Non-Hermitian physics in magnetic systems

Non-Hermitian Hamiltonians provide an alternative perspective on the dynamics of quantum and classical systems coupled non-conservatively to environment. Once primarily interest mathematical physicists, theory non-Hermitian has solidified expanded describe various physically observable phenomena in optical, photonic, condensed matter systems. Self-consistent descriptions mechanics based have been developed continue be refined. In particular, frameworks magnonic hybrid gained popularity utility recent years with new insights into magnon topology, transport properties, phase transitions coming view. Magnonic are many ways a natural platform which realize physics because they always surrounding environment exhibit lossy dynamics. this Perspective, we review progress systems, such as cavity magnon–qubit coupling schemes. We discuss understanding inherently magnetic well gain induced by externally applied spin currents. enumerate observed both purely can understood through lens physics, [Formula: see text] anti-[Formula: text]-symmetry breaking, dynamical transitions, skin effect, realization exceptional points surfaces. Finally, comment some open problems field areas for further exploration.