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Related Concept Videos

Superconductor01:24

Superconductor

1.9K
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

1.7K
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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P-N junction01:11

P-N junction

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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...
1.7K
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.4K
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...
1.4K
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

907
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...
907
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

1.1K
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Quantum supercurrent transistors in carbon nanotubes.

Pablo Jarillo-Herrero1, Jorden A van Dam, Leo P Kouwenhoven

  • 1Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands. Pablo@qt.tn.tudelft.nl

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Summary
This summary is machine-generated.

Supercurrent flows through quantum dots, enabling Josephson coupling in discrete electronic states. This research explores quantum properties of carbon nanotubes for novel electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Computing
  • Nanotechnology

Background:

  • Superconducting leads significantly influence electronic transport in nanostructures.
  • Josephson coupling, enabling supercurrent flow, is typically observed in systems with continuous electronic states.
  • Previous studies focused on tunnel barriers, constrictions, normal metals, and semiconductors for Josephson coupling.

Purpose of the Study:

  • Investigate supercurrent flow through a discrete density of states (quantum dot).
  • Explore quantum properties of carbon nanotubes for Josephson coupling.
  • Analyze the correlation between normal state conductance and supercurrent in such systems.

Main Methods:

  • Utilized finite-sized carbon nanotubes as quantum dots between superconducting electrodes.
  • Employed a gate electrode to tune discrete energy states into resonance with the superconducting leads' Fermi energy.
  • Measured critical current modulation and normal state conductance.

Main Results:

  • Observed periodic modulation of the critical current due to tuning discrete energy states.
  • Found a non-trivial correlation between normal state conductance and supercurrent.
  • Demonstrated that the product of critical current and normal state resistance oscillates, unlike in continuous systems.

Conclusions:

  • Successfully demonstrated Josephson coupling through the discrete energy states of a quantum dot.
  • Carbon nanotubes serve as a viable platform for studying quantum transport phenomena.
  • The findings align with theoretical predictions and offer insights into quantum effects in nanodevices.