Researchers have discovered pulsations of sound and light in two-dimensional materials for the first time

Using an ultrafast transmission electron microscope, researchers from Israel

Institute of Technology Technion for the first time recorded the propagation of combined sound and light waves in atomically thin materials.

Experiments were carried out in the laboratoryelectron beam quantum dynamics. Single-layer materials, also known as two-dimensional materials, are new in themselves, consisting of a single layer of atoms. Now, scientists at the Technion have shown for the first time how pulses of light travel within these materials. Their results appeared in the journal Science.

Light travels through space at a speed of 300thousand km / s Passing through water or glass, it slows down for a fraction of a second. But when passing through some solid bodies with several layers, light slows down almost a thousand times. This is because light causes the atoms of these special materials to vibrate, creating sound waves (also known as phonons), and these atomic sound waves vibrate to create light.

Scientists were shining in pulses along the edge of the two-dimensionalmaterial, creating hybrid sound and light waves in it. Not only were they able to record these waves, but they found that the impulses can spontaneously accelerate and decelerate. These waves even split into two separate impulses moving at different speeds.

“Unlike other methods, our new techniqueallows you to get an image of the movement of light without disturbing it. Our results could not be achieved with existing methods. Thus, in addition to our scientific findings, we present a previously unseen measurement technique that will have implications for many other scientific discoveries, ”the researchers added.

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