scholarly journals Intrinsic nonreciprocal reflection and violation of Kirchhoff's law of radiation in planar type-I magnetic Weyl semimetal surfaces

2020 ◽  
Vol 102 (16) ◽  
Author(s):  
Simo Pajovic ◽  
Yoichiro Tsurimaki ◽  
Xin Qian ◽  
Gang Chen
Keyword(s):  
Type I ◽  
Weyl Semimetal ◽  
Kirchhoff's Law

scholarly journals Colossal mid-infrared bulk photovoltaic effect in a type-I Weyl semimetal

2019 ◽  
Vol 18 (5) ◽  
pp. 471-475 ◽  
Author(s):  
Gavin B. Osterhoudt ◽  
Laura K. Diebel ◽  
Mason J. Gray ◽  
Xu Yang ◽  
John Stanco ◽  
...  
Keyword(s):  
Photovoltaic Effect ◽  
Type I ◽  
Mid Infrared ◽  
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 Ternary compound HfCuP: An excellent Weyl semimetal with the coexistence of type-I and type-II Weyl nodes

2020 ◽  
Vol 24 ◽  
pp. 523-528 ◽  
Author(s):  
Weizhen Meng ◽  
Xiaoming Zhang ◽  
Tingli He ◽  
Lei Jin ◽  
Xuefang Dai ◽  
...  
Keyword(s):  
Ternary Compound ◽  
Type I ◽  
Type Ii ◽  
Weyl Semimetal

scholarly journals A type of robust superlattice type-I Weyl semimetal with four Weyl nodes

Nanoscale ◽  
2019 ◽  
Vol 11 (39) ◽  
pp. 18358-18366 ◽  
Author(s):  
Lijun Meng ◽  
Jiafang Wu ◽  
Jianxin Zhong ◽  
Rudolf A. Römer
Keyword(s):  
First Principles ◽  
Tight Binding ◽  
Type I ◽  
Topological Properties ◽  
Weyl Semimetal

We investigate the topological properties of the Janus superlattices WTeS and WTeSe by first-principles methods and Wannier-based tight-binding Hamiltonians.

Two-dimensional Weyl semimetal with coexisting fully spin-polarized type-I and type-II Weyl points

2021 ◽  
Vol 540 ◽  
pp. 148318
Author(s):  
Weizhen Meng ◽  
Xiaoming Zhang ◽  
Ying Liu ◽  
Liying Wang ◽  
Xuefang Dai ◽  
...  
Keyword(s):  
Type I ◽  
Type Ii ◽  
Two Dimensional ◽  
Weyl Semimetal ◽  
Spin Polarized

scholarly journals Artificial event horizons in Weyl semimetal heterostructures and their non-equilibrium signatures

2021 ◽  
Vol 11 (5) ◽  
Author(s):  
Christophe De Beule ◽  
Solofo Groenendijk ◽  
Tobias Meng ◽  
Thomas Schmidt
Keyword(s):  
Scattering Problem ◽  
Normal Incidence ◽  
Differential Conductance ◽  
Type I ◽  
Type Ii ◽  
White Hole ◽  
Event Horizons ◽  
Weyl Semimetal ◽  
Low Energies ◽  
Non Equilibrium

We investigate transport in type-I/type-II Weyl semimetal heterostructures that realize effective black- or white-hole event horizons. We provide an exact solution to the scattering problem at normal incidence and low energies, both for a sharp and a slowly-varying Weyl cone tilt profile. In the latter case, we find two channels with transmission amplitudes analog to those of Hawking radiation. Whereas the Hawking-like signatures of these two channels cancel in equilibrium, we demonstrate that one can favor the contribution of either channel using a non-equilibrium state, either by irradiating the type-II region or by coupling it to a magnetic lead. This in turn gives rise to a peak in the two-terminal differential conductance which can serve as an experimental indicator of the artificial event horizon.

scholarly journals Near-complete violation of Kirchhoff’s law in thermal radiation in ultrathin magnetic Weyl semimetal films

2021 ◽  
Author(s):  
Jun Wu ◽  
Zhong Wang ◽  
Han Zhai ◽  
Zhangxing Shi ◽  
Xiaohu Wu ◽  
...  
Keyword(s):  
Thermal Radiation ◽  
Weyl Semimetal ◽  
Kirchhoff's Law

scholarly journals Thermo-Magneto-Electric Transport through a Torsion Dislocation in a Type I Weyl Semimetal

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2972
Author(s):  
Daniel Bonilla ◽  
Enrique Muñoz ◽  
Rodrigo Soto-Garrido
Keyword(s):  
Magnetic Field ◽  
Lattice Mismatch ◽  
Transport Coefficients ◽  
Type I ◽  
Electric Transport ◽  
Torsional Strain ◽  
Weyl Semimetal ◽  
Dislocation Defect ◽  
Valley Polarization ◽  
Large Figure

Herein, we study electronic and thermoelectric transport in a type I Weyl semimetal nanojunction, with a torsional dislocation defect, in the presence of an external magnetic field parallel to the dislocation axis. The defect is modeled in a cylindrical geometry, as a combination of a gauge field accounting for torsional strain and a delta-potential barrier for the lattice mismatch effect. In the Landauer formalism, we find that due to the combination of strain and magnetic field, the electric current exhibits chiral valley-polarization, and the conductance displays the signature of Landau levels. We also compute the thermal transport coefficients, where a high thermopower and a large figure of merit are predicted for the junction.

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