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

2022 ◽  
Vol 2152 (1) ◽  
pp. 012002
Author(s):  
Tianxue Han
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Density Wave ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Two Dimensional Materials ◽  
Metal Evaporation ◽  
Metal Phase Transition

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.

One-pot synthesis of two-dimensional multilayered graphitic carbon nanosheets by low-temperature hydrothermal carbonization using the in situ formed copper as a template and catalyst

2020 ◽  
Vol 56 (78) ◽  
pp. 11645-11648
Author(s):  
Huangqing Ye ◽  
Jiahui Chen ◽  
Yougen Hu ◽  
Gang Li ◽  
Xian-Zhu Fu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hydrothermal Carbonization ◽  
Graphitic Carbon ◽  
Two Dimensional ◽  
One Pot ◽  
Carbon Nanosheets ◽  
One Pot Synthesis

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.

In situ degradation studies of two-dimensional WSe2–graphene heterostructures

Nanoscale ◽  
2015 ◽  
Vol 7 (34) ◽  
pp. 14489-14495 ◽  
Author(s):  
B. Wang ◽  
S. M. Eichfield ◽  
D. Wang ◽  
J. A. Robinson ◽  
M. A. Haque
Keyword(s):  
Thermal Expansion ◽  
Thermal Degradation ◽  
Systematic Study ◽  
Two Dimensional ◽  
Thermal Expansion Mismatch ◽  
Two Dimensional Materials ◽  
Interfacial Defects ◽  
In Situ Degradation ◽  
Degradation Studies

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.

Electron spectral density of the half-filled Hubbard model in the atomic limit at finite temperature

Open Physics ◽  
2003 ◽  
Vol 1 (3) ◽  
Author(s):  
Sergei Ovchinnikov ◽  
Elena Shneyder
Keyword(s):  
Low Temperature ◽  
Spectral Density ◽  
Hubbard Model ◽  
Density Wave ◽  
Spin Density Wave ◽  
Long Range Order ◽  
Two Dimensional ◽  
Similar Form ◽  
Atomic Limit ◽  
Ordered State

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.

scholarly journals Dynamics of Photoinduced Charge-Density-Wave to Metal Phase Transition inK0.3MoO3

2009 ◽  
Vol 102 (6) ◽  
Author(s):  
A. Tomeljak ◽  
H. Schäfer ◽  
D. Städter ◽  
M. Beyer ◽  
K. Biljakovic ◽  
...  
Keyword(s):  
Phase Transition ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Metal Phase ◽  
Metal Phase Transition ◽  
Photoinduced Charge

Low-temperature specific heat of the quasi-two-dimensional charge-density wave compoundKMo6O17

2006 ◽  
Vol 73 (19) ◽  
Author(s):  
Junfeng Wang ◽  
Rui Xiong ◽  
Di Yin ◽  
Changzhen Li ◽  
Zheng Tang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Charge Density ◽  
Specific Heat ◽  
Charge Density Wave ◽  
Density Wave ◽  
Two Dimensional ◽  
Low Temperature Specific Heat

scholarly journals Discovery of Two Families of Vsb-Based Compounds with V-Kagome Lattice

2021 ◽  
Vol 38 (12) ◽  
pp. 127102
Author(s):  
Yuxin Yang ◽  
Wenhui Fan ◽  
Qinghua Zhang ◽  
Zhaoxu Chen ◽  
Xu Chen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Theoretical Calculations ◽  
Photoemission Spectroscopy ◽  
Two Dimensional ◽  
Kagome Lattice ◽  
Space Group ◽  
Kagomé Lattice ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Nonmagnetic Metals

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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