Polarization state, as a significant degree of freedom for photons, holds immense importance in various fields, including optical communications, signal encryption, and quantum computing. Typically, the emission polarization state of semiconductor light-emitting diodes (LEDs) is restricted by the inherent crystal symmetry of the material and the optical transition selection rules. This limitation poses a challenge in achieving dynamic and active control over the polarization state.
Recently, researchers Zhang Kai and Wang Junyong (a project researcher) from the Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, along with their team of collaborators, made a groundbreaking discovery. They found that narrow-bandgap two-dimensional semiconductors, which possess unique band characteristics, could potentially pave the way for achieving dynamic control over the emission polarization state.