Anomalous Circularly Polarized Light Emission induced by the Optical Berry Curvature Dipole

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 work, 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 WS${}_2$. 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.

7 pages, 4 figures

References in corpus (5)

• Magnetic 2D materials and heterostructures
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• The Berry curvature dipole in Weyl semimetal materials: an ab initio study
• Anomalous circularly polarized light emission in organic light-emitting diodes caused by orbital-momentum locking
• Tracing out the Berry curvature dipole and multipoles in second harmonic Hall responses of time-reversal symmetric insulators

Cited by in corpus (2)

• Geometrical Nonlinear Hall Effect Induced by Lorentz Force
• Berry Curvature Dipole-Induced Chiral Terahertz Gain and Lasing Threshold in Bulk Tellurium