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° 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 ~70°, 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.

拓扑狄拉克半金属已成为设计具有时间反转对称性破坏的 Berry 曲率的平台，允许在单一材料系统中访问不同的量子态。在 Dirac 半金属中实现这种多样性是很有趣的，它提供了对 Berry 曲率和量子传输现象之间相关性的深入了解。在这里，我们报告了三维拓扑狄拉克半金属 KZnBi 中异常霍尔和手性费米子态之间的转变，这通过调整 Berry 曲率的方向和通量来证明。角度相关的磁传输测量表明，异常霍尔电阻和正磁阻在净贝瑞曲率和旋转轴之间的 0° 处最大化。我们发现当角度达到~70°时，异常霍尔电阻和负磁阻的意外交叉突然发生，表明贝里曲率与狄拉克和手性费米子的量子传输密切相关。在其他量子相（例如拓扑超导）中调整 Berry 曲率会很有趣。