Researchers Control Electrons in Graphene Using Laser Pulses
Translated & summarized from Ynet by baba
Researchers from the Technion and Germany have successfully controlled electron movement in graphene using ultra-short laser pulses, a first-of-its-kind achievement. Published in Nature Physics, the study demonstrates how light can alter graphene's properties and induce a new quantum state, potentially leading to faster electronic components and advanced technologies. The findings provide experimental proof for theoretical concepts in quantum materials and could enable new measurement methods.
The story in 5 lines · by baba
- Researchers controlled electrons in graphene using ultra-short laser pulses for the first time.
- The breakthrough could lead to faster, more efficient electronic components and advanced technologies.
- The study demonstrated control over electrons in a non-equilibrium topological quantum state.
- Precise laser illumination temporarily altered graphene's properties, creating a "topological Flocke insulator" state.
- The research observed chiral responses in electron currents based on light polarization.
Researchers from the Technion and Germany have demonstrated for the first time how to control the movement of electrons within a quantum material using ultra-short laser pulses. The findings, published in the journal Nature Physics, show how graphene's properties can be altered by light, controlling the electron responses within it. This achievement could lead to the development of faster and more efficient electronic components, as well as advancements in communication, sensing, and computing technologies.
The lead authors of the paper are Dr. Ofer Neufeld from the Schulich Faculty of Chemistry at the Technion and the Helen Diller Quantum Center, along with his colleagues in Germany, Professor Peter Hommelhoff and Dr. Daniel Lesko. Graphene, a single layer of carbon atoms in a honeycomb structure, is known for its remarkable strength, near-total transparency, and high conductivity of electrons and light.
The study reveals that precise laser illumination can temporarily change graphene's properties, inducing a novel quantum state called a "topological Flocke insulator." This state allows for dynamic control of electron movement within the material, driven by light itself. This scientific breakthrough is significant as it marks the first demonstration of active control over electrons within a non-equilibrium topological state, providing experimental proof for recent theoretical ideas in quantum materials.
Specifically, this control enabled the researchers to observe chiral responses, where electron currents behave differently depending on the polarization of the light. By mapping these currents against the polarization and timing of the laser pulses, the team demonstrated sensitivity to the quantum state's phase, potentially paving the way for new measurement methods for non-equilibrium materials.
Dr. Neufeld, who recently returned to the Technion after postdoctoral research in Germany, stated that the research implications extend beyond graphene. He anticipates that these findings could facilitate the development of faster, more energy-efficient electronic components and light-activated communication, sensing, and computing systems. The research was supported by the German Research Foundation (DFG), the European Union's Horizon 2020 program, and the Gordon and Betty Moore Foundation.