Strain-Tunable Hyperbolic Exciton Polaritons in Monolayer Black Arsenic with Two Exciton Resonances

Hongwei Wang*, Yuhan Zhong, Wei Jiang, Simone Latini, Shengxuan Xia, Tian Cui*, Zhenglu Li, Tony Low*, Feng Liu*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Hyperbolic polaritons have been attracting increasing interest for applications in optoelectronics, biosensing, and super-resolution imaging. Here, we report the in-plane hyperbolic exciton polaritons in monolayer black-arsenic (B-As), where hyperbolicity arises strikingly from two exciton resonant peaks. Remarkably, the presence of two resonances at different momenta makes overall hyperbolicity highly tunable by strain, as the two exciton peaks can be merged into the same frequency to double the strength of hyperbolicity as well as light absorption under a 1.5% biaxial strain. Moreover, the frequency of the merged hyperbolicity can be further tuned from 1.35 to 0.8 eV by an anisotropic biaxial strain. Furthermore, electromagnetic numerical simulation reveals a strain-induced hyperbolicity, as manifested in a topological transition of iso-frequency contour of exciton polaritons. The good tunability, large exciton binding energy, and strong light absorption exhibited in the hyperbolic monolayer B-As make it highly suitable for nanophotonics applications under ambient conditions.

Original languageEnglish
JournalNano Letters
Issue number6
Pages (from-to)2057-2062
Publication statusPublished - 2024


  • Excitons
  • First-principles method
  • Hyperbolic materials
  • Two-dimensional materials


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