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Related Concept Videos

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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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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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.
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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Reducing charge noise in silicon quantum dots is key for scalable quantum computing. This study links host semiconductor uniformity to reduced noise, enabling higher spin qubit fidelity.

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Area of Science:

  • Quantum Computing
  • Semiconductor Physics

Background:

  • Charge noise in host semiconductors hinders spin-qubit performance and large quantum processor control.
  • Engineering gate-defined quantum dots for reduced charge noise is complex.

Purpose of the Study:

  • To investigate the link between global semiconductor disorder and local charge noise in quantum dots.
  • To systematically improve charge noise in 28Si/SiGe heterostructures.

Main Methods:

  • Measured local charge noise in quantum dots.
  • Measured global disorder in host semiconductors using macroscopic Hall bars.
  • Analyzed 5 nm thick 28Si quantum wells and 100 mm wafers.

Main Results:

  • Found that improved scattering properties and uniformity of the 2D electron gas correlate with reduced charge noise.
  • Achieved a minimum charge noise of 0.29 ± 0.02 μeV/Hz½ at 1 Hz.
  • Extrapolated noise reduction to nearly one order of magnitude improvement in CZ-gate fidelities.

Conclusions:

  • Demonstrated a connection between macroscopic semiconductor properties and microscopic charge noise.
  • Highlighted the importance of a clean, uniform crystalline environment for high-fidelity spin qubits.
  • Paved the way for integrating long-lived, high-fidelity spin qubits into larger quantum systems.