Elementary excitations and quasi-particles within condensed matter exhibit a diverse array of physical attributes, encompassing spin and orbital angular momenta, electric dipole moments, and their respective higher-order multipoles. Over recent decades, investigations into the generation, detection, manipulation, and transportation of these quantities have developed into the interdisciplinary field known as “X-tronics”, where ‘X’ embodies a degree of freedom or informational carrier inherent to quasi-particles, such as spin, orbital, phonon, magnon, or photon.