A research team has successfully controlled and timed electric current pulses at an attosecond (10⁻¹⁸ seconds) timescale using a scanning tunneling microscope (STM). This breakthrough marks the first time electric current has been manipulated with such temporal precision in an STM, opening new avenues for studying ultrafast electronic phenomena and developing electronic devices at unprecedented speeds. The technique combines the atomic spatial resolution of the STM with the temporal resolution of ultrafast optics, overcoming the limitations of traditional methods.

The experiment relied on exciting the STM tip with ultrashort laser pulses, which generated current transients in the tunneling junction. By controlling the phase of these light pulses, scientists were able to modulate the current with attosecond precision. This control was achieved by manipulating the dynamics of electrons in the STM tip, allowing for synchronized charge injection and extraction with the laser's electric field. The ability to observe and manipulate these ultrafast processes is crucial for understanding the fundamental physics of light-matter interaction at extreme temporal scales.

This achievement has profound implications for materials science and nanotechnology. The ability to time and control currents at the attosecond scale could enable the development of new electronic devices operating at petahertz (10¹⁵ Hz) frequencies, far exceeding the current limits of semiconductor-based electronics. Furthermore, this technique offers a unique tool for investigating electron dynamics in materials at the atomic level, potentially leading to the discovery of new quantum phenomena and the improvement of existing technologies such as quantum computing and optoelectronics.