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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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Superconductor01:24

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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 stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Route to Topological Superconductivity via Magnetic Field Rotation.

Florian Loder1,2, Arno P Kampf2, Thilo Kopp1

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Researchers propose rotating magnetic fields to achieve topological superconductivity in 2D s-wave superconductors. This method overcomes critical field limitations, enabling the realization of topological states in materials like LaAlO3/SrTiO3 interfaces.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Topological superconductivity verification is a significant experimental hurdle.
  • Conventional 2D s-wave superconductors in magnetic fields are candidates, but require fields exceeding critical limits (Hc2).
  • Strong Rashba spin-orbit coupling is necessary for topological states.

Purpose of the Study:

  • To propose a method for overcoming magnetic field limitations in achieving topological superconductivity.
  • To investigate the behavior of superconducting states under varying magnetic field strengths and orientations.
  • To identify suitable material systems for realizing topological superconductivity.

Main Methods:

  • Theoretical exploration of superconducting states under in-plane and out-of-plane magnetic fields.
  • Development of a three-band model tailored for specific material interfaces.
  • Analysis of the impact of magnetic field orientation on topological phase transitions.

Main Results:

  • A topological state, achievable with strong out-of-plane fields, persists even when the field is rotated into the superconducting plane.
  • This approach circumvents the need for magnetic fields exceeding the upper critical field (Hc2).
  • The proposed three-band model is applicable to the LaAlO3/SrTiO3 interface.

Conclusions:

  • Rotating the magnetic field into the superconducting plane offers a viable pathway to realize topological superconductivity.
  • The LaAlO3/SrTiO3 interface is a promising candidate system for experimental verification.
  • This work provides a crucial step towards the experimental realization and application of topological superconductors.