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The noncentrosymmetric ferromagnetic Weyl semimetal CeAlSi with simultaneousspace-inversion (SI) and time-reversal (TR) symmetry breaking provides a uniqueplatform for the exploration of novel topological states. Here, by employingelectrical and thermoelectrical transport, angle-resolved photoemissionspectroscopy (ARPES), high-pressure techniques, and band calculations, wedemonstrate that magnetism and pressure can serve as efficient parameters totune the positions of Weyl nodes in CeAlSi. At ambient pressure, an anomalousHall effect (AHE) and an anomalous Nernst effect (ANE) arise in theparamagnetic state, and then are enhanced when temperature approaches theferromagnetic ordering temperature, evidencing magnetism facilitates theAHE/ANE. Such an enhancement of AHE/ANE can be ascribed to the tuning of thepositions of Weyl nodes via magnetism. The ARPES measurements reveal that theferromagnetism serves as a pivotal knob to tune the band structure of CeAlSiboth in the bulk and on the surface. Such magnetism-tunable electronicstructure has hitherto not been reported in other magnetic $R$Al$Pn$ ($R$ =rare earth elements, $Pn$ = Si, Ge) siblings, suggesting the great potential ofcontrolling Weyl node positions in CeAlSi. Under pressure, an enhancement and asign change of AHE are discovered. Based on band calculations, the evolution ofAHE may root in the tuning of Weyl nodes via pressure. Moreover, multiplepressure-induced phase transitions are uncovered. These findings indicate thatCeAlSi provides a unique and tunable platform for exploring exotic topologicalphysics and electron correlations, as well as catering to an array of potentialapplications, such as spintronics and thermoelectrics.

Tunable positions of Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi