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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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...
305
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...
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P-N junction01:11

P-N junction

600
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

679
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Supercurrent in Bi4Te3 Topological Material-Based Three-Terminal Junctions.

Jonas Kölzer1,2, Abdur Rehman Jalil1,2, Daniel Rosenbach1,2

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Summary

This study explores Josephson junctions using topological insulators Bi4Te3 and superconductors. Researchers observed Josephson supercurrent coupling and Shapiro steps, indicating unique quantum phenomena in these novel devices.

Keywords:
Josephson junctionShapiro stepsmolecular beam epitaxyselective-area growththree-terminal junctiontopological insulator

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Electronics

Background:

  • Topological insulators (TIs) exhibit unique electronic properties with potential applications in quantum devices.
  • Josephson junctions are fundamental components in superconducting electronics and quantum information processing.
  • Understanding the interplay between superconductivity and topological properties is crucial for advancing quantum technologies.

Purpose of the Study:

  • To investigate the transport properties of a three-terminal Josephson junction fabricated with a topological insulator (Bi4Te3) and a superconductor (Nb).
  • To explore the coupling effects and dynamics in multi-terminal Josephson junctions based on topological insulators.
  • To analyze the influence of temperature, radio frequency irradiation, and magnetic fields on the junction's behavior.

Main Methods:

  • Fabrication of an in situ prepared three-terminal Josephson junction using Bi4Te3 and Nb.
  • Measurement of differential resistance as a function of two bias currents.
  • Numerical simulations using a resistively and capacitively shunted Josephson junction model.
  • Temperature-dependent transport measurements.
  • Radio frequency (RF) irradiation experiments to observe Shapiro steps.
  • Magnetic field-dependent measurements of switching currents.

Main Results:

  • Observation of extended areas of Josephson supercurrent and coupling effects between adjacent superconducting electrodes.
  • Numerical simulations successfully interpreted the observed junction coupling dynamics.
  • Temperature dependence consistent with previous studies on TI-based Josephson junctions.
  • Detection of integer and fractional Shapiro steps under RF irradiation, suggesting a skewed current-phase relationship.
  • Observation of Fraunhofer-like interference patterns in switching currents within a perpendicular magnetic field.

Conclusions:

  • The study demonstrates the feasibility of creating and characterizing multi-terminal Josephson junctions using topological insulators.
  • The observed phenomena, including coupling, Shapiro steps, and magnetic field response, highlight the unique physics governed by the interplay of superconductivity and topological properties.
  • These findings pave the way for novel superconducting devices and quantum applications leveraging topological insulator materials.