Magnetic Weyl & Spin-Orbit Transport

Figure 3 from the CeAlSi paper: band structure, density of states, Weyl nodes, magnetic tuning, and anomalous Hall conductivity.

Source: Fig. 3, H.-Y. Yang et al., Physical Review B 103, 115143 (2021).

Noncollinear Ferromagnetic Weyl Semimetal with Anisotropic Anomalous Hall Effect

Hung-Yu Yang, Bahadur Singh, Jonathan Gaudet, Baozhu Lu, Cheng-Yi Huang, Wei-Chi Chiu, et al.

Physical Review B 103, 115143 (2021).

CeAlSi establishes a distinct class of ferromagnetic Weyl semimetal in which broken inversion symmetry stabilizes the Weyl nodes while noncollinear magnetic order tunes their positions. By combining first-principles calculations with neutron scattering and transport measurements, we connected the unusual anisotropic anomalous Hall response and loop Hall effect to the proximity of the Fermi level to the Weyl nodes and to magnetic-domain physics.

Figure 3 from the PrAlGe1-xSix paper: comparison of band structures, Fermi surfaces, and Weyl-node distributions in PrAlGe and PrAlSi.

Source: Fig. 3, H.-Y. Yang et al., APL Materials 8, 011111 (2020).

Transition from Intrinsic to Extrinsic Anomalous Hall Effect in PrAlGe₁₋ₓSiₓ

Hung-Yu Yang, Bahadur Singh, Baozhu Lu, Cheng-Yi Huang, Faranak Bahrami, Wei-Chi Chiu, et al.

APL Materials 8, 011111 (2020).

Chemical substitution in PrAlGe₁₋ₓSiₓ provides a controlled way to tune anomalous Hall transport without destroying the underlying Weyl-node structure. First-principles calculations and Hall-scaling analysis reveal a universal intrinsic contribution for x ≤ 0.5 and an extrinsic regime for x > 0.5, demonstrating how band filling and scattering mechanisms compete in ferromagnetic Weyl semimetals.

Figure 4 from the TbPtBi paper: spin-resolved bands, spin-orbit-induced anticrossings, Berry curvature, Weyl nodes, and anomalous Hall conductivity.

Source: Fig. 4, Y. Zhu et al., Physical Review B 101, 161105(R) (2020).

Exceptionally Large Anomalous Hall Effect from Spin-Split Band Anticrossings in TbPtBi

Yanglin Zhu, Bahadur Singh, Yu Wang, Cheng-Yi Huang, Wei-Chi Chiu, et al.

Physical Review B 101, 161105(R) (2020).

TbPtBi exhibits an exceptionally large anomalous Hall effect in its canted antiferromagnetic state, with an anomalous Hall angle reaching approximately 0.68–0.76. First-principles calculations show that the response is not dominated by Weyl points; instead, it originates from intense Berry curvature generated by anticrossings of spin-split bands near the Fermi level.

Source: Fig. 1, T. Hakioglu et al., Physical Review B 108, 155103 (2023).

Nonorthogonal Spin–Momentum Locking

Tugrul Hakioglu, Wei-Chi Chiu, Robert S. Markiewicz, Bahadur Singh, and Arun Bansil

Physical Review B 108, 155103 (2023). Co-first author.

We showed that spin–orbit scattering from dilute spinless impurities can rotate the spin texture away from the conventional perpendicular relation between spin and momentum. Above a characteristic coupling threshold, the resulting deflection angle provides an experimentally accessible signature in spin- and angle-resolved photoemission and affects spin-to-charge conversion and quasiparticle-interference measurements.

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