We present an overview on the electronic band structure of surface-doped black phosphorus. Angle-resolved photoemission spectroscopy data show that the in situ deposition of potassium atoms on the surface of single-crystalline black phosphorus modulates the band gap in the wide range of 0.0–0.6 eV. At zero band gap, the surface layers of black phosphorus become a Dirac semimetal whose band dispersion is highly anisotropic, linear in armchair and quadratic in zigzag directions. In light of theoretical band calculations, we elucidate the mechanism of these band modifications as the giant Stark effect due to strong vertical electric fields induced by potassium atoms.
|Number of pages||6|
|Journal||Journal of Electron Spectroscopy and Related Phenomena|
|Publication status||Published - 2017 Aug|
Bibliographical noteFunding Information:
This work was supported by the POSTECH Basic Science Research Institute Grant and the Brain Korea 21 Plus Project. J.K. was supported by NRF (National Research Foundation of Korea) Grant funded by the Korean Government (NRF-2016-Fostering Core Leaders of the Future Basic Science Program/Global Ph.D. Fellowship Program).
© 2016 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Physical and Theoretical Chemistry