Triplon current generation in solids

A triplon refers to a fictitious particle that carries angular momentum $S = 1$ corresponding the elementary excitation in broad class of quantum dimerized spin systems. Such systems without magnetic order have long been studied as testing ground for properties spins. Although triplons found play central role thermal and magnets with singlet correlation, flow carried by triplons, current, has not detected yet. Here we report Seebeck effects induced current: effect, using spin-Peierls system CuGeO$_3$. The result shows heating-driven transport induces current whose sign is positive, opposite spin-wave cases magnets. effect persists far below transition temperature, being consistent theoretical calculation effects.