Scientists take first snapshots of ultrafast switching in quantum electronic device

SLAC
They discover a short-lived state that could lead to faster and more energy-efficient computing devices.

Electronic circuits that compute and store information contain millions of tiny switches that control the flow of electric current. A deeper understanding of how these tiny switches work could help researchers push the frontiers of modern computing.

Now scientists have made the first snapshots of atoms moving inside one of those switches as it turns on and off. Among other things, they discovered a short-lived state within the switch that might someday be exploited for faster and more energy-efficient computing devices.

The research team from the Department of Energy’s SLAC National Accelerator Laboratory, Stanford University, Hewlett Packard Labs, Penn State University and Purdue University described their work in a paper published in Science today.

“This research is a breakthrough in ultrafast technology and science,” says SLAC scientist and collaborator Xijie Wang. “It marks the first time that researchers used ultrafast electron diffraction, which can detect tiny atomic movements in a material by scattering a powerful beam of electrons off a sample, to observe an electronic device as it operates.”

Capturing the cycle

For this experiment, the team custom-designed miniature electronic switches made of vanadium dioxide, a prototypical quantum material whose ability to change back and forth between insulating and electrically conducting states near room temperature could be harnessed as a switch for future computing. The material also has applications in brain-inspired computing because of its ability to create electronic pulses that mimic the neural impulses fired in the human brain.

The researchers used electrical pulses to toggle these switches back and forth between the insulating and conducting states while taking snapshots that showed subtle changes in the arrangement of their atoms over billionths of a second. Those snapshots, taken with SLAC’s ultrafast electron diffraction camera, MeV-UED, were strung together to create a molecular movie of the atomic motions.

ultrafast switching animation

The team used electrical pulses (blue squiggles) to toggle custom-made switches back and forth between insulating and conducting states, and took snapshots of subtle changes in the arrangement of their atoms with electron pulses (white) from SLAC’s ultrafast electron diffraction source, MeV-UED. Those snapshots were strung together into a molecular movie that revealed changes taking place over billionths of a second. (Greg Stewart/SLAC National Accelerator Laboratory)

“This ultrafast camera can actually look inside a material and take snapshots of how its atoms move in response to a sharp pulse of electrical excitation,” said collaborator Aaron Lindenberg, an investigator with the Stanford Institute for Materials and Energy Sciences (SIMES) at SLAC and a professor in the Department of Materials Science and Engineering at Stanford University. “At the same time, it also measures how the electronic properties of that material change over time.”

With this camera, the team discovered a new, intermediate state within the material. It is created when the material responds to an electric pulse by switching from the insulating to the conducting state.

ultrafast switching states

The material used in this research has been known to exist in two forms: the conducting state, which conducts electricity, and the insulating state, which does not. Under natural conditions, the two states have slightly different atomic arrangements and it takes energy to go from one to the other. The researchers found that when shocked electrically, these materials enter a transient conducting state in which they go from electrically insulating to conducting without changes to the atomic arrangement. (Greg Stewart/SLAC National Accelerator Laboratory)

“The insulating and conducting states have slightly different atomic arrangements, and it usually takes energy to go from one to the other,” said SLAC scientist and collaborator Xiaozhe Shen. “But when the transition takes place through this intermediate state, the switch can take place without any changes to the atomic arrangement.”

Opening a window on atomic motion

Although the intermediate state exists for only a few millionths of a second, it is stabilized by defects in the material.

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