Researchers reveal the origin of ultrafast mystery signals in valleytronic materials

By exciting the transitional metal dichalcogenide monolayers—atomically thin semiconductors—with ultrashort pump pulses, atoms can coherently vibrate and modulate optical responses. The probe pulses can detect the ultrafast modulation that shows peculiar high-frequency overtones of K-point acoustic phonons. Credit: Yokohama National University Tiny materials hold big mysteries, the solutions to which could bring about next-generation electronics. … Read more