaces (WNS), which possess finite Chern numbers. Up to date, the largest Chern number of WPs identified in Weyl semimetals is 4, which is thought ...

AMER PHYSICAL SOC2022

Temperature dependence of quantum oscillations from non-parabolic dispersions

Oleg Yazyev, Quansheng Wu, Shengnan Zhang, Matthias Carsten Putzke, Chunyu Guo, Amelia Emily-Kay Estry

A versatile methodology to detect topological quasiparticles by transport measurements remains an open problem. Here, the authors propose and experimentally observe the temperature dependence of the quantum oscillation frequency as a signature of non-trivi ...

Nature Portfolio2021

Extremely large magnetoresistance in the "ordinary" metal ReO3

Oleg Yazyev, Quansheng Wu, Shengnan Zhang, Huancheng Chen

The extremely large magnetoresistance (XMR) observed in many topologically nontrivial and trivial semimetals has attracted much attention in relation to its underlying physical mechanism. In this paper, by combining the band structure and Fermi surface (FS ...

AMER PHYSICAL SOC2021

Origin of large magnetoresistance in the topological nonsymmorphic semimetal TaSe3

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

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

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

Unidirectional Kondo scattering in layered NbS2

László Forró, Oleg Yazyev, Christoph Koch, Quansheng Wu, Shengnan Zhang, Helmuth Berger, Philip Johannes Walter Moll, Matthias Carsten Putzke, Edoardo Martino, Konstantin Semeniuk

Crystalline defects can modify quantum interactions in solids, causing unintuitive, even favourable, properties such as quantum Hall effect or superconducting vortex pinning. Here we present another example of this notion-an unexpected unidirectional Kondo ...

NATURE PORTFOLIO2021

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

Oleg Yazyev, Helmuth Berger, Shengnan Zhang, Ana Akrap

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

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

Linear and quadratic magnetoresistance in the semimetal SiP2

Oleg Yazyev, Quansheng Wu, Shengnan Zhang, Huancheng Chen

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