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Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Band Theory02:35

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Metal-Semiconductor Junctions01:24

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Electrical Transport01:29

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The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
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Transport in two-dimensional disordered semimetals.

Michael Knap1, Jay D Sau2, Bertrand I Halperin3

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA and ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|November 15, 2014
PubMed
Summary
This summary is machine-generated.

This study investigates transport in 2D semimetals, finding an upturn in resistivity at low temperatures due to electron-hole puddles. This behavior, explained by a simple physical model, is relevant for experimental realizations.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Two-dimensional (2D) semimetals exhibit unique electronic properties.
  • Potential fluctuations create electron and hole puddles in the transport layer.
  • Understanding transport phenomena in these systems is crucial for novel electronic applications.

Purpose of the Study:

  • To theoretically investigate charge transport in 2D semimetals.
  • To analyze the electric response of the electron-hole liquid under magnetic fields.
  • To explain the observed resistivity behavior at varying temperatures.

Main Methods:

  • Effective medium approximation for electric response calculations.
  • Resistor network mapping for complementary analysis.
  • Theoretical modeling of electron-hole liquid under magnetic fields.

Main Results:

  • An abrupt upturn in resistivity was observed as temperature decreased.
  • This upturn occurs in the presence of smooth disorder and weak electron-hole recombination.
  • No divergence in resistivity was found at zero temperature for overlapping bands.

Conclusions:

  • The study provides a theoretical explanation for the low-temperature resistivity upturn in 2D semimetals.
  • The findings are relevant to experimental observations in related systems.
  • A simple physical model elucidates the observed transport behavior.