scholarly journals Nonadiabatic exciton-phonon coupling in Raman spectroscopy of layered materials

2020 ◽  
Vol 6 (32) ◽  
pp. eabb5915 ◽  
Author(s):  
Sven Reichardt ◽  
Ludger Wirtz
Keyword(s):  
Quantum Interference ◽  
Hexagonal Boron Nitride ◽  
Layered Materials ◽  
Interference Effects ◽  
Orbit Splitting ◽  
Spin Orbit Splitting ◽  
Nonadiabatic Effects ◽  
Resonant Raman ◽  
The Impact ◽  
Exciton Scattering

We present an ab initio computational approach for the calculation of resonant Raman intensities, including both excitonic and nonadiabatic effects. Our diagrammatic approach, which we apply to two prototype, semiconducting layered materials, allows a detailed analysis of the impact of phonon-mediated exciton-exciton scattering on the intensities. In the case of bulk hexagonal boron nitride, this scattering leads to strong quantum interference between different excitonic resonances, strongly redistributing oscillator strength with respect to optical absorption spectra. In the case of MoS2, we observe that quantum interference effects are suppressed by the spin-orbit splitting of the excitons.

scholarly journals Quantum interference effects in multi-channel correlated tunneling structures

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
N. S. Maslova ◽  
V. N. Mantsevich ◽  
V. N. Luchkin ◽  
V. V. Palyulin ◽  
P. I. Arseyev ◽  
...  
Keyword(s):  
Coulomb Interaction ◽  
Quantum Interference ◽  
Tunneling Conductance ◽  
Interference Effects ◽  
Impurity Atoms ◽  
Occupation Numbers ◽  
Fano Interference ◽  
Main Effect ◽  
The Impact ◽  
Intermediate System

AbstractIn multi-channel tunneling systems quantum interference effects modify tunneling conductance spectra due to Fano effect. We investigated the impact of Hubbard type Coulomb interaction on tunneling conductance spectra for the system formed by several interacting impurity atoms or quantum dots localised between the contact leads. It was shown that the Fano shape of tunneling conductance spectra strongly changes in the presence of on-site Coulomb interaction between localised electrons in the intermediate system. The main effect which determines the shape of the tunneling peaks could be not Fano interference but mostly nonequilibrium dependence of the occupation numbers on bias voltage.

Spin-Orbit Splitting in Single-LayerMoS2Revealed by Triply Resonant Raman Scattering

2013 ◽  
Vol 111 (12) ◽  
Author(s):  
Linfeng Sun ◽  
Jiaxu Yan ◽  
Da Zhan ◽  
Lei Liu ◽  
Hailong Hu ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Spin Orbit ◽  
Orbit Splitting ◽  
Spin Orbit Splitting ◽  
Resonant Raman ◽  
Resonant Raman Scattering

scholarly journals Quantum interference effects in Higgs boson pair-production beyond the standard model

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Biswaranjan Das ◽  
Stefano Moretti ◽  
Shoaib Munir ◽  
Poulose Poulose
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Pair Production ◽  
Quantum Interference ◽  
Hadron Collider ◽  
Gluon Fusion ◽  
Higgs Doublet ◽  
New Physics ◽  
Interference Effects ◽  
The Impact

AbstractNew physics frameworks like the next-to-minimal supersymmetric standard Model and the Next-to-2-Higgs-doublet Model contain three neutral CP-even Higgs bosons. It is possible for the heavier two of these states to have masses identical to each other, which can result in a sizeable quantum interference between their propagators in processes they mediate. For both these models, we study the impact of such interference on the pair-production of the lightest of the three scalars, which we identify with the observed 125 GeV Higgs boson, in the gluon-fusion channel at the large hadron collider (LHC). We find that the inclusion of these effects can substantially alter the cross section, compared to its value when they are ignored, for this process. Our results illustrate the importance of taking possible quantum interference effects into account not only when investigating the phenomenology of extended Higgs sectors at the future Run(s) of the LHC, but also when imposing its current exclusion bounds on the parameter spaces of these models.

scholarly journals Quantum Interference Effects in Resonant Raman Spectroscopy of Single- and Triple-Layer MoTe2 from First-Principles

