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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.
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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.
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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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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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Floquet Engineering a Bosonic Josephson Junction.

Si-Cong Ji1, Thomas Schweigler1,2, Mohammadamin Tajik1

  • 1Vienna Center for Quantum Science and Technology (VCQ), Atominstitut, Technical University Wien, 1020 Vienna, Austria.

Physical Review Letters
|September 2, 2022
PubMed
Summary
This summary is machine-generated.

We demonstrate Floquet engineering to control tunnel coupling in bosonic quasicondensates. This enables precise manipulation of coherence and initial states in quantum systems.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Ultracold atoms

Background:

  • Bose gases in optical lattices
  • Tunnel coupling in quantum systems
  • Floquet engineering principles

Purpose of the Study:

  • Investigate Floquet engineering for controlling tunnel coupling
  • Initiate coherence between uncorrelated Bose gases
  • Prepare specific initial states in a sine-Gordon Hamiltonian

Main Methods:

  • Modulating energy difference in a tilted double-well potential
  • Utilizing Floquet driving to reestablish tunnel coupling
  • Characterizing equilibrium properties and relaxation dynamics

Main Results:

  • Precise control over tunnel coupling amplitude and phase achieved
  • Successful initiation of coherence between initially uncorrelated Bose gases
  • Preparation of diverse initial states in the emergent Hamiltonian

Conclusions:

  • Floquet engineering offers a robust method for controlling quantum system dynamics
  • The developed technique allows for tailored preparation of quantum states
  • Understanding relaxation dynamics is crucial for quantum control applications