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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

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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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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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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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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Types of Semiconductors01:20

Types of Semiconductors

1.8K
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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Non-ohmic Devices00:51

Non-ohmic Devices

1.5K
In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Bottom-up superconducting and Josephson junction devices inside a group-IV semiconductor.

Yun-Pil Shim1, Charles Tahan2

  • 11] Laboratory for Physical Sciences, College Park, Maryland 20740, USA [2] Department of Physics, University of Maryland, College Park, Maryland 20742, USA.

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Researchers propose creating superconducting devices from silicon or germanium. This novel approach could lead to new quantum computing technologies and fundamental physics discoveries.

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Area of Science:

  • Solid-state physics
  • Quantum computing
  • Materials science

Background:

  • Superconducting circuits offer flexibility for devices like sensors and quantum computers.
  • Epitaxial semiconductor devices, such as silicon spin qubits, provide excellent quantum properties in solid-state systems.
  • Merging these approaches could enable single-crystal superconducting devices fabricated from semiconductors.

Purpose of the Study:

  • To propose and analyze the feasibility of creating superconducting devices from precision hole-doped regions within silicon or germanium single crystals.
  • To explore the potential for 'bottom-up' superconductivity for advanced technological and physical applications.

Main Methods:

  • Theoretical analysis of superconducting properties in precision hole-doped silicon or germanium.
  • Modeling of essential superconducting components like wires, Josephson junctions, and superconducting quantum interference devices (SQUIDs).

Main Results:

  • Demonstrated the theoretical feasibility of superconducting wires and Josephson tunnel junctions within a silicon or germanium crystal.
  • Showcased the potential for creating superconducting quantum interference devices (SQUIDs) and qubits.
  • Analyzed the properties of this novel superconducting semiconductor material.

Conclusions:

  • Superconducting devices fabricated from doped silicon or germanium are theoretically achievable.
  • This 'bottom-up' superconductivity approach opens new avenues for improved or fundamentally different quantum technologies and physics.
  • The proposed method motivates further research into semiconductor-based superconductivity.