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Related Concept Videos

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

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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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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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...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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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.
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Inducing superconductivity in quantum anomalous Hall regime.

Yu Huang1,2,3, Yu Fu1,2,3, Peng Zhang4

  • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 18, 2024
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Researchers successfully fabricated a topological superconductor by carefully controlling the interface between a quantum anomalous Hall insulator and a conventional superconductor. This work clarifies previous experimental discrepancies and provides a guide for creating these novel quantum materials.

Keywords:
Chern insulatorinterface controltopological superconductor

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Area of Science:

  • Condensed matter physics
  • Quantum materials science

Background:

  • Topological superconductors are sought-after quantum materials with potential applications in fault-tolerant quantum computing.
  • Realizing topological superconductors via proximity effect requires precise control over the interface between quantum anomalous Hall insulators and conventional superconductors.
  • Previous experimental attempts faced challenges due to unaddressed issues like electrical shorts.

Purpose of the Study:

  • To successfully fabricate a topological superconductor by overcoming previous experimental limitations.
  • To investigate the role of interfacial coupling in the proximity-induced topological superconductivity.
  • To provide a clear fabrication guide and explain past experimental debates.

Main Methods:

  • Fabrication of heterostructures by interfacing quantum anomalous Hall insulators with conventional superconductors.
  • Experimental characterization using measurements of the conductance matrix over a wide magnetic field range.
  • Theoretical analysis to develop a phase diagram based on coupling limits.

Main Results:

  • The experimental results, specifically the conductance matrix, match the predicted fingerprint of a topological superconductor.
  • A phase diagram was successfully developed, illustrating three distinct regions based on coupling parameters.
  • The findings validate the feasibility of proximity-induced topological superconductivity and explain previous discrepancies.

Conclusions:

  • The study demonstrates a reliable method for fabricating topological superconductors through proximity effects.
  • The developed phase diagram offers crucial insights into the parameter space for achieving topological superconductivity.
  • This work provides a comprehensive guide for researchers aiming to synthesize topological superconductors.