Tuning the nontrivial topological properties of the Weyl semimetal CeAlSi

Abstract

In the ferromagnetic Weyl semimetal CeAlSi both space-inversion and time-reversal symmetries are broken. We use external pressure as an effective tuning parameter and relate three observations to the presence of a nontrivial topology in its ferromagnetic regime: an exceptional temperature response of the quantum oscillations amplitude, the presence of an anomalous Hall effect (AHE), and the existence of an unusual loop Hall effect (LHE). We find a suppression of the AHE and the LHE with increasing pressure, while the Curie temperature is enhanced. The magnetic structure and the electronic bands exhibit only a negligible pressure effect suggesting the importance of the domain wall landscape for the topological behavior in CeAlSi.

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Cited by in corpus (15)

• Kramers nodal lines and Weyl fermions in SmAlSi
• Stripe Helical Magnetism and Two Regimes of Anomalous Hall Effect in NdAlGe
• Topological Hall effect in CeAlGe
• Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals $R$AlSi ($R$=La, Ce, Pr, Nd, Sm)
• Anomalous Hall effect with plateaus observed in a magnetic Weyl semimetal NdAlGe at low temperatures
• Pressure tuning of intrinsic and extrinsic sources to the anomalous Hall effect in CrGeTe${}_3$
• Activation of anomalous Hall effect and orbital magnetization by domain walls in altermagnets
• Rich unconventional Hall effects in a single quasi-kagome Kondo Weyl semimetal candidate Ce${}_3$TiSb${}_5$
• Topological Hall effect enhanced at magnetic transition fields in a frustrated magnet EuCd${}_2$
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Large circular photogalvanic effect in the noncentrosymmetric magnetic Weyl semimetal CeAlSi
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Crystalline electric field excitations in Weyl semimetal \textit{R}AlSi (\textit{R} = Ce, Pr and Nd)
• Isotropic Dirac fermion and anomalous oscillator strength of zeroth Landau level transition
• Incommensurate magnetic order drives singular angular magnetoresistance in a Weyl semimetal