Coupling the valley degree of freedom to antiferromagnetic order

Abstract

Conventional electronics are based invariably on the intrinsic degrees of freedom of an electron, namely, its charge and spin. The exploration of novel electronic degrees of freedom has important implications in both basic quantum physics and advanced information technology. Valley as a new electronic degree of freedom has received considerable attention in recent years. In this paper, we develop the theory of spin and valley physics of an antiferromagnetic honeycomb lattice. We show that by coupling the valley degree of freedom to antiferromagnetic order, there is an emergent electronic degree of freedom characterized by the product of spin and valley indices, which leads to spin-valley dependent optical selection rule and Berry curvature-induced topological quantum transport. These properties will enable optical polarization in the spin-valley space, and electrical detection/manipulation through the induced spin, valley and charge fluxes. The domain walls of an antiferromagnetic honeycomb lattice harbors valley-protected edge states that support spin-dependent transport. Finally, we employ first principles calculations to show that the proposed optoelectronic properties can be realized in antiferromagnetic manganese chalcogenophosphates (MnPX_3, X = S, Se) in monolayer form.

6 pages, 5 figures

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• Electric Field Effect in Atomically Thin Carbon Films
• Two Dimensional Atomic Crystals
• Valley polarization in MoS2 monolayers by optical pumping
• Valley filter and valley valve in graphene
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• Quantum spin-liquid emerging in two-dimensional correlated Dirac fermions
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• Magnetoelectric MnPS3 thiophosphate as a new candidate for ferrotoroidicity
• Valley Polarization in Si(100) at Zero Magnetic Field
• Integer quantum Hall effect on a six valley hydrogen-passivated silicon (111) surface

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• Exciton band structure of monolayer MoS2
• Spin-Valleytronics in Silicene: Quantum-Spin-Quantum-Anomalous Hall Insulators and Single-Valley Semimetals
• Imaging the Néel vector switching in the monolayer antiferromagnet MnPSe${}_3$ with strain-controlled Ising order
• Gate-controllable magneto-optic Kerr effect in layered collinear antiferromagnets
• Linear magneto-electric phase in ultrathin MnPS${}_3$ probed by optical second harmonic generation
• Toroidal order in metals without local inversion symmetry
• Isolation and Characterization of Few-layer Manganese Thiophosphite
• Sign-reversible valley-dependent Berry phase effects in 2D valley-half-semiconductors
• Electronic, magnetic and optical properties of MnPX${}_3$ (X = S, Se) monolayers with and without chalcogen defects: A first-principle study
• Topological Dirac states beyond $\pi$ orbitals for silicene on SiC(0001) surface
• Emergent spin-valley-orbital physics by spontaneous parity breaking
• Spontaneous Parity Breaking in Spin-Orbital Coupled Systems
• Tuning the magnetic anisotropy and topological phase with electronic correlation in single-layer H-FeBr${}_2$
• Magnetoelastic interaction in the two-dimensional magnetic material MnPS${}_3$ studied by first principles calculations and Raman experiments
• Emergent odd-parity multipoles and magnetoelectric effects on a diamond structure: implication to 5$d$ transition metal oxides $A$OsO${}_4$ ($A=$ K, Rb, and Cs)
• Tunable valley and spin splittings in $\mathrm{VS}{\mathrm{i}}_2{\mathrm{N}}_4$ bilayer
• Spin photogalvanic effect in two-dimensional collinear antiferromagnets
• Protected valley states and generation of valley- and spin-polarized current in monolayer MA2Z4
• Antiferromagnetic Topological Superconductor and Electrically Controllable Majorana Fermions
• Observation of giant surface second harmonic generation coupled to nematic orders in the van der Waals antiferromagnet FePS${}_3$
• Optically reconfigurable quantum spin-valley Hall effect of light in coupled nonlinear ring resonator lattice
• Proximity effects in graphene on monolayers of transition-metal phosphorus trichalcogenides MPX${}_3$
• Detecting the Néel vector of altermagnet by attaching a topological insulator and crystalline valley-edge insulator
• Pressure-Induced Insulator-to-Metal Transition in van der Waals compound CoPS${}_3$
• Dimensional crossover in a layered ferromagnet detected by spin correlation driven distortions
• Spontaneous valley polarization in 2D organometallic lattice
• Valley contrasting bulk photovoltaic effect in antiferromagnetic MnPSe${}_3$ monolayer
• Anharmonic stabilization of ferrielectricity in CuInP${}_2$Se${}_6$
• Spin-crossover induced ferromagnetism and layer stacking-order change in pressurized 2D antiferromagnet MnPS${}_3$
• Quantum Valley Hall effect without Berry curvature
• Optical Selection Rules in Spin-Orbit Coupled Systems on Honeycomb Lattice
• Reversal of Orbital Hall Conductivity and Emergence of Tunable Topological Quantum States in Orbital Hall Insulator
• Layer Control of Magneto-Optical Effects and Their Quantization in Spin-Valley Splitting Antiferromagnets
• To the synthesis and characterization of layered metal phosphorus triselenides proposed for electrochemical sensing and energy applications
• Pressure-induced insulator-metal transition in two-dimensional Mott insulator NiPS3
• Optimizing Topological Switching in Confined 2D-Xene Nanoribbons via Finite-Size Effects
• Spin liquid in twisted homobilayers group-VI gichalcogenides
• Gate-controlled valley transport and Goos-Hänchen effect in monolayer WS${}_2$
• Switchable Giant Bulk Photocurrents and Photo-spin-currents in Monolayer PT-symmetric Anti-ferromagnet MnPSe3
• Half-integer anomalous currents in 2D materials from a QFT viewpoint
• Valley and spin splittings in a valley-layer-locked monolayer via atomic adsorption
• Quantum geometry and elliptic optical dichroism in $p$-wave magnets
• Ferroelectric Antiferromagnetic Lifting of Spin-Valley Degeneracy
• Anomalous valley Hall effect in monolayer chromium-based triple-Q magnets
• Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
• Exploring the interfacial coupling between graphene and the antiferromagnetic insulator MnPSe${}_3$
• Band-spin-valley coupled exciton physics in antiferromagnetic MnPS${}_3$
• Dimensional Crossover Tuned by Pressure in Layered Magnetic NiPS3
• Reversing Neel Vector in PT-Antiferromagnets by Nonreciprocal Light Scattering
• Electric-field-enhanced second-harmonic domain contrast and nonreciprocity in a van der Waals antiferromagnet
• Multiple types of spin textures and robust valley physics in MP${}_2$X${}_6$
• Analysis of Spin Current Generation by Elastic Waves in $f$-wave Altermagnets
• Emerging nonlinear Hall effect in Kane-Mele two-dimensional topological insulators
• Intrinsic Valley-Related Multiple Hall Effect in 2D Organometallic Lattice