Highly anisotropic and robust excitons in monolayer black phosphorus.
By Xiaomu Wang, Aaron M. Jones, K. Seyler, V. Tran, Yichen Jia, Huan Zhao, Han Wang, Li Yang, Xiaodong Xu, Fengnian Xia. Nature Nanotechnology, 2014
1,308 citations recorded by the source corpus.
Semi-metallic graphene and semiconducting monolayer transition-metal dichalcogenides are the most intensively studied two-dimensional materials of recent years. Lately, black phosphorus has emerged as a promising new two-dimensional material due to its widely tunable and direct bandgap, high carrier mobility and remarkable in-plane anisotropic electrical, optical and phonon properties. However, current progress is primarily limited to its thin-film form. Here, we reveal highly anisotropic and strongly bound excitons in monolayer black phosphorus using polarization-resolved photoluminescence measurements at room temperature. We show that, regardless of the excitation laser polarization, the emitted light from the monolayer is linearly polarized along the light effective mass direction and centres around 1.3 eV, a clear signature of emission from highly anisotropic bright excitons. Moreover, photoluminescence excitation spectroscopy suggests a quasiparticle bandgap of 2.2 eV, from which we estimate an exciton binding energy of ∼0.9 eV, consistent with theoretical results based on first principles. The experimental observation of highly anisotropic, bright excitons with large binding energy not only opens avenues for the future explorations of many-electron physics in this unusual two-dimensional material, but also suggests its promising future in optoelectronic devices.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/9fc8787c1fec63d5b2d7f99300cf5c92cd653941
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Citations in the corpus
- Excitons in atomically thin 2D semiconductors and their applications (2017, background): “Comparatively, phosphorene is a 2D crystal whose excitonic properties are similar to one-dimensional carbon nanotubes [39].”
- Direct evidence of metallic bands in a monolayer boron sheet (2015, background): “and gap at the Fermi level. Since the discovery of graphene in 2004 [8, 9, 10, 11], there is a boom of research on monolayer materials, such as silicene [12, 13, 14], germanene [15, 16, 17] and so on [18, 19, 20, 21]. Monolayer boron has also been intensively studied using first-principles calculati”
- Anisotropic optical and electronic properties of two-dimensional layered germanium sulfide (2017, methodology): “This suggests that the PL originates from intrinsic states and not impurities or vacancy states [6, 33, 34].”