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Related Concept Videos

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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MOSFET: Enhancement Mode01:22

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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.
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MOSFET Amplifiers01:17

MOSFET Amplifiers

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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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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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Small-Signal Analysis of MOSFET Amplifiers

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In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
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Biasing of FET01:22

Biasing of FET

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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.
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Related Experiment Video

Updated: Apr 11, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Phonon-assisted gain in a semiconductor double quantum dot maser.

M J Gullans1,2, Y-Y Liu3, J Stehlik3

  • 1Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Physical Review Letters
|May 30, 2015
PubMed
Summary

We developed a microscopic model for a double-quantum-dot maser. Our findings reveal that phonon-assisted gain significantly contributes to the device's overall performance, explaining its masing behavior.

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Area of Science:

  • Quantum physics
  • Solid-state devices
  • Masers

Background:

  • Double-quantum-dot masers are a recent technological advancement.
  • Understanding the gain mechanisms in these devices is crucial for their development.

Purpose of the Study:

  • To develop a microscopic model for the double-quantum-dot maser.
  • To characterize the gain contributions within the device.

Main Methods:

  • Development of a microscopic theoretical model.
  • Analysis of stimulated emission processes.
  • Inclusion of phonon-assisted transitions (phonon sideband).

Main Results:

  • Identified simultaneous photon and phonon emission as a significant gain contributor.
  • Demonstrated that phonon-assisted gain typically dominates the overall gain.
  • The model successfully explains the masing phenomenon.

Conclusions:

  • Phonon-assisted emission is a key factor in double-quantum-dot maser operation.
  • The developed microscopic model accurately predicts experimental observations.
  • This work provides insights into optimizing maser performance.