Layer-dependent Exciton Polarizability and the Brightening of Dark Excitons in Few-layer Black Phosphorus

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Sep 1

PMID 37658093

Authors

Yuchen Lei

Junwei Ma

Jiaming Luo

Shenyang Huang

Boyang Yu

Chaoyu Song

Qiaoxia Xing

Fanjie Wang

Yuangang Xie

Jiasheng Zhang

Lei Mu

Yixuan Ma

Chong Wang

Hugen Yan

Affiliations

Soon will be listed here.

Abstract

The evolution of excitons from 2D to 3D is of great importance in photo-physics, yet the layer-dependent exciton polarizability hasn't been investigated in 2D semiconductors. Here, we determine the exciton polarizabilities for 3- to 11-layer black phosphorus-a direct bandgap semiconductor regardless of the thickness-through frequency-resolved photocurrent measurements on dual-gate devices and unveil the carrier screening effect in relatively thicker samples. By taking advantage of the broadband photocurrent spectra, we are also able to reveal the exciton response for higher-index subbands under the gate electrical field. Surprisingly, dark excitons are brightened with intensity even stronger than the allowed transitions above certain electrical field. Our study not only sheds light on the exciton evolution with sample thickness, but also paves a way for optoelectronic applications of few-layer BP in modulators, tunable photodetectors, emitters and lasers.

Citing Articles

Infrared optoelectronics in twisted black phosphorus.

Chen S, Liang Z, Miao J, Yu X, Wang S, Zhang Y Nat Commun. 2024; 15(1):8834.

PMID: 39397018 PMC: 11471851. DOI: 10.1038/s41467-024-53125-4.

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