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Related Concept Videos

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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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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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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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For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic...
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Related Experiment Video

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Topological Insulator Metamaterials.

Harish N S Krishnamoorthy1,2, Alexander M Dubrovkin1,2, Giorgio Adamo1,2

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore.

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Metamaterials enable subwavelength control of light, now extended to topological materials. This research explores exotic electronic features in topological metamaterials for novel photonic applications.

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Area of Science:

  • Photonics and Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Metamaterials enable subwavelength confinement of electromagnetic fields, engineering light-matter interactions in diverse material systems.
  • This approach has been extended to topological materials, offering new ways to access unique electronic band structure features.

Purpose of the Study:

  • To review topological material classes from a photonics perspective.
  • To discuss how exotic electronic features in topological metamaterials can lead to unconventional optical effects.
  • To explore dynamic control of these effects using external perturbations.

Main Methods:

  • Surveying topological material classes (insulators, semimetals, superconductors) for photonic applications.
  • Investigating crystal growth and lithographic structuring methods for topological metamaterials.
  • Analyzing the generation of spin-selective Dirac and hyperbolic plasmon polaritons.

Main Results:

  • Topological metamaterials exhibit exotic electronic features like spin-selective Dirac plasmon polaritons and hyperbolic plasmon polaritons.
  • These features give rise to unconventional magneto-optic, nonlinear, and circular photogalvanic effects.
  • External perturbations (electric/magnetic fields, optical pulses) allow dynamic control over these effects.

Conclusions:

  • Topological metamaterials offer a unique platform for exploring novel light-matter interactions.
  • They bridge nanophotonics, electronics, and spintronics, paving the way for advanced technologies.
  • This field holds significant potential for future technological advancements.