Open AccessThe Research on the Complexity of 1T-TaS2 at Ultra-low Temperatures
Author(s) -
Tianxue Han
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2152/1/012002
Subject(s) - materials science , phase diagram , charge density wave , condensed matter physics , angle resolved photoemission spectroscopy , insulator (electricity) , phase transition , metal–insulator transition , graphene , photoemission spectroscopy , engineering physics , nanotechnology , phase (matter) , x ray photoelectron spectroscopy , electronic structure , metal , physics , optoelectronics , metallurgy , superconductivity , quantum mechanics , nuclear magnetic resonance
Graphene, as a successfully industrialized two-dimensional material, has greatly promoted the development of other two-dimensional materials, such as transition metal dichalcogenide (TMDs). 1T-TaS2 is a classical TMDs material, which presents metallicity at high temperature. It undergoes a variety of charge density wave (CDW) phase transitions during the temperature declining process, and presents insulating properties at low temperature. During the temperature rise period, 1T-TaS2 goes through a phase transition, from an energy band insulator to Mott insulator, followed by an insulation-metal phase transition. The complexity of 1T-TaS2 phase diagram encourages researchers to conduct extensive research on it. This paper, via means of resistance, magnetic susceptibility and other technical methods, finds out that the ultra-low temperature of 1T-TaS2 suggests additional complexity. In addition, with the angle resolved photoemission spectroscopy (ARPES) technique of in-situ alkali metal evaporation, this paper proposes that the 1T-TaS2 ultra-low temperature ground state may exist a combination of state and surface state. Our findings provide more experimental evidence for the physical mechanism of this system.