Dynamically tunable polarized mid-infrared light-emitting diodes from polarization singularities in a band-edge Weyl node.

ABSTRACT: The polarization states of light-emitting devices in conventional semiconductors are typically deterministically fixed by optical transition selection rules. However, in emerging Weyl semiconductors, band-crossing Weyl nodes introduce exotic polarization contrasts, making emission polarization sensitive to carrier dynamics. Here, we demonstrate mid-infrared light-emitting diodes based on van der Waals tellurium, a Weyl semiconductor featuring a Weyl node precisely at the conduction band minimum (CBM). These devices demonstrate high polarization tunability, with linear polarization degrees continuously adjustable from ~100% (low carrier density) to 36% (high carrier density). First-principles calculations reveal that this tunability originates from polarization singularities induced by CBM-

SUBMITTER: Zhang J 

PROVIDER: S-EPMC12715210 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature