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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

1.1K
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...
1.1K
Superconductor01:24

Superconductor

1.2K
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...
1.2K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.4K
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,...
1.4K
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

449
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...
449
Ferromagnetism01:31

Ferromagnetism

2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

322
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...
322

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Two-Dimensional Superconductivity at the Titanium Sesquioxide Heterointerface.

Lijie Wang1, Wenhao He1, Guangyi Huang1

  • 1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.

ACS Nano
|September 19, 2022
PubMed
Summary
This summary is machine-generated.

Researchers discovered exotic two-dimensional superconductivity at the interface of a Mott insulator and a semiconductor. This finding reveals a quantum metallic state preceding superconductivity, offering new avenues for materials research.

Keywords:
heterointerfaceheterostructure engineeringquantum metallic-like statesuperconductivitytwo dimensions

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Area of Science:

  • Solid state physics
  • Materials science
  • Condensed matter physics

Background:

  • Investigating exotic superconductivity in two dimensions is a key area in materials research.
  • Discovering novel interface superconductors with high transition temperatures (Tc) presents significant experimental challenges.

Purpose of the Study:

  • To experimentally observe and characterize two-dimensional superconductivity at the interface between a Mott insulator and a polar semiconductor.
  • To explore the nature of the quantum metallic state observed near the superconducting transition.

Main Methods:

  • Fabrication of heterostructures combining Ti2O3 (Mott insulator) and GaN (polar semiconductor).
  • Experimental measurement of electrical transport properties at cryogenic temperatures to identify superconductivity and metallic states.

Main Results:

  • Observation of two-dimensional superconductivity with a transition temperature (Tc) up to 3.8 K at the Ti2O3/GaN interface.
  • Identification of a quantum metallic-like state as a precursor to superconductivity upon decreasing temperature.

Conclusions:

  • The Ti2O3/GaN interface hosts emergent two-dimensional superconductivity.
  • The observed quantum metallic state highlights unique phenomena at oxide/semiconductor heterointerfaces.
  • Heterostructure engineering offers a promising route to explore and utilize emergent quantum phenomena.