Piezoelectric substrate-induced strain engineering on tuning polarized Raman spectra of crystalline black phosphorus

Yuqian Zhao, Feng Guo, Sin Yi Pang, Weng Fu Io, Lok Wing Wong, Jiong Zhao, Jianhua Hao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

A black phosphorus (BP) ultrathin nanosheet has significant research values in broad fields ranging from nano-electronics/photonics to quantum physics. Here, a piezoelectric actuator is utilized to perform biaxial strain engineering for the investigation of anisotropic Raman response of the ultrathin BP transferred to the oxide dielectric substrate. Three characteristic peaks exhibit redshift when tensile strain is applied, while the peaks reveal blueshift under compressive strain. When applying compressive strain of -0.2%, the Raman shift rate of B2g mode can reach up to 15.3 cm-1/%. In contrast, with the application of 0.2% tensile strain, the B2g mode is shifted by -12.2 cm-1/%. Furthermore, we calculated the Grüneisen parameters to deduce the relationship between the tensile or compressive strain and phonon behavior of crystalline BP. The physical mechanism behind the observation of strained Raman response is discussed, which is related to the variations of bond angle and bond length in BP. Additionally, biaxial strain modulation may change the anisotropic dispersion of BP, revealing the significant potential of BP in innovative polarized light detection.

Original languageEnglish
Article number132903
JournalApplied Physics Letters
Volume122
Issue number13
DOIs
Publication statusPublished - 27 Mar 2023

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint

Dive into the research topics of 'Piezoelectric substrate-induced strain engineering on tuning polarized Raman spectra of crystalline black phosphorus'. Together they form a unique fingerprint.

Cite this