Phonon Angular Momentum Generation in Single-Stranded Helix Structure

Abstract The experimental realization of observable phonon angular momentum (PAM) in feasible systems using relatively simple methods remains a critical challenge. Motivated by the chiral-induced spin selectivity effect, this study explores the generation of PAM during the transport of electrically driven polarons along a single-stranded helix structure. We demonstrate that the motion of a polaron under an applied electric field inherently induces a finite PAM, exhibiting drift-locked behavior between the PAM and the polaron. By analyzing the time evolution of PAM distribution at each site, we identify the observed PAM as a natural consequence of coherent superposition between lattice waves, in which the chiral structure selectively determines the direction of induced PAM. Furthermore, we examine the roles of two types of electron–phonon interactions and structural periodicity in modulating PAM. These findings highlight the potential of chiral molecules as platforms for PAM generation and offer new insights into developing phonon-spin-based devices for information processing and transmission.