First-principles simulations of an altermagnetic/semiconductor/altermagnetic junction show generation of pure spin photocurrent tunable by photon energy and light polarization.
One-dimensional electronics with edge states in two-dimensional altermagnets
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abstract
The coupling between real-space inhomogeneities coordinates and spin (r-s) provides an alternative route to achieve efficient spin manipulation in spintronics beyond the conventional momentum-spin (k-s) coupling paradigm. Here we demonstrate an unexpected manifestation of one-dimensional (1D) r-s coupling in two-dimensional (2D) altermagnetic second-order topological insulators, where the spin-split floating edge states -- energetically isolated within the bulk band gap -- emerge and exhibit both Neel-vector-dependent and electrically tunable behaviors. The 1D edge-spin r-s coupling ensures carrier transport to be exclusively carried by the edge states with quantized spin conductance, giving rise to an unconventional edge tunnel magnetoresistance (edge-TMR) effect that can be switched On or Off. As a proof of concept, we computationally design an edge-TMR device based on Cr_2Se_2O monolayer to demonstrate its edge transportation and controllability via the N\'eel order or electric field. Our findings propose a general prototype altermagnetic device for next-generation low-dimensional spintronics.
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Theoretical analysis of topological phase transitions, Berry curvature, and edge-state hybridization in 2D d-wave altermagnets, leading to a proposed topological altermagnetic field-effect transistor.
A review that classifies two-dimensional altermagnets via spin-group theory, lists materials with large spin splitting, and outlines design strategies for experimental realization.
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Pure Spin Photocurrent in Altermagnetic Photovoltaic Battery
First-principles simulations of an altermagnetic/semiconductor/altermagnetic junction show generation of pure spin photocurrent tunable by photon energy and light polarization.
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Real and momentum space analysis of topological phases in 2D d-wave altermagnets
Theoretical analysis of topological phase transitions, Berry curvature, and edge-state hybridization in 2D d-wave altermagnets, leading to a proposed topological altermagnetic field-effect transistor.