scholarly journals Chiral selection rules for multi-photon processes in two-dimensional honeycomb materials

2019 ◽  
Vol 44 (9) ◽  
pp. 2141 ◽  
Author(s):  
Jingxin Cheng ◽  
Di Huang ◽  
Tao Jiang ◽  
Yuwei Shan ◽  
Yingguo Li ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Selection Rules ◽  
Chiral Selection

scholarly journals Selection rules for Cooper pairing in two-dimensional interfaces and sheets

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Mathias S. Scheurer ◽  
Daniel F. Agterberg ◽  
Jörg Schmalian
Keyword(s):  
Cooper Pairing ◽  
Two Dimensional ◽  
Selection Rules

Shear-strain-mediated photoluminescence manipulation in two-dimensional transition metal dichalcogenides

2D Materials ◽  
2021 ◽  
Author(s):  
Hyeong-Yong Hwang ◽  
Sehyuk Lee ◽  
Yong-Hoon Kim ◽  
Farman Ullah ◽  
Chinh Tam Le ◽  
...  
Keyword(s):  
Transition Metal ◽  
Shear Strain ◽  
Compressive Strain ◽  
Transition Metal Dichalcogenides ◽  
Normal Strain ◽  
Two Dimensional ◽  
Band Structures ◽  
Electronic Band ◽  
Selection Rules ◽  
Metal Dichalcogenides

Abstract In two-dimensional transition metal dichalcogenides, normal strain can modulate electronic band structures, yet leaving the optical selection rules intact. In contrast, a shear strain can perturb the spin-valley locked band structures and possibly induce mixing of the spin subbands which in turn can transfer oscillator strength between spin-allowed bright and spin-forbidden dark excitons. Here, we report a novel scheme to manipulate photoluminescence in a monolayer WSe2-MoSe2 lateral heterostructures, controlled by an external bending method in which strong out-of plane shear strain (OSS) of up to 5.6% accompanies weak in-plane normal strain up to 0.72%. The spectra revealed a striking dependence on the bending direction that is stagnant in the negative (compressive) strain region and then rapidly changes with increasing positive (tensile) strain. The dependency of the photoluminescence signal under tensile bending was represented not only by the large energy shift (>40 meV) of the lowest excited states of both the WSe2 and MoSe2 monolayers, but also by the tendency to violate the optical selection rules that brightens (darkens) the excitons of the WSe2 (MoSe2) side. The analyses on the observed energy shifts and PL intensity changes confirm the different origins in compressive bending compared with tensile bending. The well-established band-anticrossing is identified to be affecting only the compressive deformation region. The spectral changes in the tensile region, on the other hand, originates mainly from the generation of an off-diagonal perturbation to a spin-specific Hamiltonian induced by OSS. The degree of spin-state mixing, which correlates precisely with the spin-flip coefficient of the theoretical model, is further represented by the OSS matrix elements, the spin splitting energy, and the shear deformation potential.

scholarly journals Selection rules of twistronic angles in two-dimensional material flakes via dislocation theory

2021 ◽  
Vol 103 (11) ◽  
Author(s):  
Shuze Zhu ◽  
Emil Annevelink ◽  
Pascal Pochet ◽  
Harley T. Johnson
Keyword(s):  
Dislocation Theory ◽  
Two Dimensional ◽  
Selection Rules

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

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