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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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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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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
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Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
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Superconducting proximity effect in flat band systems.

Somayeh Ahmadkhani1, Mir Vahid Hosseini1

  • 1Department of Physics, Faculty of Science, University of Zanjan, Zanjan 45371-38791, Iran.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 1, 2020
PubMed
Summary
This summary is machine-generated.

Proximity-induced superconductivity in a dice lattice is enhanced by a critical superconductor chemical potential. Below this critical value, proximity effects decrease, but superconducting pairing amplitude increases, affecting supercurrent flow.

Keywords:
Bogoliubov–de Gennes equationsJosephson junctionslattice models in condensed matterproximity effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconductivity enables unique quantum phenomena like the Josephson effect.
  • Flat band models, such as the dice lattice, exhibit exotic electronic properties relevant to superconductivity.

Purpose of the Study:

  • To theoretically investigate proximity-induced superconductivity and its inverse effect in a dice lattice flat band model.
  • To analyze the influence of Josephson junctions with s-wave pairing on superconductivity.

Main Methods:

  • Utilizing a self-consistent tight-binding Bogoliubov-de Gennes method.
  • Modeling a Josephson junction with superconducting leads and a normal region within a dice lattice.

Main Results:

  • A critical chemical potential for superconductors was identified, dependent on pairing interaction strength, which enhances proximity effects in undoped normal regions.
  • Below the critical chemical potential, proximity effects diminish irrespective of normal region doping, while superconducting pairing amplitude significantly rises.
  • Supercurrent flow is substantial when the superconductor chemical potential is below the critical value and vanishes when it exceeds it.

Conclusions:

  • The study reveals a tunable mechanism for controlling proximity-induced superconductivity and supercurrent in dice lattice systems.
  • Findings highlight the critical role of chemical potential in modulating superconducting properties and inter-material interactions.