Thickness dependence of the charge-density-wave transition temperature in VSe2

2014 ◽  
Vol 105 (6) ◽  
pp. 063109 ◽  
Author(s):  
Jiyong Yang ◽  
Weike Wang ◽  
Yan Liu ◽  
Haifeng Du ◽  
Wei Ning ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Thickness Dependence

Modulation of doping and biaxial strain on the transition temperature of the charge density wave transition in 1T-TiSe2

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 76972-76979 ◽  
Author(s):  
Zhen-Guo Fu ◽  
Zi-Yu Hu ◽  
Yu Yang ◽  
Yong Lu ◽  
Fa-Wei Zheng ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Biaxial Strain ◽  
Charge Doping

We study the effects of charge doping and biaxial strains on the transition temperature of charge density wave (CDW) transition in TiSe2.

scholarly journals Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuki Nakata ◽  
Katsuaki Sugawara ◽  
Ashish Chainani ◽  
Hirofumi Oka ◽  
Changhua Bao ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Charge Density ◽  
Electron Correlation ◽  
Charge Density Wave ◽  
Room Temperature ◽  
High Temperature Superconductivity ◽  
Density Wave ◽  
Mott Insulator ◽  
Transition Metal Dichalcogenide ◽  
A Charge

AbstractCombination of low-dimensionality and electron correlation is vital for exotic quantum phenomena such as the Mott-insulating phase and high-temperature superconductivity. Transition-metal dichalcogenide (TMD) 1T-TaS2 has evoked great interest owing to its unique nonmagnetic Mott-insulator nature coupled with a charge-density-wave (CDW). To functionalize such a complex phase, it is essential to enhance the CDW-Mott transition temperature TCDW-Mott, whereas this was difficult for bulk TMDs with TCDW-Mott < 200 K. Here we report a strong-coupling 2D CDW-Mott phase with a transition temperature onset of ~530 K in monolayer 1T-TaSe2. Furthermore, the electron correlation derived lower Hubbard band survives under external perturbations such as carrier doping and photoexcitation, in contrast to the bulk counterpart. The enhanced Mott-Hubbard and CDW gaps for monolayer TaSe2 compared to NbSe2, originating in the lattice distortion assisted by strengthened correlations and disappearance of interlayer hopping, suggest stabilization of a likely nonmagnetic CDW-Mott insulator phase well above the room temperature. The present result lays the foundation for realizing monolayer CDW-Mott insulator based devices operating at room temperature.

scholarly journals Theory of the thickness dependence of the charge density wave transition in 1 T-TiTe2

2D Materials ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 045032
Author(s):  
Jianqiang Sky Zhou ◽  
Raffaello Bianco ◽  
Lorenzo Monacelli ◽  
Ion Errea ◽  
Francesco Mauri ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Thickness Dependence

Charge Density Wave and Spin Density Wave in Two-Orbital Model for Iron-Based Superconductors

SPIN ◽  
2018 ◽  
Vol 08 (02) ◽  
pp. 1850007
Author(s):  
B. Pradhan
Keyword(s):  
Transition Temperature ◽  
Charge Density ◽  
Spin Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Spin Density Wave ◽  
Coupling Constants ◽  
Electronic Density ◽  
Iron Based Superconductors ◽  
Iron Based

We present a mean-field theoretical model study for the coexistence of the two strongly interacting charge density wave (CDW) and spin density wave (SDW) for iron-based superconductors in the under-doped region before the onset of the superconductivity in the system. The analytic expressions for the temperature dependence of the CDW and SDW order parameters are derived by using Zubarev’s technique of double-time single particle Green’s functions and solved self-consistently. Their interplay is studied by varying both the CDW and SDW coupling constants. Further, the electronic density of states (DOS) for the conduction electrons are studied in the pure CDW and SDW states and coexistence state for the cases, where the CDW transition temperature is greater than the SDW transition temperature and vice versa, which show two gap parameters.

Incommensurate modulated phases of the NbxTa1-xTe4 charge density wave system

1992 ◽  
Vol 50 (1) ◽  
pp. 58-59
Author(s):  
S. Ritchie ◽  
J. C. Bennett ◽  
A. Prodan ◽  
F.W. Boswell ◽  
J.M. Corbett
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Direct Evidence ◽  
Density Wave ◽  
Wave System ◽  
Modulated Phases ◽  
Metal Atoms ◽  
Incommensurate Modulation ◽  
End Members ◽  
Modulation Wave Vector

A continuous sequence of compounds having composition NbxTa1-xTe4; 0 ≤ x ≤ 1 have been studied by electron diffraction and microscopy. Previous studies have shown that the end members of the series, TaTε4 and NbTε4 possess a quasi-one-dimensional character and exhibit charge density wave (CDW) distortions. In these compounds, the subcell structure is tetragonal with axes (a × a × c) and consists of the metal atoms (Nb or Ta) centered within an extended antiprismatic cage of Te atoms. At room temperature, TaTε4 has a commensurate modulation structure with a 2a × 2a × 3c unit cell. In NbTε4, an incommensurate modulation with × ∼ 16c axes is observed. Preliminary studies of the mixed compounds NbxTα1-xTε4 showed a discontinuous jump of the modulation wave vector commensurate to incommensurate when the Nb dopant concentration x, exceeded x ≃ 0.3, In this paper, the nature of the compositional dependence of is studied in greater detail and evidence is presented for a stepwise variation of . This constitutes the first direct evidence for a Devil's staircase in CDW materials.

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