scholarly journals Weyl semimetal with broken time reversal and inversion symmetries

2012 ◽  
Vol 85 (16) ◽  
Author(s):  
A. A. Zyuzin ◽  
Si Wu ◽  
A. A. Burkov
Keyword(s):  
Time Reversal ◽  
Weyl Semimetal ◽  
And Inversion

scholarly journals Signatures of a time-reversal symmetric Weyl semimetal with only four Weyl points

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Ilya Belopolski ◽  
Peng Yu ◽  
Daniel S. Sanchez ◽  
Yukiaki Ishida ◽  
Tay-Rong Chang ◽  
...  
Keyword(s):  
Time Reversal ◽  
Weyl Semimetal

scholarly journals Nontrivial Berry phase in magnetic BaMnSb2 semimetal

2017 ◽  
Vol 114 (24) ◽  
pp. 6256-6261 ◽  
Author(s):  
Silu Huang ◽  
Jisun Kim ◽  
W. A. Shelton ◽  
E. W. Plummer ◽  
Rongying Jin
Keyword(s):  
Time Reversal ◽  
Berry Phase ◽  
High Mobility ◽  
Type I ◽  
Topological Superconductors ◽  
Weyl Semimetal ◽  
Antiferromagnetic Ordering ◽  
Ferromagnetic Ordering ◽  
2D And 3D ◽  
Weyl Fermions

The subject of topological materials has attracted immense attention in condensed-matter physics because they host new quantum states of matter containing Dirac, Majorana, or Weyl fermions. Although Majorana fermions can only exist on the surface of topological superconductors, Dirac and Weyl fermions can be realized in both 2D and 3D materials. The latter are semimetals with Dirac/Weyl cones either not tilted (type I) or tilted (type II). Although both Dirac and Weyl fermions have massless nature with the nontrivial Berry phase, the formation of Weyl fermions in 3D semimetals require either time-reversal or inversion symmetry breaking to lift degeneracy at Dirac points. Here we demonstrate experimentally that canted antiferromagnetic BaMnSb2 is a 3D Weyl semimetal with a 2D electronic structure. The Shubnikov–de Hass oscillations of the magnetoresistance give nearly zero effective mass with high mobility and the nontrivial Berry phase. The ordered magnetic arrangement (ferromagnetic ordering in the ab plane and antiferromagnetic ordering along the c axis below 286 K) breaks the time-reversal symmetry, thus offering us an ideal platform to study magnetic Weyl fermions in a centrosymmetric material.

scholarly journals Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2

Science ◽  
2019 ◽  
Vol 365 (6459) ◽  
pp. 1286-1291 ◽  
Author(s):  
Noam Morali ◽  
Rajib Batabyal ◽  
Pranab Kumar Nag ◽  
Enke Liu ◽  
Qiunan Xu ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Time Reversal ◽  
Surface States ◽  
Time Reversal Symmetry ◽  
Fermi Arc ◽  
Weyl Semimetal ◽  
Fermi Arcs ◽  
Bulk Surface ◽  
Weyl Semimetals ◽  
Node Connectivity

Bulk–surface correspondence in Weyl semimetals ensures the formation of topological “Fermi arc” surface bands whose existence is guaranteed by bulk Weyl nodes. By investigating three distinct surface terminations of the ferromagnetic semimetal Co3Sn2S2, we verify spectroscopically its classification as a time-reversal symmetry-broken Weyl semimetal. We show that the distinct surface potentials imposed by three different terminations modify the Fermi-arc contour and Weyl node connectivity. On the tin (Sn) surface, we identify intra–Brillouin zone Weyl node connectivity of Fermi arcs, whereas on cobalt (Co) termination, the connectivity is across adjacent Brillouin zones. On the sulfur (S) surface, Fermi arcs overlap with nontopological bulk and surface states. We thus resolve both topologically protected and nonprotected electronic properties of a Weyl semimetal.

scholarly journals Rotation of the magnetic vortex lattice in Ru7B3 driven by the effects of broken time-reversal and inversion symmetry

2019 ◽  
Vol 100 (2) ◽  
Author(s):  
A. S. Cameron ◽  
Y. S. Yerin ◽  
Y. V. Tymoshenko ◽  
P. Y. Portnichenko ◽  
A. S. Sukhanov ◽  
...  
Keyword(s):  
Time Reversal ◽  
Vortex Lattice ◽  
Magnetic Vortex ◽  
Inversion Symmetry ◽  
And Inversion
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