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Semiconductors

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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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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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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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Biasing of Metal-Semiconductor Junctions01:27

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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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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
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Semiconductor Meta-Graphene and Valleytronics.

Praveen Pai1, Aron W Cummings2, Alexander Cerjan3

  • 1Department of Physics, University of Texas at Dallas, Richardson, Texas 75080, United States.

ACS Applied Materials & Interfaces
|January 15, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Artificial hexagonal boron nitride (AhBN), a novel quantum metamaterial, exhibits robust topological edge states resilient to disorder. These states show potential for low-dissipation, power-efficient microelectronics.

Keywords:
2D electron gasAnderson localizationantidot latticeartificial grapheneartificial quantum materialsvalley Hall effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Engineering

Background:

  • Nanopatterned semiconductor interfaces enable the creation of quantum metamaterials.
  • Artificial graphene exhibits unique electronic properties, including Dirac and saddle points.

Purpose of the Study:

  • To investigate the electronic properties of nanopatterned artificial graphene, specifically artificial hexagonal boron nitride (AhBN).
  • To determine the topological protection of one-dimensional edge states in AhBN against disorder.
  • To assess the potential of AhBN for low-energy microelectronic applications.

Main Methods:

  • Simulations of band structure and electronic transport.
  • Introduction of experimentally relevant disorder, such as charge puddles and geometric imperfections.
  • Calculation of valley Chern number to identify topological states.

    • Main Results:

    • Nanopatterning artificial graphene opens a Dirac band gap, forming artificial hexagonal boron nitride (AhBN).
    • AhBN hosts topological valley Hall states confined to domain walls.
    • These domain wall states demonstrate resilience against disorder, with localization lengths up to several microns.
    • Ribbon geometries with high aspect ratios are proposed to enhance low-dissipation channel effectiveness.

    Conclusions:

    • Artificial hexagonal boron nitride (AhBN) exhibits topologically protected edge states that are robust against common experimental disorders.
    • The findings highlight the potential of AhBN for developing low-dissipation, power-efficient microelectronic devices.
    • Further research into ribbon geometries can optimize the performance of these novel topological states.