scholarly journals The Research on the Complexity of 1T-TaS2 at Ultra-low Temperatures

2022 ◽  
Vol 2152 (1) ◽  
pp. 012002
Author(s):  
Tianxue Han

Abstract 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.

2020 ◽  
Vol 56 (78) ◽  
pp. 11645-11648
Author(s):  
Huangqing Ye ◽  
Jiahui Chen ◽  
Yougen Hu ◽  
Gang Li ◽  
Xian-Zhu Fu ◽  
...  

Two-dimensional (2D) multilayered graphitic carbon nanosheets are prepared via a facile, green, and mild method of one-pot hydrothermal carbonization at a temperature below 300 °C.


Nanoscale ◽  
2015 ◽  
Vol 7 (34) ◽  
pp. 14489-14495 ◽  
Author(s):  
B. Wang ◽  
S. M. Eichfield ◽  
D. Wang ◽  
J. A. Robinson ◽  
M. A. Haque

Heterostructures of two-dimensional materials can be vulnerable to thermal degradation due to structural and interfacial defects as well as thermal expansion mismatch, yet a systematic study does not exist in the literature.


Open Physics ◽  
2003 ◽  
Vol 1 (3) ◽  
Author(s):  
Sergei Ovchinnikov ◽  
Elena Shneyder

AbstractWe have calculated the spectral function and density of states of halffilled two-dimensional Hubbard model in the Hubbard-I approximation assuming an antiferromagnetic long range order at low temperature and compared results to the QMC data. It occurs that calculated functions are in a qualitative agreement with the QMC one. We have also shown that Neel ordered state dispersion has the similar form to the spin density wave one.


2009 ◽  
Vol 102 (6) ◽  
Author(s):  
A. Tomeljak ◽  
H. Schäfer ◽  
D. Städter ◽  
M. Beyer ◽  
K. Biljakovic ◽  
...  

2006 ◽  
Vol 73 (19) ◽  
Author(s):  
Junfeng Wang ◽  
Rui Xiong ◽  
Di Yin ◽  
Changzhen Li ◽  
Zheng Tang ◽  
...  

2021 ◽  
Vol 38 (12) ◽  
pp. 127102
Author(s):  
Yuxin Yang ◽  
Wenhui Fan ◽  
Qinghua Zhang ◽  
Zhaoxu Chen ◽  
Xu Chen ◽  
...  

We report the structure and physical properties of two newly discovered compounds AV8Sb12 and AV6Sb6 (A = Cs, Rb), which have C 2 (space group: Cmmm) and C 3 (space group: R 3 ¯ m ) symmetry, respectively. The basic V-kagome unit appears in both compounds, but stacking differently. A V2Sb2 layer is sandwiched between two V3Sb5 layers in AV8Sb12, altering the V-kagome lattice and lowering the symmetry of kagome layer from hexagonal to orthorhombic. In AV6Sb6, the building block is a more complex slab made up of two half-V3Sb5 layers that are intercalated by Cs cations along the c-axis. Transport property measurements demonstrate that both compounds are nonmagnetic metals, with carrier concentrations at around 1021 cm−3. No superconductivity has been observed in CsV8Sb12 above 0.3 K under in situ pressure up to 46 GPa. Compared to CsV3Sb5, theoretical calculations and angle-resolved photoemission spectroscopy reveal a quasi-two-dimensional electronic structure in CsV8Sb12 with C 2 symmetry and no van Hove singularities near the Fermi level. Our findings will stimulate more research into V-based kagome quantum materials.


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