Quantization of spin circular photogalvanic effect in altermagnetic Weyl semimetals
arXiv:2509.05620 · doi:10.1103/463y-q7lt
Abstract
We theoretically predict a spin-current analog of the quantized circular photogalvanic effect in Weyl semimetals. This phenomenon is forbidden in antiferromagnets by symmetry but uniquely allowed in altermagnets, highlighting a novel and intrinsic characteristic of altermagnetism. To systematically explore second-order spin current responses, we classify all symmetry-allowed responses based on spin point groups. Furthermore, we provide a comprehensive classification of altermagnetic Weyl semimetals by identifying spin space groups that host symmetry-enforced Weyl points. Utilizing this classification, we construct a symmetry-guided tight-binding model and confirm our predictions. Finally, we identify Weyl crossings in a material candidate via first-principle calculations. Our work unveils a distinctive optical response of altermagnets, paving the way for a new frontier in altermagnetism.
6+17 pages, 4+1 figures
References in corpus (50)
- Spintronics: Fundamentals and applications
- Spin Hall effect
- Antiferromagnetic spintronics
- Antiferromagnetic spintronics
- Universal Intrinsic Spin-Hall Effect
- Dissipationless Quantum Spin Current at Room Temperature
- Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system
- Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
- Crystal Hall effect in Collinear Antiferromagnets
- Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
- Quantized circular photogalvanic effect in Weyl semimetals
- Theory of magnon-driven spin Seebeck effect
- Observation of the Anomalous Hall Effect in a Collinear Antiferromagnet
- Topological nature of nonlinear optical effects in solids
- Efficient Electrical Spin-Splitter Based on Non-Relativistic Collinear Antiferromagnetism
- Observation of spin splitting torque in a collinear antiferromagnet RuO2
- Spin current generation in organic antiferromagnets
- Direct observation of altermagnetic band splitting in CrSb thin films
- Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor
- Observation of spin-splitter torque in collinear antiferromagnetic RuO
- Antiferromagnetism in RuO as -wave Pomeranchuk instability
- Crystal Thermal Transport in Altermagnetic RuO2
- Low-frequency divergence and quantum geometry of the bulk photovoltaic effect in topological semimetals
- Observation of the spin Nernst effect
- Topology and geometry under the nonlinear electromagnetic spotlight
- Dirac nodal lines and induced spin Hall effect in metallic rutile oxides
- X-ray Magnetic Circular Dichroism in Altermagnetic -MnTe
- The Spin Nernst effect in Tungsten
- Pure Spin Photocurrent in Non-centrosymmetric Crystals: Bulk Spin Photovoltaic Effect
- Pure spin current from one-photon absorption of linearly polarized light in noncentrosymmetric semiconductors
- Spin Nernst effect and Nernst effect in two-dimensional electron systems
- Topological aspects of nonlinear excitonic processes in noncentrosymmetric crystals
- Topological Weyl Altermagnetism in CrSb
- Weakly spin-dependent band structures of antiferromagnetic perovskite LaMO (M = Cr, Mn, Fe)
- Spin Nernst effect in the absence of a magnetic field
- PT-symmetry enabled spin circular photogalvanic effect in antiferromagnetic insulators
- Spin photogalvanic effect in two-dimensional collinear antiferromagnets
- Observation of surface Fermi arcs in altermagnetic Weyl semimetal CrSb
- Supplemental Material to "A first-principles linear response description of the spin Nernst effect"
- A first-principles linear response description of the spin Nernst effect
- Geometric aspects of nonlinear and nonequilibrium phenomena
- Quantized Integrated Shift Effect in Multigap Topological Phases
- Quasiclassical theory of superconducting spin-splitter effects and spin-filtering via altermagnets
- Spin and Orbital Magnetism by Light in Rutile Altermagnets
- Non-Abelian Hopf-Euler insulators
- Gauge-invariant projector calculus for quantum state geometry and applications to observables in crystals
- Nonlinear photoconductivities and quantum geometry of chiral multifold fermions
- The multi-state geometry of shift current and polarization
- Bulk photovoltaic effects in altermagnets
- Absence of quantization in the circular photogalvanic effect in disordered chiral Weyl semimetals