Overview
Researchers from Friedrich Schiller University Jena and the University of Regensburg have devised a method to determine a quantum property of electrons, the Berry curvature, using light. This quantity characterizes specific geometric properties of the quantum mechanical states of electrons. The measurement was performed on a single atomic layer of the semiconductor tungsten diselenide, employing ultrashort laser pulses. These findings have been published in the journal Nature Photonics.
Research Context
The Berry curvature describes geometric properties associated with the quantum mechanical states of electrons. This particular quantum property has historically been difficult to access experimentally. The research focused on advancing techniques for its determination.
Approach
The researchers developed a method that utilizes ultrashort laser pulses to probe the Berry curvature. This technique employs light to determine the specified quantum property. The chosen material for investigation was a layer of tungsten diselenide, which was prepared as a single atomic layer.
Findings
The developed method successfully measured the Berry curvature in a one-atomic-layer thick film of the semiconductor tungsten diselenide. This indicates a new way to access this specific quantum property of electrons using light.
Why This Matters
The development of a method to determine Berry curvature using light addresses a challenge in accessing this quantum property. It offers a new pathway for investigating geometric properties of quantum mechanical electron states.