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.

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 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.

The Impact of Endorsing the Belief in a Just World on Social Judgments

2013 ◽  
Vol 44 (3) ◽  
pp. 209-218 ◽  
Author(s):  
Benoît Testé ◽  
Samantha Perrin
Keyword(s):  
Social Desirability ◽  
Social Value ◽  
Social Utility ◽  
Western Society ◽  
Social Judgments ◽  
Just World ◽  
The Social ◽  
Main Effect ◽  
The Impact

The present research examines the social value attributed to endorsing the belief in a just world for self (BJW-S) and for others (BJW-O) in a Western society. We conducted four studies in which we asked participants to assess a target who endorsed BJW-S vs. BJW-O either strongly or weakly. Results showed that endorsement of BJW-S was socially valued and had a greater effect on social utility judgments than it did on social desirability judgments. In contrast, the main effect of endorsement of BJW-O was to reduce the target’s social desirability. The results also showed that the effect of BJW-S on social utility is mediated by the target’s perceived individualism, whereas the effect of BJW-S and BJW-O on social desirability is mediated by the target’s perceived collectivism.

Assessing the Impact of the Inlet Total Pressure Distortion on the Turbofan Thrust

2018 ◽  
pp. 19-30
Author(s):  
Yu. A. Ezrokhi ◽  
E. A. Khoreva
Keyword(s):  
Total Pressure ◽  
External Compression ◽  
Average Value ◽  
Inlet Distortion ◽  
Air Inlet ◽  
Engine Thrust ◽  
Relative Value ◽  
Main Effect ◽  
Pressure Recovery Factor ◽  
The Impact

The paper considers techniques to develop a mathematical model using a method of «parallel compressors». The model is intended to estimate the impact of the air inlet distortion on the primary parameters of the aero-engine.  The paper presents rated estimation results in the context of twin spool turbofan design for two typical cruiser modes of flight of the supersonic passenger jet. In estimation the base values σbase and the average values of the inlet ram recovery σave remained invariable. Thus, parametrical calculations were performed for each chosen relative value of the area of low-pressure region.The paper shows that an impact degree of the inlet distortion on the engine thrust for two modes under consideration is essentially different. In other words, if in the subsonic mode the impact assessment can be confined only to taking into account the influence of decreasing average values of the inlet total pressure, the use of such an assumption in the supersonic cruiser mode may result in considerable errors.With invariable values of the pressure recovery factor at the engine intake, which correspond to the speed of flight for a typical air inlet of external compression σbase, and average value σave, a parameter Δσuneven  has the main effect on the engine thrust, and degree of this effect essentially depends on a difference between σave and σbase values.

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>

When do job insecure employees adapt to change?

2019 ◽  
Vol 25 (3) ◽  
pp. 271-286 ◽  
Author(s):  
Kristi N. Lavigne ◽  
Victoria L. Whitaker ◽  
Dustin K. Jundt ◽  
Mindy K. Shoss
Keyword(s):  
Job Insecurity ◽  
Small Sample ◽  
Adaptive Performance ◽  
Work Behaviors ◽  
Content Type ◽  
Work Tasks ◽  
Main Effect ◽  
Low Levels ◽  
The Impact ◽  
The Relationship

Purpose The purpose of this paper is to examine the relationship between job insecurity and adaptive performance (AP), contingent on changes to core work tasks, which we position as a situational cue to employees regarding important work behaviors. Design/methodology/approach Employees and their supervisors were invited to participate in the study. Supervisors were asked to provide ratings of employees’ AP and changes to core tasks; employees reported on job insecurity. Findings As predicted, changes to core tasks moderated the relationship between job insecurity and AP. Job insecurity was negatively related to AP for those experiencing low levels of change, but was not related to AP for those experiencing high levels of change. Counter to expectations, no main effect of job insecurity was found. Research limitations/implications This study employed a fairly small sample of workers from two organizations, which could limit generalizability. Practical implications The study identifies changes to core tasks as a boundary condition for the job insecurity–AP relationship. Findings suggest that organizations may not observe deleterious consequences of job insecurity on AP when changes to core tasks are high. Originality/value Few researchers have examined boundary conditions of the impact of job insecurity on AP. Furthermore, inconsistent findings regarding the link between job insecurity and AP have emerged. This study fills the gap and expands upon previous research by examining changes to core tasks as a condition under which job insecurity does not pose an issue for AP.

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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