Bright dipolar excitons in twisted black phosphorus homostructures
arXiv:2411.01905 · doi:10.1126/science.adq2977
Abstract
Bright dipolar excitons, which contain electrical dipoles and have high oscillator strength, are an ideal platform for studying correlated quantum phenomena. They usually rely on carrier tunneling between two quantum wells or two layers to hybridize with nondipolar excitons to gain oscillator strength. In this work, we uncovered a new type of bright infrared dipolar exciton by stacking 90°-twisted black phosphorus (BP) structures. These excitons, inherent to the reconstructed band structure, exhibit high oscillator strength. Most importantly, they inherit the linear polarization from BP, which allows light polarization to be used to select the dipole direction. Moreover, the dipole moment and resonance energy can be widely tuned by the thickness of the BP. Our results demonstrate a useful platform for exploring tunable correlated dipolar excitons.
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Cited by in corpus (4)
- Quantitatively predicting angle-resolved polarized Raman intensity of anisotropic layered materials
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- Moiré excitons in generalized Wigner crystals
- Moiré spintronics: Emergent phenomena, material realization and machine learning accelerating discovery