scholarly journals Current Correlations in a Quantum Dot Ring: A Role of Quantum Interference

Entropy ◽  
2019 ◽  
Vol 21 (5) ◽  
pp. 527 ◽  
Author(s):  
Bogdan R. Bułka ◽  
Jakub Łuczak
Keyword(s):  
Correlation Functions ◽  
Quantum Interference ◽  
Cross Correlation ◽  
Destructive Interference ◽  
Quantum Interference Effect ◽  
Auto Correlation ◽  
Current Correlation ◽  
Relevant Role ◽  
Opposite Chirality

We present studies of the electron transport and circular currents induced by the bias voltage and the magnetic flux threading a ring of three quantum dots coupled with two electrodes. Quantum interference of electron waves passing through the states with opposite chirality plays a relevant role in transport, where one can observe Fano resonance with destructive interference. The quantum interference effect is quantitatively described by local bond currents and their correlation functions. Fluctuations of the transport current are characterized by the Lesovik formula for the shot noise, which is a composition of the bond current correlation functions. In the presence of circular currents, the cross-correlation of the bond currents can be very large, but it is negative and compensates for the large positive auto-correlation functions.

scholarly journals Optomechanically Induced Transparency

Science ◽  
2010 ◽  
Vol 330 (6010) ◽  
pp. 1520-1523 ◽  
Author(s):  
Stefan Weis ◽  
Rémi Rivière ◽  
Samuel Deléglise ◽  
Emanuel Gavartin ◽  
Olivier Arcizet ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Electromagnetically Induced Transparency ◽  
Destructive Interference ◽  
Probe Field ◽  
Optomechanical System ◽  
Light Pulses ◽  
Quantum Interference Effect ◽  
On Chip ◽  
Induced Transparency ◽  
Optomechanically Induced Transparency

Electromagnetically induced transparency is a quantum interference effect observed in atoms and molecules, in which the optical response of an atomic medium is controlled by an electromagnetic field. We demonstrated a form of induced transparency enabled by radiation-pressure coupling of an optical and a mechanical mode. A control optical beam tuned to a sideband transition of a micro-optomechanical system leads to destructive interference for the excitation of an intracavity probe field, inducing a tunable transparency window for the probe beam. Optomechanically induced transparency may be used for slowing and on-chip storage of light pulses via microfabricated optomechanical arrays.

scholarly journals The role of quantum interference in determining transport properties of molecular bridges

2004 ◽  
Vol 2 (3) ◽  
pp. 524-533 ◽  
Author(s):  
Kamil Walczak
Keyword(s):  
Quantum Interference ◽  
Molecular System ◽  
Tight Binding ◽  
Transmission Function ◽  
Molecular Devices ◽  
Binding Model ◽  
Quantum Interference Effect ◽  
Current Voltage ◽  
Essential Question

AbstractAn analytical approach to the electron transport phenomena in molecular devices is presented. The analyzed devices are composed of various molecular bridges attached to two semi-infinite electrodes. Molecular system is described within the tight-binding model, while the coupling to the electrodes is analyzed through the use of Newns-Anderson chemisorption theory. The current-voltage (I-V) characteristics are calculated through the integration of transmission function in the standard Landauer formulation. The essential question of quantum interference effect of electron waves is diseussed in three aspects: (i) the geometry of a molecular bridge, (ii) the presence of an external magnetic field and (iii) the location of chemical substituent.

Optimum Vibration Control of a Nonlinear Damper System under Multi-Axis Excitations

2013 ◽  
Vol 712-715 ◽  
pp. 1678-1681
Author(s):  
Zheng Lu
Keyword(s):  
Nonlinear System ◽  
Vibration Control ◽  
Correlation Functions ◽  
Cross Correlation ◽  
Plug Flow ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Control Performance ◽  
Auto Correlation ◽  
Different Types

This paper presents an investigation of the vibration control performance of a nonlinear damper system under multi-axis excitations, focusing on its optimum strategy. The nonlinear damper system is composed of a particle damper and a primary structure. Cross-correlation functions and auto-correlation functions are shown to be suitable means to interpret the physics involved in the behavior of such a nonlinear system. Using different types of random excitations, the optimum operating regions are all determined, within which particles move in a plug flow pattern and correlation functions decay much faster than that under the inefficient operating conditions.

