Tunable spin–charge conversion in class-I topological Dirac semimetals

We theoretically demonstrate that class-I topological Dirac semimetals (TDSMs) can provide a platform for realizing both electrically and magnetically tunable spin–charge conversion. With time-reversal symmetry, the spin component along uniaxial rotation axis ( z axis) is approximately conserved, which leads to an anisotropic Hall effect; resulting current relies on relative orientation between external electric field axis. The application of magnetic field, other hand, breaks driving TDSM into Weyl semimetal phase and, consequently, partially converting charge current. Using Kubo formulas, we numerically evaluate conductivities based low-energy Hamiltonian together with Zeeman coupling. Besides conventional tensor element conductivity [Formula: see text], find unconventional components, such as text] also exist vary rotated. Likewise, exhibits appreciable tunability upon variation field. show tunability—as well large conversion efficiency—arises from interplay symmetry band topology TDSMs.