Magnetism-induced topological transition in EuAs3

Abstract

The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead to a variety of novel physics. We systematically studied the magnetic semimetal EuAs3, demonstrating a magnetism-induced topological transition from a topological nodal-line semimetal in the paramagnetic or the spin-polarized state to a topological massive Dirac metal in the antiferromagnetic ground state at low temperature. The topological nature in the antiferromagnetic state and the spin-polarized state has been verified by electrical transport measurements. An unsaturated and extremely large magnetoresistance of ~2 × 105% at 1.8 K and 28.3 T is observed. In the paramagnetic states, the topological nodal-line structure at the Y point is proven by angle-resolved photoemission spectroscopy. Moreover, a temperature-induced Lifshitz transition accompanied by the emergence of a new band below 3 K is revealed. These results indicate that magnetic EuAs3 provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology.

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

“…The intricate relationship between magnetism and topology continues to be complex, yet holds promise for unlocking new and exotic topological states. Hitherto research on this interplay is limited to a few cases, for example, a magnetic field-induced ideal type-II Weyl state in Mn(Bi 1-x Sb x ) 2 Te 4 23 , 24 , a magnetic-exchange-induced Weyl state in EuCd 2 Sb 2 25 , a spin-fluctuation-induced Weyl semimetal state in EuCd 2 As 2 17 , 26 , a magnetism-induced topological transition in EuAs 3 27 , and magnetization-tunable Weyl states in EuB 6 28 , etc. To exploit more novel phenomena and elaborate the relationship, more systems are called for.…”

Second‐Order Topological Insulator in Ferromagnetic Monolayer and Antiferromagnetic Bilayer CrSBr

“…The intricate interplay between magnetism and topology has substantially enriched our understanding of various exotic quantum phenomena, including the quantum anomalous Hall effect, [18][19][20] fully spin-polarized topological semimetals, [21][22][23][24] and axion TIs. [25][26][27][28] However, it is worth noting that the pool of materials capable of realizing high-order topological phases remains quite limited.…”