Widely Tunable Berry Curvature in the Magnetic Semimetal Cr1+δTe2
Source abstract
Abstract
Abstract 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.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: 2D Materials and Applications · Topological Materials and Phenomena · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Quantum Materials Science Unit Okinawa Institute of Science and Technology (OIST) Okinawa 904‐0495 Japan
Department of Physics National Sun Yat‐sen University Kaohsiung 80424 Taiwan
Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan
Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
Center for Theoretical and Computational Physics National Sun Yat‐sen University Kaohsiung 80424 Taiwan
Institute of High Performance Computing Agency for Science Technology and Research Singapore 138632 Singapore
Department of Physics and Astronomy University of New Hampshire Durham NH 03824 USA
Materials Science Program University of New Hampshire Durham NH 03824 USA
Department of Physics National University of Singapore Singapore 117551 Singapore
Institute of Materials Research and Engineering Agency for Science Technology and Research Singapore 138634 Singapore
Funding
Core Research for Evolutional Science and Technology · Basic Energy Sciences · U.S. Department of Energy
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