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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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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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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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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...
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Types Of Superconductors01:28

Types Of Superconductors

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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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Second-Order Circuits

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Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals.
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Improving Josephson junction reproducibility for superconducting quantum circuits: junction area fluctuation.

Anastasiya A Pishchimova1,2, Nikita S Smirnov1, Daria A Ezenkova1

  • 1FMN Laboratory, Bauman Moscow State Technical University, Moscow, 105005, Russia.

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Minimizing critical current variation in Josephson junctions is key for superconducting quantum circuits. This study optimized fabrication to reduce junction area non-uniformity, improving device reproducibility.

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Area of Science:

  • Superconducting quantum circuit fabrication
  • Quantum device engineering
  • Materials science for quantum technologies

Background:

  • Superconducting quantum circuits, including Josephson qubits and parametric amplifiers, are advancing rapidly.
  • Reproducibility of electrical properties across quantum chips is increasingly critical for complex devices.
  • Critical current (Ic) of Josephson junctions is a key parameter, directly impacting device performance.

Purpose of the Study:

  • To identify and address the dominant source of critical current non-uniformity in Josephson junctions.
  • To optimize the fabrication process for improved Josephson junction area reproducibility.
  • To demonstrate the impact of optimized fabrication on superconducting quantum circuit performance.

Main Methods:

  • Focused on Josephson junction area variation as the primary source of critical current non-uniformity.
  • Optimized the Josephson junction fabrication process.
  • Characterized junction resistance variation across different chip sizes and junction areas.
  • Analyzed linewidth standard deviation over a large number of fabricated junctions.

Main Results:

  • Achieved resistance variations of 9.8-4.4% and 4.8-2.3% across 22x22 mm² and 5x10 mm² chips, respectively.
  • Demonstrated a small linewidth standard deviation of 4 nm for junctions with areas from 0.008 to 0.12 μm².
  • Identified imperfections in the evaporation system as the main cause of junction area variation.
  • Validated the developed fabrication process on transmon qubits (T1 > 100 μs) and parametric amplifiers.

Conclusions:

  • Optimized Josephson junction fabrication significantly improves critical current reproducibility.
  • Addressing junction area variation, particularly due to evaporation system imperfections, is crucial for scalable quantum circuit manufacturing.
  • The developed process enables high-performance superconducting quantum devices, including qubits and amplifiers.