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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...
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Metalloids

MetalloidsMetalloids are elements that exhibit properties of both metals and nonmetals.They are found along a zigzag line on the periodic table, acting as a boundary between metals and nonmetals. This zigzag line runs between Groups 13 and 17, separating the metallic elements on the left from the nonmetallic elements on the right. Metalloids are significant because they can sometimes conduct electricity, making them essential for electronic devices such as computers and phones. Some common...
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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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.
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Surface multiferroics in silicon enabled by hole-carrier doping.

Xiaoyu Xuan1, Wanlin Guo1, Zhuhua Zhang1

  • 1State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education and Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

Science Bulletin
|January 20, 2023
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Summary

We predict magnetic and electric orders coexist on silicon surfaces. This metal-free material exhibits multiferroic behavior, controllable by electric fields and strain engineering.

Keywords:
Ab initio calculationsCarrier dopingElectric dipoleFerromagnetismSi(0 0 1)

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Area of Science:

  • Surface Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • Coexistence of magnetic and electric orders is rare in materials.
  • Silicon surfaces offer a promising platform for novel electronic properties.

Purpose of the Study:

  • To predict and investigate the coexistence of magnetic and electric orders on Si(001) surfaces.
  • To explore the potential for multiferroic behavior in metal-free silicon.

Main Methods:

  • First-principles calculations were employed to model the electronic and magnetic properties.
  • Investigated the effects of hole-carrier doping and electric fields on surface states.

Main Results:

  • Ferromagnetism was predicted on hole-doped Si(001) surfaces due to spin-polarized surface states.
  • Surface magnetization was found to be controllable via electric polarization of Si dimers.
  • A transition between antiferroelectric and ferroelectric states was demonstrated, tunable by external electric fields.

Conclusions:

  • Clean Si(001) surfaces can exhibit coexisting magnetic and electric orders.
  • This system represents the first metal-free material displaying multiferroic behavior.
  • Strain silicon technology can further enhance the coupling between magnetic and electric orders.