Valley-dependent electronic properties in two-dimensional altermagnetic iron-based transition metal chalcogenides
arXiv:2512.11711 · doi:10.1103/7q2y-v4sz
Abstract
Altermagnets represent a newly identified third class of collinear magnets and have recently emerged as a focal point in condensed matter physics. In this work, through first-principles calculations and theoretical analysis, we identify monolayer FeMoX (X = S, Se, Te) and FeWTe, a class of iron-based transition metal chalcogenides, as promising altermagnetic materials. These systems are found to be semiconductors exhibiting spin splitting in their nonrelativistic band structures, indicative of intrinsic altermagnetic ordering. Remarkably, their valence bands feature a pair of valleys at the time-reversal-invariant momenta X and Y points. Unlike conventional valley systems, these valleys are related by crystal symmetries rather than time-reversal symmetry. We investigate valley-dependent physical phenomena in these materials, including Berry curvature and optical circular dichroism, revealing strong valley-contrasting behavior. Furthermore, we investigate the effect of uniaxial strain and show that it effectively lifts the valley degeneracy, resulting in pronounced valley polarization. Under hole doping, this strain-induced asymmetry gives rise to a piezomagnetic response. We also explore the generation of anisotropic noncollinear spin currents in these systems, expanding the scope of their spin-related functionalities. Our findings unveil rich valley physics in monolayer FeMoX (X = S, Se, Te) and FeWTe, highlighting their significant potential for applications in valleytronics, spintronics, and multifunctional nanoelectronic devices.
10 pages, 7 figures
References in corpus (47)
- Berry Phase Effects on Electronic Properties
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- Control of valley polarization in monolayer MoS2 by optical helicity
- Valley polarization in MoS2 monolayers by optical pumping
- MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
- Valley contrasting physics in graphene: magnetic moment and topological transport
- Maximally-localized Wannier functions for entangled energy bands
- Valley filter and valley valve in graphene
- Valley Dependent Optoelectronics from Inversion Symmetry Breaking
- Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
- Magnetic Control of Valley Pseudospin in Monolayer WSe2
- Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
- Breaking of valley degeneracy by magnetic field in monolayer MoSe2
- Observation of the Anomalous Hall Effect in a Collinear Antiferromagnet
- Efficient Electrical Spin-Splitter Based on Non-Relativistic Collinear Antiferromagnetism
- Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
- Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
- Observation of spin splitting torque in a collinear antiferromagnet RuO2
- Giant and tunneling magnetoresistance effects from anisotropic and valley-dependent spin-momentum interactions in antiferromagnets
- Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
- Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor
- Giant and tunable valley degeneracy splitting in MoTe2
- Observation of spin-splitter torque in collinear antiferromagnetic RuO
- Antiferromagnetism in RuO as -wave Pomeranchuk instability
- Valley susceptibility of an interacting two-dimensional electron system
- BoltzWann: A code for the evaluation of thermoelectric and electronic transport properties with a maximally-localized Wannier functions basis
- Itinerant Antiferromagnetism in RuO
- Observation of plaid-like spin splitting in a noncoplanar antiferromagnet
- Large band-splitting in -wave type altermagnet CrSb
- Discovery of a metallic room-temperature d-wave altermagnet KV2Se2O
- Anomalous Antiferromagnetism in Metallic RuO Determined by Resonant X-ray Scattering
- Topological Superconductivity in Two-Dimensional Altermagnetic Metals
- Antiferroelectric Altermagnets: Antiferroelectricity Alters Magnets
- Enumeration and representation theory of spin space groups
- Ferroelectric switchable altermagnetism
- Magnetic control of the valley degree of freedom of massive Dirac fermions with application to transition metal dichalcogenides
- Three-dimensional mapping of the altermagnetic spin splitting in CrSb
- Predictable gate-field control of spin in altermagnets with spin-layer coupling
- Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet
- Spin Space Groups: Full Classification and Applications
- Enumeration of spin-space groups: Towards a complete description of symmetries of magnetic orders
- Majorana corner modes and tunable patterns in an altermagnet heterostructure
- Zeeman splitting via spin-valley-layer coupling in bilayer MoTe2
- Circular dichroism of emergent chiral stacking orders in quasi-one-dimensional charge density waves
- Topological Weyl Altermagnetism in CrSb
- Observation of surface Fermi arcs in altermagnetic Weyl semimetal CrSb
- Strain-induced valley polarization, topological states, and piezomagnetism in two-dimensional altermagnetic VTeO, VSTeO, VSSeO, and VSO
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