Abstract
The ability to selectively excite light with fixed handedness is crucial for circularly polarized light emission. It is commonly believed that the luminescent material chirality determines the emitted light handedness, regardless of the light emitting direction. In this paper, we propose an anomalous circular polarized light emission (ACPLE) whose handedness actually relies on the emission direction and current direction in electroluminescence. In a solid semiconductor, the ACPLE originates in the band structure topology characterized by the optical Berry curvature dipole. ACPLE exists in inversion-symmetry breaking materials including chiral materials. We exemplify the ACPLE by estimating the high circular polarization ratio in monolayer WS2. In addition, the ACPLE can be further generalized to magnetic semiconductors in which the optical Berry curvature plays a leading role instead. Our finding reveals intriguing consequences of band topology in light emission and promises optoelectric applications.
| Original language | English |
|---|---|
| Article number | 035142 |
| Journal | Physical Review B |
| Volume | 109 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 15 Jan 2024 |
Bibliographical note
We thank Daniel Kaplan and Hengxin Tan for helpful discussions. B.Y. acknowledges the financial support by the European Research Council (ERC Consolidator Grant “NonlinearTopo”, No. 815869) and the Minerva foundation with funding from the Federal German Ministry for Education and Research. Y.L. is sponsored by the Shanghai Pujiang Program (Grant No. 23PJ1413000).Publisher Copyright:
© 2024 American Physical Society.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics