Coulomb Drag in Altermagnets

Abstract

An altermagnet is a newly discovered antiferromagnet, characterized by unique anisotropic spin-split energy bands. It has attracted tremendous interest, because of its promising potential in information storage and processing. However, measuring the distinctive spin-split energy bands arising from altermagnetism remains a challenge. Here, we propose to employ the Coulomb drag to probe altermagnetism. In the Coulomb drag, an electric current in an active layer of electron gases can induce currents in a close but well-isolated passive layer, due to interlayer Coulomb interactions. We find that the Coulomb drag effects in altermagnets are highly sensitive to the orientation of the spin-split Fermi surfaces. As a result, transverse currents can be dragged in the passive layer, leading to Hall drag effects even in absence of spin-orbit coupling, a feature quite different from all previous systems. More importantly, all the drag effects of altermagnets have unique angle dependence, which can be measured in a multi-terminal setup to serve as signatures for altermagnetism. This proposal will inspire increasing explorations on emergent magnetism.

5+2 pages, 4 figures, 1 table

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• Symmetry Classification for Alternating Excitons in Two-Dimensional Altermagnets
• Nonlinear Piezomagnetic Effects in $g$-wave Altermagnets
• Two-Dimensional Altermagnetic Iron Oxyhalides: Real Chern Topology and Valley-Spin-Lattice Coupling
• Josephson current signature of Floquet Majorana and topological accidental zero modes in altermagnet heterostructures
• Quantum Lifshitz points in an altermagnetic metal
• Néel vector controlled exceptional contours in $p$-wave magnet-ferromagnet junctions
• Beyond the Drude model: surface and non-local effects in near-field radiative heat transfer and the Casimir puzzle
• Magnetic-field-tuned randomness in inhomogeneous altermagnets
• Spin-Polarized Josephson Supercurrent in Nodeless Altermagnets
• Viscoelastic tensor and hydrodynamics of altermagnets
• $d$-Wave Polarization-Spin Locking in Two-Dimensional Altermagnets
• Finite-momentum mixed singlet-triplet pairing in chiral antiferromagnets induced by even-parity spin texture
• X-ray magnetic circular dichroism originating from the $T_z$ term in collinear altermagnets under trigonal crystal field
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• Topological superconductivity and superconducting diode effect mediated via unconventional magnet and Ising spin-orbit coupling
• Antiferroaxial altermagnetism