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Superconductor01:24

Superconductor

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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...
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Types Of Superconductors01:28

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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...
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Semiconductors01:22

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.
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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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Types of Semiconductors01:20

Types of Semiconductors

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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.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Selective-Area-Grown Semiconductor-Superconductor Hybrids: A Basis for Topological Networks.

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We developed hybrid semiconductor-superconductor nanowires for topological quantum networks. Our platform shows a hard induced gap and tunable subgap states, demonstrating potential for scalable quantum computing applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Computing

Background:

  • Semiconductor-superconductor heterostructures are crucial for topological quantum computing.
  • Existing platforms face challenges in scalability and precise network design.

Purpose of the Study:

  • To introduce a novel platform for creating arbitrary semiconductor-superconductor networks.
  • To investigate the fundamental physical properties of these hybrid nanowires.
  • To demonstrate their potential for scalable topological quantum applications.

Main Methods:

  • Selective area growth of hybrid Indium Arsenide/Aluminum (InAs/Al) nanowires using molecular beam epitaxy.
  • Fabrication of complex networks with loops and branches.
  • Low-temperature electrical transport measurements.

Main Results:

  • Observation of a hard induced superconducting gap.
  • Unpoisoned 2e-periodic Coulomb blockade with temperature-dependent 1e features.
  • Overshoot in Coulomb peak spacing, indicating an oscillating discrete near-zero subgap state.
  • Evidence of strong spin-orbit coupling and a coherence length of several microns in a loop network.

Conclusions:

  • The developed InAs/Al nanowire platform enables the construction of arbitrary semiconductor-superconductor networks.
  • The observed properties are consistent with theoretical predictions for topological systems.
  • This platform holds significant promise for scalable topological quantum networks and other advanced applications.