A driven-dissipative altermagnetic magnon bath generates an extended LLG equation with two spatially nonlocal anisotropic damping terms, one non-Markovian, for controlling classical spin dynamics in AMI/FI bilayers.
Quantum effects in the magnon spectrum of 2D altermagnets via continuous similarity transformations
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abstract
We investigate quantum effects on magnon excitations in a minimal spin-1/2 Heisenberg model for 2D altermagnets on the square lattice. A continuous similarity transformation is applied in momentum space to derive an effective Hamiltonian that conserves the number of magnon excitations. This allows us to quantitatively calculate the one-magnon dispersion, the effects of magnon-magnon interactions, and the dynamic structure factor in a certain range of parameters. In particular, we focus on the altermagnetic spin splitting of the magnon bands and the size of the roton minimum. We further map out divergencies of the continuous similarity transformation for different types of generators, which signal either the breakdown of the N\'eel-ordered phase or the presence of significant magnon decay.
years
2026 2representative citing papers
Checkerboard-lattice Hubbard electrons are unstable to weak-coupling altermagnetism whose magnons display alternating chirality splitting.
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Engineering a driven-dissipative bath of altermagnetic quantum magnons for controlling classical dynamics of spins hosting spin waves, domain walls, or skyrmions
A driven-dissipative altermagnetic magnon bath generates an extended LLG equation with two spatially nonlocal anisotropic damping terms, one non-Markovian, for controlling classical spin dynamics in AMI/FI bilayers.
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Weak-coupling altermagnetism and chiral magnetic excitations in a checkerboard lattice
Checkerboard-lattice Hubbard electrons are unstable to weak-coupling altermagnetism whose magnons display alternating chirality splitting.