Tunable Berry curvature and transport crossover in topological Dirac semimetal KZnBi

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Topological Dirac semimetals have emerged as a platform to engineer Berry curvature with time-reversal symmetry breaking, which allows to access diverse quantum states in a single material system. It is of interest to realize such diversity in Dirac semimetals that provides insight on correlation between Berry curvature and quantum transport phenomena. Here, we report the transition between anomalous Hall and chiral fermion states in three-dimensional topological Dirac semimetal KZnBi, which is demonstrated by tuning the direction and flux of Berry curvature. Angle-dependent magneto-transport measurements show that both anomalous Hall resistance and positive magnetoresistance are maximized at 0 degrees between net Berry curvature and rotational axis. We find that the unexpected crossover of anomalous Hall resistance and negative magnetoresistance suddenly occurs when the angle reaches to similar to 70 degrees, indicating that Berry curvature strongly correlates with quantum transports of Dirac and chiral fermions. It would be interesting to tune Berry curvature within other quantum phases such as topological superconductivity.
Publisher
NATURE PORTFOLIO
Issue Date
2021-09
Language
English
Article Type
Article
Citation

NPJ QUANTUM MATERIALS, v.6, no.1

ISSN
2397-4648
DOI
10.1038/s41535-021-00378-7
URI
http://hdl.handle.net/10203/287903
Appears in Collection
PH-Journal Papers(저널논문)
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