scholarly journals Topological Phase Transition: Terahertz Driven Reversible Topological Phase Transition of Monolayer Transition Metal Dichalcogenides (Adv. Sci. 12/2021)

2021 ◽  
Vol 8 (12) ◽  
pp. 2170072
Author(s):  
Jian Zhou ◽  
Haowei Xu ◽  
Yongliang Shi ◽  
Ju Li
Keyword(s):  
Phase Transition ◽  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Topological Phase ◽  
Topological Phase Transition ◽  
Metal Dichalcogenides

scholarly journals Floquet band engineering and topological phase transitions in 1T’ transition metal dichalcogenides

2D Materials ◽  
2022 ◽  
Author(s):  
Xiangru Kong ◽  
Wei Luo ◽  
Linyang Li ◽  
Mina Yoon ◽  
Tom Berlijn ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Tight Binding ◽  
Polarized Light ◽  
Quantum Spin ◽  
Topological Phase ◽  
Circularly Polarized Light ◽  
Band Engineering ◽  
Metal Dichalcogenides

Abstract Using ab initio tight-binding approaches, we investigate Floquet band engineering of the 1T’ phase of transition metal dichalcogenides (MX2, M = W, Mo and X = Te, Se, S) monolayers under the irradiation with circularly polarized light. Our first principles calculations demonstrate that light can induce important transitions in the topological phases of this emerging materials family. For example, upon irradiation, Te-based MX2 undergoes a phase transition from quantum spin Hall (QSH) semimetal to time-reversal symmetry broken QSH insulator with a nontrivial band gap of up to 92.5 meV. On the other hand, Se- and S-based MX2 undergoes the topological phase transition from the QSH effect to the quantum anomalous Hall (QAH) effect and into trivial phases with increasing light intensity. From a general perspective, our work brings further insight into non-equilibrium topological systems.

scholarly journals Strain Induced Phase Transition of WS2 by Local Dewetting of Au/Mica Film upon Annealing

Surfaces ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 1-8
Author(s):  
Tomasz Kosmala ◽  
Pawel Palczynski ◽  
Matteo Amati ◽  
Luca Gregoratti ◽  
Hikmet Sezen ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Metal ◽  
Thermal Annealing ◽  
Tensile Strain ◽  
Structural Phase ◽  
Transition Metal Dichalcogenides ◽  
Proof Of Concept ◽  
Threshold Strain ◽  
Metal Dichalcogenides ◽  
Phase Engineering

Here, we present a proof-of-concept experiment where phase engineering at the nanoscale of 2D transition metal dichalcogenides (TMDC) flakes (from semiconducting 2H phase to metallic 1T phase) can be achieved by thermal annealing of a TMDC/Au/mica system. The local dewetting of Au particles and resulting tensile strain produced on the TMDC flakes, strongly bound to the Au surface through effective S-Au bonds, can induce a local structural phase transition. An important role is also played by the defects induced by the thermal annealing: when vacancies are present, the threshold strain needed to trigger the phase transition is significantly reduced. Scanning photoelectron microscopy (SPEM) was revealed to be the perfect tool to monitor the described phenomena.

Broadband 1T-titanium selenide-based saturable absorbers for solid-state bulk lasers

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20171-20177 ◽  
Author(s):  
Bingzheng Yan ◽  
Baitao Zhang ◽  
Hongkun Nie ◽  
Guoru Li ◽  
Xiaoli Sun ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Saturable Absorbers ◽  
Metal Dichalcogenides

1T-titanium selenide (1T-TiSe2), a representative of 1T phase transition metal dichalcogenides (TMDs), exhibits semimetallic behaviour with a nearly zero bandgap structure, which makes it a promising photoelectric material.

Electron-injection driven phase transition in two-dimensional transition metal dichalcogenides

2020 ◽  
Vol 8 (13) ◽  
pp. 4432-4440 ◽  
Author(s):  
Xiangyu Zhou ◽  
Haibo Shu ◽  
Qiuqi Li ◽  
Pei Liang ◽  
Dan Cao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Electron Injection ◽  
Two Dimensional ◽  
Metal Dichalcogenides ◽  
T Phase

Electron injection leads to the transition of two-dimensional MoX2 (X = S, Se, and Te) nanosheets from the semiconducting H phase to semimetallic T′ phase.

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