Nano Letters ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 2381-2388 ◽  
Author(s):  
Henrique P. C. Miranda ◽  
Sven Reichardt ◽  
Guillaume Froehlicher ◽  
Alejandro Molina-Sánchez ◽  
Stéphane Berciaud ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
First Principles ◽  
Quantum Interference ◽  
Interference Effects ◽  
Triple Layer ◽  
Resonant Raman

Mechanically-Tunable Quantum Interference in Ferrocene-Based Single-Molecule Junctions

2020 ◽  
Author(s):  
María Camarasa-Gómez ◽  
Daniel Hernangómez-Pérez ◽  
Michael S. Inkpen ◽  
Giacomo Lovat ◽  
E-Dean Fung ◽  
...  
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Degrees Of Freedom ◽  
Building Blocks ◽  
Ferrocene Derivative ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
The Impact ◽  
D Orbitals

Ferrocenes are ubiquitous organometallic building blocks that comprise a Fe atom sandwiched between two cyclopentadienyl (Cp) rings that rotate freely at room temperature. Of widespread interest in fundamental studies and real-world applications, they have also attracted<br>some interest as functional elements of molecular-scale devices. Here we investigate the impact of<br>the configurational degrees of freedom of a ferrocene derivative on its single-molecule junction<br>conductance. Measurements indicate that the conductance of the ferrocene derivative, which is<br>suppressed by two orders of magnitude as compared to a fully conjugated analog, can be modulated<br>by altering the junction configuration. Ab initio transport calculations show that the low conductance is a consequence of destructive quantum interference effects that arise from the hybridization of metal-based d-orbitals and the ligand-based π-system. By rotating the Cp rings, the hybridization, and thus the quantum interference, can be mechanically controlled, resulting in a conductance modulation that is seen experimentally.<br>

scholarly journals Resonance and antiresonance in Raman scattering in GaSe and InSe crystals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Osiekowicz ◽  
D. Staszczuk ◽  
K. Olkowska-Pucko ◽  
Ł. Kipczak ◽  
M. Grzeszczyk ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Temperature Effect ◽  
Band Gap ◽  
Raman Spectra ◽  
Quantum Interference ◽  
Optical Band Gap ◽  
Phonon Coupling ◽  
Phonon Modes ◽  
Electron Phonon Coupling ◽  
Resonant Raman

AbstractThe temperature effect on the Raman scattering efficiency is investigated in $$\varepsilon$$ ε -GaSe and $$\gamma$$ γ -InSe crystals. We found that varying the temperature over a broad range from 5 to 350 K permits to achieve both the resonant conditions and the antiresonance behaviour in Raman scattering of the studied materials. The resonant conditions of Raman scattering are observed at about 270 K under the 1.96 eV excitation for GaSe due to the energy proximity of the optical band gap. In the case of InSe, the resonant Raman spectra are apparent at about 50 and 270 K under correspondingly the 2.41 eV and 2.54 eV excitations as a result of the energy proximity of the so-called B transition. Interestingly, the observed resonances for both materials are followed by an antiresonance behaviour noticeable at higher temperatures than the detected resonances. The significant variations of phonon-modes intensities can be explained in terms of electron-phonon coupling and quantum interference of contributions from different points of the Brillouin zone.

scholarly journals Enhanced Rashba spin-orbit splitting inBi∕Ag(111)andPb∕Ag(111)surface alloys from first principles

2007 ◽  
Vol 75 (19) ◽  
Author(s):  
G. Bihlmayer ◽  
S. Blügel ◽  
E. V. Chulkov
Keyword(s):  
First Principles ◽  
Spin Orbit ◽  
Surface Alloys ◽  
Orbit Splitting ◽  
Rashba Spin ◽  
Spin Orbit Splitting

Quantum interference effects in percolated metal networks

1994 ◽  
Vol 194-196 ◽  
pp. 1109-1110 ◽  
Author(s):  
M.E. Gershenson ◽  
P.M. Echternach ◽  
H.M. Bozler ◽  
A.L. Bogdanov ◽  
B. Nilsson
Keyword(s):  
Quantum Interference ◽  
Interference Effects
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