Eric Kleinherbers
Materials with stable magnetic order host spin-wave excitations that offer a promising platform for charge-free, coherent spin transport with low dissipation. Going beyond this paradigm, we explore materials whose magnetic order is energetically unstable in equilibrium but can be dynamically stabilized by external spin torques. This nonequilibrium stabilization introduces new knobs for engineering magnon transport. As a first example, we propose hyperbolic magnets, in which the resulting magnon band structure naturally leads to self-collimation of spin waves. As a second example, we consider color centers weakly coupled to such dynamically stabilized magnets. By breaking spin rotational symmetries, the color centers spontaneously radiate magnons in the steady state. This can be used to dissipatively imprint magnetic correlations from the environment onto the color centers, for example, in the form of entanglement.