Details

Autor(en) / Beteiligte

• Fujisawa, Yuita
• Pardo‐Almanza, Markel
• Hsu, Chia‐Hsiu
• Mohamed, Atwa
• Yamagami, Kohei
• Krishnadas, Anjana
• Chang, Guoqing
• Chuang, Feng‐Chuan
• Khoo, Khoong Hong
• Zang, Jiadong
• Soumyanarayanan, Anjan
• Okada, Yoshinori

Titel

Widely Tunable Berry Curvature in the Magnetic Semimetal Cr1+δTe2

Ist Teil von

• Advanced materials (Weinheim), 2023-03, Vol.35 (12), p.e2207121-n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Magnetic semimetals have increasingly emerged as lucrative platforms hosting spin‐based topological phenomena in real and momentum spaces. Cr1+δTe2 is a self‐intercalated magnetic transition metal dichalcogenide (TMD), which exhibits topological magnetism and tunable electron filling. While recent studies have explored real‐space Berry curvature effects, similar considerations of momentum‐space Berry curvature are lacking. Here, the electronic structure and transport properties of epitaxial Cr1+δTe2 thin films are systematically investigated over a range of doping, δ (0.33 – 0.71). Spectroscopic experiments reveal the presence of a characteristic semi‐metallic band region, which shows a rigid like energy shift with δ. Transport experiments show that the intrinsic component of the anomalous Hall effect (AHE) is sizable and undergoes a sign flip across δ. Finally, density functional theory calculations establish a link between the doping evolution of the band structure and AHE: the AHE sign flip is shown to emerge from the sign change of the Berry curvature, as the semi‐metallic band region crosses the Fermi energy. These findings underscore the increasing relevance of momentum‐space Berry curvature in magnetic TMDs and provide a unique platform for intertwining topological physics in real and momentum spaces. A self‐intercalated transition metal dichalcogenide Cr1+δTe2 is shown to be a unique magnetic semimetal enabling widely tunable k‐space Berry curvature near Fermi energy. The door has been opened for probing and tailoring the intertwined Berry curvature physics in real and momentum space in Cr1+δTe2 epitaxial thin films and their heterostructures.