Terahertz rectification in ring-shaped quantum barriers.

摘要: Tunneling is the most fundamental quantum mechanical phenomenon with wide-ranging applications. Matter waves such as electrons in solids can tunnel through a one-dimensional potential barrier, e.g. an insulating layer sandwiched between conductors. A general approach to control tunneling currents apply voltage across barrier. Here, we form closed loops of barriers exposed external optical manipulate ultrafast electrons. Eddy induced by incoming electromagnetic pulses project upon ring, spatiotemporally changing local potential. The total current which determined sum contributions from all parts along perimeter critically dependent symmetry loop and polarization incident fields, enabling full-wave rectification terahertz pulses. By introducing global geometry operation current-driven circuitry, our work provides novel platform for optoelectronics, macroscopic phenomena, energy harvesting, multi-functional devices.