UNIST Researchers Elucidate Quantum Pump Mechanism Using Helical Nanowires

Korean researchers have theoretically revealed the principle behind helical nanowires acting as 'quantum pumps,' presenting a new way to implement the 'charge pumping' process that consistently moves electrons in a single direction.

A team led by Professor Park No-jeong at UNIST has demonstrated that one-dimensional helical materials function as 'topological charge pumps,' a process accompanied by the physical phenomena of 'orbital angular momentum' and 'spin polarization.' This research shows that, unlike conventional quantum mechanical methods, charge can be efficiently transported under a simple condition of rotating the electric field direction by just one full turn. The research team analyzed electron states over time using models of helical hydrocarbons and trigonal selenium nanowires.

Professor Park No-jeong stated that this research is the first to reveal the interconnectedness of topological charge pumping, orbital angular momentum, and spin polarization within chiral nanowires as a unified mechanism. The study is expected to lay the groundwork for new methodologies in topologically controlling electron, orbital, and spin properties in future nanoelectronic devices.