Nano Research

, Volume 8, Issue 12, pp 3944–3953 | Cite as

Remarkable anisotropic phonon response in uniaxially strained few-layer black phosphorus

Research Article

Abstract

Black phosphorus (BP) is a good candidate for studying strain effects on twodimensional (2D) materials beyond graphene and transition-metal dichalcogenides. This is because of its particular ability to sustain high strain and remarkably anisotropic mechanical properties resulting from its unique puckered structure. We here investigate the dependence of lattice vibrational frequencies on crystallographic orientations in uniaxially strained few-layer BP by in-situ strained Raman spectroscopy. The out-of-plane A1g mode is sensitive to uniaxial strain along the near-armchair direction whereas the in-plane B2g and A2g modes are sensitive to strain in the near-zigzag direction. For uniaxial strains applied away from these directions, all three phonon modes are linearly redshifted. Our experimental observation is explained by the anisotropic influence of uniaxial tensile strain on structural properties of BP using density functional theory. This study demonstrates the possibility of selective tuning of in-plane and out-of-plane phonon modes in BP by uniaxial strain and makes strain engineering a promising avenue for extensively modulating the optical and mechanical properties of 2D materials.

Keywords

black phosphorus uniaxial strain Raman spectroscopy anisotropy density functional theory 

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Yanlong Wang
    • 1
  • Chunxiao Cong
    • 1
  • Ruixiang Fei
    • 2
  • Weihuang Yang
    • 1
  • Yu Chen
    • 1
  • Bingchen Cao
    • 1
  • Li Yang
    • 2
  • Ting Yu
    • 1
    • 3
  1. 1.Division of Physics and Applied PhysicsSchool of Physical and Mathematical Sciences, Nanyang Technological UniversitySingapore CitySingapore
  2. 2.Department of PhysicsWashington University in St. LouisSt. LouisUSA
  3. 3.Department of PhysicsFaculty of Science, National University of SingaporeSingapore CitySingapore

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