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This content will become publicly available on February 26, 2017

Title: Ultralow-frequency collective compression mode and strong interlayer coupling in multilayer black phosphorus

The recent renaissance of black phosphorus (BP) as a two-dimensional (2D) layered material has generated tremendous interest, but its unique structural characters underlying many of its outstanding properties still need elucidation. Here we report Raman measurements that reveal an ultralow-frequency collective compression mode (CCM) in BP, which is unprecedented among similar 2D layered materials. This novel CCM indicates an unusually strong interlayer coupling, and this result is quantitatively supported by a phonon frequency analysis and first-principles calculations. Moreover, the CCM and another branch of low-frequency Raman modes shift sensitively with changing number of layers, allowing an accurate determination of the thickness up to tens of atomic layers, which is considerably higher than previously achieved by using high-frequency Raman modes. Lastly, these findings offer fundamental insights and practical tools for further exploration of BP as a highly promising new 2D semiconductor.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [1] ;  [4] ;  [5] ;  [6]
  1. Renmin Univ. of China, Beijing (People's Republic of China)
  2. Chinese Academy of Sciences, Anhui (People's Republic of China)
  3. Chinese Academy of Sciences, Anhui (People's Republic of China); Collaborative Innovation Center of Advanced Microstructures, Nanjing (People's Republic of China)
  4. Univ. of Nevada, Las Vegas, NV (United States)
  5. Renmin Univ. of China, Beijing (People's Republic of China); Shanghai Jiao Tong Univ., Shanghai (People's Republic of China); Collaborative Innovation Center of Advanced Microstructures, Nanjing (People's Republic of China)
  6. Renmin Univ. of China, Beijing (People's Republic of China); Collaborative Innovation Center of Advanced Microstructures, Nanjing (People's Republic of China)
Publication Date:
OSTI Identifier:
1332451
Grant/Contract Number:
NA0001982
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS