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

Abstract

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 the uniaxial rotation axis ($z$-axis) is approximately conserved, which leads to an anisotropic spin Hall effect -- the resulting spin Hall current relies on the relative orientation between the external electric field and the $z$-axis. The application of a magnetic field, on the other hand, breaks time-reversal symmetry, driving the TDSM into a Weyl semimetal phase and, consequently, partially converting the spin current to a charge Hall current. Using the Kubo formulas, we numerically evaluate the spin and charge Hall conductivities based on a low-energy TDSM Hamiltonian together with the Zeeman coupling. Besides the conventional tensor element of the spin Hall conductivity ${\sigma }_{xy}^z$, we find that unconventional components, such as ${\sigma }_{xy}^x$ and ${\sigma }_{xy}^y$, also exist and vary as the magnetic field is rotated. Likewise, the charge Hall conductivity also exhibits appreciable tunability upon variation of the magnetic field. We show that such tunability -- as well as large spin-charge conversion efficiency -- arises from the interplay of symmetry and band topology of the TDSMs.

arXiv commentv2: 18 pages, 5 figures; version accepted for publication in APL Materials

References in corpus (45)

• Topological Insulators
• Berry Phase Effects on Electronic Properties
• Spin Hall effect
• Universal Intrinsic Spin-Hall Effect
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
• Model Hamiltonian for Topological Insulators
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Control of spin-orbit torques through crystal symmetry in WTe2/ferromagnet bilayers
• Quantum Oscillations from Surface Fermi-Arcs in Weyl and Dirac Semi-Metals
• Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
• Negative Magnetoresistance in Dirac Semimetal Cd3As2
• Anomalous Hall Effect in Weyl Metals
• Spin-pumping into surface states of topological insulator α-Sn, spin to charge conversion at room temperature
• Giant intrinsic spin Hall effect in the TaAs family of Weyl semimetals
• Quantum Materials for Spin and Charge Conversion
• Quantum Hall states observed in thin films of Dirac semimetal Cd3As2
• Dirac nodal lines and induced spin Hall effect in metallic rutile oxides
• Intrinsic Anomalous Hall Effect in Type-II Weyl Semimetals
• Intrinsic spin currents in ferromagnets
• Evolution of Weyl orbit and quantum Hall effect in Dirac semimetal Cd3As2
• Giant anisotropic magnetoresistance and planar Hall effect in the Dirac semimetal Cd3As2
• Observation of Spin Hall Effect in Weyl Semimetal WTe2 at Room Temperature
• Perspectives of Electrically generated spin currents in ferromagnetic materials
• Giant Intrinsic Spin Hall Effect in W${}_3$Ta and other A15 Superconductors
• Z_2 and Chiral Anomalies in Topological Dirac Semimetals
• Superconductivity in doped Dirac semimetals
• Gate-tuned quantum Hall states in Dirac semimetal (Cd1-xZnx)3As2
• Tunable large spin Hall and spin Nernst effects in Dirac semimetals ZrXY (X=Si, Ge; Y=S, Se, Te)
• Spin-to-charge conversion in magnetic Weyl semimetals
• Intrinsic spin Hall effect in topological insulators: A first-principles study
• Mirror Anomaly in Dirac Semimetals
• Spin and charge interconversion in Dirac semimetal thin films
• Infinite Berry Curvature of Weyl Fermi Arcs
• First principles theory of Dirac semimetal Cd${}_3$As${}_2$ under Zeeman magnetic field
• Integer Quantum Hall Effect in a Lattice Model Revisited: Kubo Formalism
• Magnetic Field Induced Weyl Semimetal from Wannier-Function-based Tight-Binding Model
• Topological surface states in strained Dirac semimetal thin films
• Spin Hall conductivity in topological Dirac semimetals
• Evidence for pressure-induced node-pair annihilation in Cd3As2
• Symmetry Analysis of Tensors in the Honeycomb Lattice of Edge-Sharing Octahedra
• Mirror anomaly and anomalous Hall effect in type-I Dirac semimetals
• Staggered spin Hall conductivity