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Related Concept Videos

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...
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...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
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...

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Updated: Jun 30, 2026

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
07:12

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Published on: August 28, 2018

Two-Dimensional Topological Insulators: Promises, Challenges, and Future Perspectives.

Yande Que1, Amit Kumar1, Bent Weber1

  • 1School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|June 29, 2026
PubMed
Summary
This summary is machine-generated.

The quantum spin Hall (QSH) effect offers promising low-power electronics, but its applications are limited by materials and conditions. Future progress requires novel materials and engineered topological functionality for advanced devices.

Keywords:
2D topological insulatorquantum spin Hall effectspintronicstopological field‐effect transistortopological qubits

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Information Science

Background:

  • The quantum spin Hall (QSH) effect is a 2D topological phase with protected edge states.
  • It offers magnetic-field-free operation, spin-momentum locking, and tunable topology.
  • QSH is a promising platform for low-power electronics, spintronics, and quantum computation.

Purpose of the Study:

  • To critically reassess the field of QSH effect research.
  • To analyze material limitations and functional bottlenecks hindering technological translation.
  • To outline future directions for realizing QSH-based functionalities.

Main Methods:

  • Literature review and synthesis of existing research.
  • Critical analysis of material properties and device geometries.
  • Identification of challenges and proposed solutions for QSH applications.

Main Results:

  • Experimental QSH realizations are limited to specific materials and cryogenic temperatures.
  • Current QSH devices operate over restricted length scales.
  • Significant material and engineering challenges impede widespread QSH adoption.

Conclusions:

  • Future QSH progress necessitates novel material discovery.
  • Engineering topological functionality in large-gap, robust systems is crucial.
  • The QSH effect provides a foundational framework for next-generation devices.