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[Fizinfo] Monday 14:15: Andreas Schnyder on symmetry-enforced band topologies

Chronological Thread 
  • From: Andras Palyi <palyi AT>
  • Subject: [Fizinfo] Monday 14:15: Andreas Schnyder on symmetry-enforced band topologies
  • Date: Fri, 28 May 2021 12:49:48 +0200

Dear Colleagues,

Next Monday the BME Exotic Quantum Phases seminar continues with this online

Andreas Schnyder (Max Planck Institute for Solid State Research,
Symmetry-enforced band topologies in metals and magnets

online in Teams
Time: May 31, Monday, 14:15
Abstract: see below.

Teams link:

< AT thread.tacv2/1622198577856?context={%22Tid%22:%226a3548ab-7570-4271-91a8-58da00697029%22,%22Oid%22:%22f8b27e90-dbca-4bb5-813c-d6415577ec35%22}>

Best regards,
Andras Palyi

= = =

In this talk, I will survey recent developments regarding the topological
classification of symmetry-enforced band topologies in (semi)metals and
magnets. These topological properties of the band structure are enforced to
exist by symmetry alone, independent of the band dispersion, orbital content,
and chemical composition of the material [1]. Hence, once the space group
symmetries that enforce the desired band topologies have been identified, a
suitable material can be found simply by browsing materials databases by
space group numbers [2-4]. In this way, we have identified, among others
[2-5], the topological materials ZrIrSn [2] and ferromagnetic MnSi [5], which
will be discuss in detail.

The material ZrIrSn exhibits Weyl nodal lines near the Fermi energy, whose
existence is guaranteed by a glide mirror symmetry. The topology of this
nodal line is characterized by a quantized Pi-Berry phase, which leads to
drumhead surface states. Ferromagnetic MnSi, on the other hand, has
topological nodal planes on the BZ boundary, which are enforced by a
combination of time-reversal with screw rotation symmetries. These nodal
planes are sources of Berry flux, which is absorbed by single Weyl points at
the center of the BZ. We discuss experimental consequences of these nodal
planes in the surface spectra and de Haas-van Alphen measurements [5].

[1] Y. Zhao, A. Schnyder, Phys. Rev. B 94, 195109 (2016)
[2] J. Zhang, Y. Chan, C. Chiu, M. Vergniory, L. Schoop, A. Schnyder, Phys.
Rev. Materials 2, 074201 (2018)
[3] Y. Chan, B. Kilic, M. Hirschmann, C. Chiu, L. Schoop, D. Joshi, A.
Schnyder, Phys. Rev. Materials 3, 124204 (2019)
[4] M. Hirschmann, A. Leonhardt, B. Kilic, D. Fabini, A. Schnyder,
[5] M. Wilde, M. Dodenhöft, A. Niedermayr, A. Bauer, C. Pfleiderer, to appear
in Nature

  • [Fizinfo] Monday 14:15: Andreas Schnyder on symmetry-enforced band topologies, Andras Palyi, 05/28/2021

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