TY - JOUR
T1 - Strain-Tunable Hyperbolic Exciton Polaritons in Monolayer Black Arsenic with Two Exciton Resonances
AU - Wang, Hongwei
AU - Zhong, Yuhan
AU - Jiang, Wei
AU - Latini, Simone
AU - Xia, Shengxuan
AU - Cui, Tian
AU - Li, Zhenglu
AU - Low, Tony
AU - Liu, Feng
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024/2/14
Y1 - 2024/2/14
N2 - 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.
AB - 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.
KW - Excitons
KW - First-principles method
KW - Hyperbolic materials
KW - Two-dimensional materials
UR - http://www.scopus.com/inward/record.url?scp=85184815030&partnerID=8YFLogxK
U2 - 10.1021/acs.nanolett.3c04730
DO - 10.1021/acs.nanolett.3c04730
M3 - Article
C2 - 38285001
AN - SCOPUS:85184815030
SN - 1530-6984
VL - 24
SP - 2057
EP - 2062
JO - Nano Letters
JF - Nano Letters
IS - 6
ER -