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Related Concept Videos

Switching of BJT01:22

Switching of BJT

364
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
364
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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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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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...
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Characteristics of MOSFET01:17

Characteristics of MOSFET

348
Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
348
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

325
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
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Biasing of FET01:22

Biasing of FET

218
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
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Updated: Jun 9, 2025

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Switching dynamics in Al/InAs nanowire-based gate-controlled superconducting switch.

Tosson Elalaily1,2,3,4, Martin Berke1,2, Ilari Lilja4,5

  • 1Department of Physics, Institute of Physics, Budapest University of Technology and Economics, Müegyetem rkp. 3., H-1111, Budapest, Hungary.

Nature Communications
|October 23, 2024
PubMed
Summary
This summary is machine-generated.

Researchers observed gate-induced fluctuations in superconducting nanowires, linking them to leakage current. This clarifies the origin of the gate-controlled supercurrent (GCS) effect, crucial for superconducting transistors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • The gate-controlled supercurrent (GCS) effect in superconducting nanostructures is key for developing superconducting transistors.
  • Recent studies debate the GCS effect's origin, with leakage-based scenarios being a focus.
  • Understanding the microscopic processes and timescales of the GCS effect is vital for its application.

Purpose of the Study:

  • To investigate the microscopic origin of the gate-controlled supercurrent (GCS) effect in Al/InAs nanowires (NWs).
  • To analyze the dynamics of superconducting-to-normal state switching induced by gate voltage.
  • To determine the transport mechanisms responsible for observed fluctuations.

Main Methods:

  • Observation of gate-induced two-level fluctuations between superconducting and normal states in Al/InAs NWs.
  • Noise correlation measurements to assess the relationship between fluctuations and leakage current.
  • Time-domain measurements to analyze the statistical properties (Poissonian) of the fluctuations.

Main Results:

  • Gate-induced two-level fluctuations were observed in Al/InAs nanowires.
  • Strong correlation found between these fluctuations and leakage current.
  • Fluctuations exhibit Poissonian statistics, consistent with stress-induced leakage current (SILC) via inelastic tunneling with phonon generation.

Conclusions:

  • The study identifies stress-induced leakage current (SILC) as the dominant mechanism behind the observed gate-induced fluctuations.
  • Findings provide a microscopic explanation for the gate-controlled supercurrent (GCS) effect in superconducting nanowires.
  • This research offers deeper insights into the switching dynamics of superconducting nanowires under strong gate voltage influence, aiding the development of superconducting electronics.