Altermagnetism in Two Dimensional Ca${}_2$RuO${}_4$ Perovskite

Abstract

We propose and characterize a novel two-dimensional material, 2D-CRO, derived from bulk calcium-based ruthenates (CROs) of the Ruddlesden-Popper family, Ca${}_{n+1}$Ru${}_n$O${}_{3n+1}$ ($n=1$ and $2$). Using density functional theory, we demonstrate that 2D-CRO maintains structural stability down to the monolayer limit, exhibiting a tight interplay between structural and electronic properties. Notably, 2D-CRO displays altermagnetic behavior, characterized by zero net magnetization and strong spin-dependent phenomena, stabilized through dimensionality reduction. This stability is achieved by breaking inversion symmetry along the z-axis, favoring altermagnetic properties even in the absence of van der Waals interactions. Through theoretical models and computational analysis, we explore the altermagnetic behavior of 2D-CRO, both with and without spin-orbit coupling. We identify the spin components that contribute to the altermagnetic character and highlight the potential of 2D-CRO as a promising material for investigating altermagnetic phenomena and topological features.

22 pages, 23 figures

References in corpus (19)

• Restoring the density-gradient expansion for exchange in solids and surfaces
• Generalized gradient approximation for solids and their surfaces
• Necessary and Sufficient Elastic Stability Conditions in Various Crystal Systems
• Engineering symmetry breaking in two-dimensional layered materials
• Observation of Giant Band Splitting in Altermagnetic MnTe
• Twisted Magnetic Van der Waals Bilayers: An Ideal Platform for Altermagnetism
• Altermagnetism with Non-collinear Spins
• Circular dichroism of emergent chiral stacking orders in quasi-one-dimensional charge density waves
• Intrinsic Layer-Polarized Anomalous Hall Effect in Bilayer MnBi2Te4
• Remarkably enhanced Curie temperature in monolayer CrI3 by hydrogen and oxygen adsorption: A first-principles calculations
• Altermagnetic surface states: towards the observation and utilization of altermagnetism in thin films, interfaces and topological materials
• Orbital-selective altermagnetism and correlation-enhanced spin-splitting in transition metal oxides
• Tailoring the electronic properties of Ca${}_2$RuO${}_4$ via epitaxial strain
• Coupling charge and topological reconstructions at polar oxide interfaces
• Electronic Structure and Band Gap Engineering of Two-Dimensional Octagon-Nitrogene
• Cooperative Interactions Govern the Fermiology of the Polar Metal Ca${}_3$Ru${}_2$O${}_7$
• Induced Monolayer Altermagnetism in MnP(S,Se)${}_3$ and FeSe
• Altermagnetic multiferroics and altermagnetoelectric effect
• Structural Properties of Two-Dimensional Strontium Titanate: A First-Principles Investigation

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• Conditions for orbital selective altermagnetism in Sr${}_2$RuO${}_4$: tight binding model, similarities with cuprates and implications on superconductivity
• Engineering Altermagnetism via Layer Shifts and Spin Order in Bilayer MnPS${}_3$
• Unlocking Doping Effects on Altermagnetism in MnTe: Emergence of Quasi-altermagnetism
• Relativistic spin-momentum locking in ferromagnets
• Quantum-impurity sensing of altermagnetic order