Israeli and German Scientists Control Graphene Electrons With Lasers
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Scientists from Israel's Technion and Germany have demonstrated a method to control electrons in graphene using laser flashes. By applying two precisely timed laser pulses, researchers can alter graphene's properties and direct electron movement. This breakthrough, published in Nature Physics, could lead to new light-controlled electronic devices. The findings suggest potential applications in faster electronics, sensors, and communication systems.
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- Technion and German scientists can now control graphene electrons using laser pulses.
- The method involves altering graphene's properties with light, a state called "dressed in light."
- Electron movement is controlled by the polarization and timing of laser flashes.
- The research, published in Nature Physics, confirms theoretical predictions.
- This could lead to faster, more energy-efficient electronic components and sensors.
Researchers from Israel's Technion and their German colleagues have successfully manipulated the behavior of electrons in graphene using laser pulses. Graphene, a single-atom-thick sheet of carbon known for its strength, transparency, and conductivity, has long been a target for scientists seeking to control its electrons with light rather than electric current. The breakthrough, achieved by a team led by Ofer Neufeld at the Technion, was published in the journal Nature Physics. The experiment involves directing a brief, intense laser flash at the graphene. This light, an oscillating electric field, excites the electrons, causing them to behave as if they are in a different material with altered properties for the duration of the flash, a state the researchers describe as the material being "dressed in light." Immediately after the initial flash, a second laser pulse is applied to measure the resulting current. The direction of the light's polarization, whether clockwise or counterclockwise, was found to influence the direction of the electron flow. By precisely controlling the polarization and the timing between the laser pulses, the scientists can actively steer the electrons. This experimental work validates theoretical predictions that light can temporarily alter material properties and, crucially, demonstrates the ability to actively control electrons in this light-induced state. Neufeld stated that the findings extend beyond graphene, potentially paving the way for faster, more energy-efficient electronic components, communication systems, sensors, and computing devices whose properties can be switched on and off with light.
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