First-principles many-body theory for charged and neutral excitations: Trion fine structure splitting in transition metal dichalcogenides

2019 ◽  
Vol 100 (20) ◽  
Author(s):  
Abderrezak Torche ◽  
Gabriel Bester
Keyword(s):  
Fine Structure ◽  
Transition Metal ◽  
First Principles ◽  
Transition Metal Dichalcogenides ◽  
Many Body ◽  
Many Body Theory ◽  
Fine Structure Splitting ◽  
Metal Dichalcogenides ◽  
Structure Splitting ◽  
Body Theory

scholarly journals Biexcitons fine structure and non-equilibrium effects in transition metal dichalcogenides monolayers from first principles

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Abderrezak Torche ◽  
Gabriel Bester
Keyword(s):  
Fine Structure ◽  
Transition Metal ◽  
Exchange Interaction ◽  
First Principles ◽  
Transition Metal Dichalcogenides ◽  
Exciton State ◽  
Two Dimensions ◽  
Electron Hole ◽  
Metal Dichalcogenides ◽  
Non Equilibrium

AbstractTransition metal dichalcogenides monolayers host strongly bounded Coulomb complexes such as exciton and trion due to charge confinement and screening reduction in two dimensions. Biexciton, a bound state of two electrons and two holes, has also been observed in these materials with a binding energy which is one order of magnitude larger than its counterpart in conventional semiconductors. Here, using first principles methods, we address the biexciton in WSe2 monolayer and unravel the important role of the electron-hole exchange interaction in dictating the valley character of biexciton states and their fine structure. In particular, the fundamental biexciton transition which is located between the exciton and trion peaks is shown to have a fine structure of 2.8 meV mainly due to the splitting of the dark exciton state under the intervalley electron-hole exchange interaction. Non equilibrium effects are also addressed and optical fingerprints of non-thermalized biexciton population are discussed.

Flexoelectricity in atomic monolayers from first principles

Nanoscale ◽  
2020 ◽  
Author(s):  
Shashikant Kumar ◽  
David Codony ◽  
Irene Arias ◽  
Phanish Suryanarayana
Keyword(s):  
Density Functional Theory ◽  
Transition Metal ◽  
Ab Initio ◽  
First Principles ◽  
Density Functional ◽  
Transition Metal Dichalcogenides ◽  
Functional Theory ◽  
Group Iii ◽  
Flexoelectric Effect ◽  
Metal Dichalcogenides

We study the flexoelectric effect in fifty-four select atomic monolayers using ab initio Density Functional Theory (DFT). Specifically, considering representative materials from each of Group III monochalcogenides, transition metal dichalcogenides...

First-principles investigations of vanadium disulfide for lithium and sodium ion battery applications

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 54874-54879 ◽  
Author(s):  
Wenhui Wang ◽  
Zhongti Sun ◽  
Wenshuai Zhang ◽  
Quanping Fan ◽  
Qi Sun ◽  
...  
Keyword(s):  
Transition Metal ◽  
First Principles ◽  
Transition Metal Dichalcogenides ◽  
Sodium Ion ◽  
Sodium Ion Battery ◽  
Two Dimensional ◽  
Scientific Interest ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal

Recently, two-dimensional (2D) layered transition metal dichalcogenides (LTMDs) have attracted great scientific interest for ion battery applications.

Basal plane activation in monolayer MoTe2 for the hydrogen evolution reaction via phase boundaries

2020 ◽  
Vol 8 (37) ◽  
pp. 19522-19532
Author(s):  
Yiqing Chen ◽  
Pengfei Ou ◽  
Xiaohan Bie ◽  
Jun Song
Keyword(s):  
Transition Metal ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
First Principles ◽  
Basal Plane ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Phase Boundaries ◽  
Metal Dichalcogenides

The 2H/1T′ phase boundary activated hydrogen evolution reaction on two-dimensional transition metal dichalcogenides is well studied by comprehensive first-principles calculations.

Sign in / Sign up

Export Citation Format

Share Document