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Related Concept Videos

Mesh Analysis with Current Sources01:10

Mesh Analysis with Current Sources

Mesh analysis becomes simpler when analyzing circuits with current sources, whether independent or dependent. The presence of current sources reduces the number of equations required for analysis. Two cases illustrate this:
Current Source in One Mesh: The analysis process is straightforward when a current source is found in only one mesh within the circuit. Mesh currents are assigned as usual, with the mesh containing the current source excluded from the analysis. Kirchhoff's voltage law (KVL)...
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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Current Density

The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Kirchhoff's Current Law

In the realm of electrical engineering, physicist Gustav Robert Kirchhoff made a significant contribution in 1847 by introducing Kirchhoff's laws for electric circuit analysis. These laws, particularly Kirchhoff's Current Law (KCL), have become foundational principles in understanding and analyzing electrical circuits.
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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Where does the current flow in two-dimensional layered systems?

Saptarshi Das1, Joerg Appenzeller

  • 1Birck Nanotechnology Center & Department of ECE, Purdue University , West Lafayette 47907, Indiana, United States.

Nano Letters
|June 28, 2013
PubMed
Summary
This summary is machine-generated.

We mapped current flow in multilayer MoS2 transistors, finding it dynamically shifts between layers. This reveals unusual contact resistance, crucial for future 2D electronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Understanding carrier transport in multilayer two-dimensional (2D) systems is crucial for next-generation electronics.
  • Conventional models struggle to explain the behavior of complex 2D materials like MoS2.

Purpose of the Study:

  • To map the current distribution across individual layers in multilayer 2D systems for the first time.
  • To investigate the unusual contact resistance observed in multilayer MoS2 field-effect transistors.
  • To develop a model explaining carrier transport and current distribution in these systems.

Main Methods:

  • Experimental measurement of current distribution in multilayer MoS2 field-effect transistors.
  • Channel length scaling studies to extract contact resistance.
  • Development and application of a resistor network model incorporating Thomas-Fermi charge screening and interlayer coupling.

Main Results:

  • The "hot-spot" of current flow dynamically migrates between layers based on back gate bias.
  • An unusual contact resistance was observed, not explained by conventional models.
  • A large charge screening length (λMoS2 = 7 nm) was determined for MoS2, differing significantly from graphene (λgraphene = 0.6 nm).

Conclusions:

  • The dynamic current distribution and unique contact resistance in multilayer MoS2 are attributed to its large charge screening length.
  • The findings provide fundamental insights into carrier transport in 2D layered systems.
  • This research is vital for the future design and implementation of advanced electronic components based on 2D materials.