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Recently, higher-order topological matter and 3D quantum Hall effects haveattracted great attention. The Fermi-arc mechanism of the 3D quantum Halleffect proposed in Weyl semimetals is characterized by the one-sided hingestates, which do not exist in all the previous quantum Hall systems and moreimportantly pose a realistic example of the higher-order topological matter.The experimental effort so far is in the Dirac semimetal Cd$_3$As$_2$, wherehowever time-reversal symmetry leads to hinge states on both sides of thetop/bottom surfaces, instead of the aspired one-sided hinge states. We proposethat under a tilted magnetic field, the hinge states in Cd$_3$As$_2$-like Diracsemimetals can be one-sided, highly tunable by field direction and Fermienergy, and robust against weak disorder. Furthermore, we propose a scanningtunneling Hall measurement to detect the one-sided hinge states. Our resultswill be insightful for exploring not only the quantum Hall effects beyond twodimensions, but also other higher-order topological insulators in the future.

Field-Tunable One-Sided Higher-Order Topological Hinge States in Dirac Semimetals