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Selected Works of Santosh KC
Article
Charge Mediated Reversible Metal-Insulator Transition in Monolayer MoTe2 and WxMo1-xTe2 Alloy
ACS Nano (2016)
  • Chenxi Zhang, The University of Texas at Dallas
  • Santosh KC, The University of Texas at Dallas
  • Yifan Nie, The University of Texas at Dallas
  • Chaoping Liang, The University of Texas at Dallas
  • William G. Vandenberghe, The University of Texas at Dallas
  • Roberto C. Longo, The University of Texas at Dallas
  • Yongping Zheng, The University of Texas at Dallas
  • Fantai Kong, The University of Texas at Dallas
  • Suklyun Hong, Sejong University
  • Robert M. Wallace, The University of Texas at Dallas
  • Kyeongjae Cho, The University of Texas at Dallas
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Abstract
Metal–insulator transitions in low-dimensional materials under ambient conditions are rare and worth pursuing due to their intriguing physics and rich device applications. Monolayer MoTe2 and WTe2 are distinguished from other TMDs by the existence of an exceptional semimetallic distorted octahedral structure (T′) with a quite small energy difference from the semiconducting H phase. In the process of transition metal alloying, an equal stability point of the H and the T′ phase is observed in the formation energy diagram of monolayer WxMo1–xTe2. This thermodynamically driven phase transition enables a controlled synthesis of the desired phase (H or T′) of monolayer WxMo1–xTe2 using a growth method such as chemical vapor deposition (CVD) and molecular beam epitaxy (MBE). Furthermore, charge mediation, as a more feasible method, is found to make the T′ phase more stable than the H phase and induce a phase transition from the H phase (semiconducting) to the T′ phase (semimetallic) in monolayer WxMo1–xTe2 alloy. This suggests that a dynamic metal–insulator phase transition can be induced, which can be exploited for rich phase transition applications in two-dimensional nanoelectronics.
Keywords
  • two-dimensional materials,
  • metal−insulator transition,
  • transition metal dichalcogenides (TMDs),
  • reversible phase transition,
  • monolayer alloys,
  • electrostatic charge
Disciplines
Publication Date
July 14, 2016
DOI
10.1021/acsnano.6b00148
Publisher Statement
SJSU users: Use the following link to login and access the article via SJSU databases.
Citation Information
Chenxi Zhang, Santosh KC, Yifan Nie, Chaoping Liang, et al.. "Charge Mediated Reversible Metal-Insulator Transition in Monolayer MoTe2 and WxMo1-xTe2 Alloy" ACS Nano Vol. 10 Iss. 8 (2016)
Available at: http://works.bepress.com/santosh-kc/6/