Nanowerk November 8, 2021
Previously an international team of researchers (Germany, Russia, USA – Arizona State University, Japan)Â reported that a layer of the semiconductor material molybdenum diselenide generated laser light at cryogenic temperatures. Now they created the same effect at room temperature in exciton-polaritons. If sufficient exciton-polaritons are generated, they merge into a macroscopic quantum state. A sudden increase in light emission from the sample indicates that this transformation has taken place. The resulting radiation has only a single wavelength and displays coherence. To demonstrate the effect, they placed thin layers of tungsten diselenide between special mirrors. By studying the emissions resulting from stimulating the crystals with laser light, they found strong evidence that exciton-poloritons had formed in the semiconductor and the radiation had come from them, and that these particles had merged into a common macroscopic quantum state. The results conclude that two-dimensional materials can be suitable as a platform for new nanolasers that can also function at room temperature, and that light could control electric currents…read more. Open Access TECHNICAL ARTICLE
Sample sketch and polariton dispersion relation. Credit: Nature Communications volume 12, Article number: 6406 (2021)Â