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Related Concept Videos

Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
Fermi Level01:18

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Band Theory02:35

Band Theory

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.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Related Experiment Video

Updated: Jul 19, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Impurity band conduction in a high temperature ferromagnetic semiconductor.

K S Burch1, D B Shrekenhamer, E J Singley

  • 1Department of Physics, University of California, San Diego, California 92093-0319, USA. kburch@lanl.gov

Physical Review Letters
|October 10, 2006
PubMed
Summary

The Fermi energy in dilute magnetic semiconductors like Ga1-xMnxAs lies within a manganese-induced impurity band. This finding explains the material's unique electronic properties and metal-to-insulator transition.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Semiconductor Physics

Background:

  • Dilute magnetic semiconductors (DMS) exhibit unique electronic and magnetic properties.
  • Understanding the electronic structure of DMS like Ga1-xMnxAs is crucial for their technological applications.
  • Previous studies have explored the phase diagram and transport properties of Ga1-xMnxAs.

Purpose of the Study:

  • To investigate the band structure of Ga1-xMnxAs across its phase diagram.
  • To determine the location of the Fermi energy (EF) within the material.
  • To elucidate the mechanisms behind the metal-to-insulator transition and anomalous transport properties.

Main Methods:

  • Infrared spectroscopy
  • Optical spectroscopy
  • Analysis of frequency-dependent optical conductivity (sigma1(omega))
  • Carrier density variation

Main Results:

  • The Fermi energy (EF) was determined to reside within a manganese-induced impurity band (IB).
  • Changes in optical conductivity with carrier density strongly support EF lying in the IB.
  • A large effective mass (m*) for carriers was inferred from the optical conductivity analysis.

Conclusions:

  • The electronic structure of Ga1-xMnxAs is characterized by an impurity band hosting the Fermi energy.
  • The metal-to-insulator transition in this DMS is distinct from those in non-magnetic III-V semiconductors.
  • The study provides key insights into the anomalous transport phenomena observed in Ga1-xMnxAs.