中国物理B ›› 2020, Vol. 29 ›› Issue (8): 86403-086403.doi: 10.1088/1674-1056/ab9440

• SPECIAL TOPIC—Ultracold atom and its application in precision measurement • 上一篇    下一篇

Thickness-dependent structural stability and transition in molybdenum disulfide under hydrostatic pressure

Jiansheng Dong(董健生), Gang Ouyang(欧阳钢)   

  1. Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Synergetic Innovation Center for Quantum Effects and Applications(SICQEA), Hunan Normal University, Changsha 410081, China
  • 收稿日期:2020-02-03 修回日期:2020-04-19 出版日期:2020-08-05 发布日期:2020-08-05
  • 通讯作者: Gang Ouyang E-mail:gangouy@hunnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 91833302).

Thickness-dependent structural stability and transition in molybdenum disulfide under hydrostatic pressure

Jiansheng Dong(董健生), Gang Ouyang(欧阳钢)   

  1. Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Synergetic Innovation Center for Quantum Effects and Applications(SICQEA), Hunan Normal University, Changsha 410081, China
  • Received:2020-02-03 Revised:2020-04-19 Online:2020-08-05 Published:2020-08-05
  • Contact: Gang Ouyang E-mail:gangouy@hunnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 91833302).

摘要: Understanding the physical mechanism of structural stability and transition in various polytypes of layered transition metal dichalcogenides under the external stimulus is of crucial importance for their new applications. Here, we investigate the thickness-dependent structural properties of MoS2 under the condition of hydrostatic pressure in terms of bond relaxation and thermodynamics considerations. For both types of MoS2 structures, we find that the transition and metallization are significantly modulated by hydrostatic pressure and the number of layers. We establish a pressure-size phase diagram to address the transition mechanism. Our study not only provides insights into the thickness-dependent structural properties of MoS2, but also shows a theoretical guidance for the design and fabrication of MoS2-based devices.

关键词: bond relaxation, thickness effect, layered transition metal dichalcogenides, structural transition, pressure modulation

Abstract: Understanding the physical mechanism of structural stability and transition in various polytypes of layered transition metal dichalcogenides under the external stimulus is of crucial importance for their new applications. Here, we investigate the thickness-dependent structural properties of MoS2 under the condition of hydrostatic pressure in terms of bond relaxation and thermodynamics considerations. For both types of MoS2 structures, we find that the transition and metallization are significantly modulated by hydrostatic pressure and the number of layers. We establish a pressure-size phase diagram to address the transition mechanism. Our study not only provides insights into the thickness-dependent structural properties of MoS2, but also shows a theoretical guidance for the design and fabrication of MoS2-based devices.

Key words: bond relaxation, thickness effect, layered transition metal dichalcogenides, structural transition, pressure modulation

中图分类号:  (Structural transitions in nanoscale materials)

  • 64.70.Nd
61.50.Ks (Crystallographic aspects of phase transformations; pressure effects) 64.10.+h (General theory of equations of state and phase equilibria) 64.60.an (Finite-size systems)