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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...
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...
Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
Conductors and Insulators01:19

Conductors and Insulators

Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter insulators. The atomic structures of materials determine whether they are conductors or insulators of electricity.
Most metals are conductors. Their atomic configuration is such that one or more electron(s) are loosely bound to the nucleus in each atom. Thus, a sea of mobile electrons are available in them, known as free electrons. Their easy...
Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
Equipotential Surfaces and Conductors01:16

Equipotential Surfaces and Conductors

For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic situation, if a...

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Updated: May 13, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

A natural topological insulator.

P Gehring1, H M Benia, Y Weng

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. p.gehring@fkf.mpg.de

Nano Letters
|February 27, 2013
PubMed
Summary
This summary is machine-generated.

Researchers discovered Kawazulite, a naturally occurring mineral, as a topological insulator. Its electronic properties rival synthetic materials, opening avenues for novel electronic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Mineralogy

Background:

  • Earth's crust and outer space offer technologically relevant materials.
  • Topological insulators are of significant interest for optoelectronic applications.
  • Novel materials discovery is crucial for advancing technology.

Purpose of the Study:

  • To identify and characterize naturally occurring topological insulators.
  • To evaluate the electronic properties of Kawazulite.
  • To explore the potential of minerals for advanced electronic applications.

Main Methods:

  • Mechanical exfoliation of Kawazulite mineral.
  • Characterization of electronic properties of Kawazulite flakes.
  • Analysis of bulk doping and carrier mobility.

Main Results:

  • Kawazulite, Bi2(Te,Se)2(Se,S), identified as a natural topological insulator.
  • Exfoliated Kawazulite flakes exhibit low bulk doping.
  • Surface state carrier mobility exceeds 1000 cm(2)/(V s) at low temperatures.

Conclusions:

  • Kawazulite's electronic properties are competitive with synthetic topological insulators.
  • Natural minerals offer a promising source for high-performance electronic materials.
  • Future research may uncover other minerals with superior electronic characteristics.