Charge Transfer Complexation Boosts Molecular Conductance Through Fermi Level Pinning

2018 ◽  
Author(s):  
Kun Wang ◽  
Andrea Vezzoli ◽  
Iain Grace ◽  
Maeve McLaughlin ◽  
Richard Nichols ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Molecule ◽  
Quantum Interference ◽  
Transmission Function ◽  
Scanning Tunneling ◽  
Charge Transfer Complexes ◽  
Tunneling Microscopy ◽  
Quantum Interference Effect ◽  
Single Molecule Junctions ◽  
Charge Transfer Complexation

We have used scanning tunneling microscopy to create and study single molecule junctions with thioether-terminated oligothiophene molecules. We find that the conductance of these junctions increases upon formation of charge transfer complexes of the molecules with tetracyanoethene, and that the extent of the conductance increase is greater the longer is the oligothiophene, i.e. the lower is the conductance of the uncomplexed molecule in the junction. We use non-equilibrium Green's function transport calculations to explore the reasons for this theoretically, and find that new resonances appear in the transmission function, pinned close to the Fermi energy of the contacts, as a consequence of the charge transfer interaction. This is an example of a room temperature quantum interference effect, which in this case boosts junction conductance in contrast to earlier observations of QI that result in diminished conductance.<br>

FIDDLE. Simultaneous Indexing and Structure Solution from Powder Diffraction Data using a Genetic Algorithm and Correlation Functions

2019 ◽  
Author(s):  
Carmen Guguta ◽  
Jan M.M. Smits ◽  
Rene de Gelder
Keyword(s):  
Genetic Algorithm ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Correlation Functions ◽  
Cross Correlation ◽  
Simultaneous Optimization ◽  
Powder Diffraction Data ◽  
Structure Solution ◽  
Matching Technique

A method for the determination of crystal structures from powder diffraction data is presented that circumvents the difficulties associated with separate indexing. For the simultaneous optimization of the parameters that describe a crystal structure a genetic algorithm is used together with a pattern matching technique based on auto and cross correlation functions.<br>

Further study on collisional quantum interference effect in energy transfer within CO singlet–triplet mixed states

1996 ◽  
Vol 105 (19) ◽  
pp. 8661-8665 ◽  
Author(s):  
Xiangling Chen ◽  
Guohe Sha ◽  
Bo Jiang ◽  
Jinbao He ◽  
Cunhao Zhang
Keyword(s):  
Energy Transfer ◽  
Interference Effect ◽  
Quantum Interference ◽  
Mixed States ◽  
Quantum Interference Effect

scholarly journals The Role of Extracellular Vesicles as Shuttles of RNA and Their Clinical Significance as Biomarkers in Hepatocellular Carcinoma

Genes ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 902
Author(s):  
Eva Costanzi ◽  
Carolina Simioni ◽  
Gabriele Varano ◽  
Cinzia Brenna ◽  
Ilaria Conti ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Extracellular Vesicles ◽  
Tumor Metastasis ◽  
Biological Processes ◽  
Rna Molecules ◽  
Expression Of Genes ◽  
Non Coding Rna ◽  
Donor Cells ◽  
Relevant Role

Extracellular vesicles (EVs) have attracted interest as mediators of intercellular communication following the discovery that EVs contain RNA molecules, including non-coding RNA (ncRNA). Growing evidence for the enrichment of peculiar RNA species in specific EV subtypes has been demonstrated. ncRNAs, transferred from donor cells to recipient cells, confer to EVs the feature to regulate the expression of genes involved in differentiation, proliferation, apoptosis, and other biological processes. These multiple actions require accuracy in the isolation of RNA content from EVs and the methodologies used play a relevant role. In liver, EVs play a crucial role in regulating cell–cell communications and several pathophysiological events in the heterogeneous liver class of cells via horizontal transfer of their cargo. This review aims to discuss the rising role of EVs and their ncRNAs content in regulating specific aspects of hepatocellular carcinoma development, including tumorigenesis, angiogenesis, and tumor metastasis. We analyze the progress in EV-ncRNAs’ potential clinical applications as important diagnostic and prognostic biomarkers for liver conditions.

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