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Biasing of Metal-Semiconductor Junctions01:27

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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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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Engineering double-well potentials with variable-width annular Josephson tunnel junctions.

Roberto Monaco1

  • 1CNR-ISASI, Institute of Applied Sciences and Intelligent Systems 'E. Caianello', Comprensorio Olivetti, 80078 Pozzuoli, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 9, 2016
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Summary
This summary is machine-generated.

Researchers created a tunable double-well potential for fluxons in Josephson tunnel junctions, a key step for developing new superconducting qubits. This system allows manipulation and readout of vortex states for quantum applications.

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Area of Science:

  • Superconductivity
  • Quantum Electronics
  • Non-linear Dynamics

Background:

  • Long Josephson tunnel junctions are non-linear transmission lines supporting fluxons and electromagnetic waves.
  • Josephson vortices are being explored as a novel superconducting qubit platform.
  • Controlling fluxon states is crucial for realizing these quantum devices.

Purpose of the Study:

  • To present a simple method for creating a tunable double-well potential for individual fluxons.
  • To investigate the control and readout mechanisms for fluxon states.
  • To analyze the system's potential for observing quantum mechanical effects.

Main Methods:

  • Fabrication of an elliptic annular Josephson tunnel junction with non-uniform width.
  • Utilizing an in-plane magnetic field to control potential well properties.
  • Applying current ramps for fluxon state manipulation.
  • Measuring vortex depinning current for state readout.
  • Developing a 1D sine-Gordon model for system analysis.

Main Results:

  • Demonstrated control over potential well distance and barrier height via magnetic field.
  • Showcased manipulation and readout of fluxon states using current ramps and magnetic fields.
  • Calculated fluxon rest-mass, Hamiltonian density, and phase space trajectories.
  • Analyzed the influence of junction geometry and parameters on potential properties.

Conclusions:

  • The proposed system offers a viable platform for creating and controlling fluxon states in a double-well potential.
  • The system's parameters can be tuned to meet requirements for observing quantum effects like discrete energy levels and tunneling.
  • This research advances the development of Josephson vortex-based superconducting qubits.