Photon-assisted extrinsic Weyl orbits and three-dimensional quantum Hall effect in surface-doped topological Dirac semimetals

In this study, we investigate the manipulation of Weyl orbits in topological Dirac semimetals (DSMs) with surface doping using circularly polarized light (CPL). Our investigation reveals that surface impurities in topological DSMs can couple the Fermi arcs from different Weyl sectors, leading to the breakdown of intrinsic Weyl orbits. The application of CPL can effectively reduce the overlapping between the Fermi arcs, thereby restoring partial Fermi arcs of the topological DSMs. Subsequently, extrinsic Weyl orbits emerge between opposite Weyl sectors. These extrinsic Weyl orbits present an intriguing pathway to regulate the three-dimensional (3D) quantum Hall effect(QHE). The 3D QHE induced by the extrinsic Weyl orbits can be modulated through surface magnetic perturbations and light irradiation, resulting in observable quantized Hall plateaus in the parameter space of CPL. Our findings propose a promising approach for stabilizing Weyl orbits and manipulating the 3D QHE in topological semimetals.