Black phosphorene exhibiting negative thermal expansion and negative linear compressibility

Lei Wang, Cong Wang, Ying Chen

Research output: Contribution to journalArticle

Abstract

Positive expansion on heating, and positive contraction on hydrostatic compression are our general understanding. Actually, the abnormal negative thermal expansion (NTE) or negative linear compressibility (NLC) behavior is permissible, but exists in very few materials. Interestingly, we find that the NTE and NLC behaviors can coexist in the low-dimensional black phosphorene using first-principles calculations. In the temperature-field, the volume-NTE of black phosphorene can be exhibited below about 200 K, while the axial-NTE exists in the whole studied temperature range. In the hydrostatic pressure-field, the NLC behavior can occur along a zigzag direction or armchair direction in different pressure ranges. The phonon abnormality in black phosphorene is detected. It is found that acoustic phonons, especially the lowest-frequency TAz mode, play a very important role. The re-entrant honeycomb network in black phosphorene, as the specific topology, will facilitate the occurrence of NTE and NLC behaviors. This work can provide some foundations and clues for exploring the abnormal properties in other 2D materials.

Original languageEnglish
Article number465003
JournalJournal of Physics Condensed Matter
Volume31
Issue number46
DOIs
Publication statusPublished - 2019 Aug 20

Keywords

  • black phosphorene
  • negative linear compressibility
  • negative thermal expansion

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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