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Related Concept Videos

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Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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In circuit analysis, situations often arise where resistors are neither in series nor parallel configurations. To tackle such scenarios, three-terminal equivalent networks like the wye (Y) (Figure 1 (a)) or tee (T) and delta (Δ) (Figure 1 (b)) or pi (π) networks come into play. These networks offer versatile solutions and are frequently encountered in various applications, including three-phase electrical systems, electrical filters, and matching networks.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Development of a Topological-Insulator-Based Quantum Resistance Standard.

Ngoc Thanh Mai Tran1,2, Linsey K Rodenbach3, Jason M Underwood1

  • 1National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA.

IEEE Transactions on Instrumentation and Measurement
|October 9, 2024
PubMed
Summary
This summary is machine-generated.

This study characterizes the quantum anomalous Hall effect resistor using chromium-doped bismuth antimony telluride. Precision measurements were achieved by coupling the resistor to a programmable Josephson voltage standard without a magnetic field.

Keywords:
electrical resistance measurementmeasurement standardsprecision measurementstopological insulators

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Area of Science:

  • Condensed Matter Physics
  • Quantum Metrology

Background:

  • The quantum anomalous Hall (QAH) effect offers dissipationless conduction, a key property for quantum standards.
  • Integrating quantum electrical standards requires robust characterization and inter-device coupling.

Purpose of the Study:

  • To characterize a QAH effect resistor based on Cr-doped BiSbTe.
  • To demonstrate direct coupling of the QAH resistor to a programmable Josephson voltage standard (PJVS).
  • To perform precision measurements of QAH resistance at zero magnetic field.

Main Methods:

  • Fabrication and characterization of Cr-doped BiSbTe thin films exhibiting the QAH effect.
  • Experimental setup for direct coupling between the QAH resistor and a PJVS.
  • Precision resistance measurements under microwave biasing of the PJVS.

Main Results:

  • Successful characterization of the QAH effect in the Cr-doped BiSbTe material.
  • Demonstration of the QAH resistor's integration with a PJVS at zero magnetic field.
  • Precise measurement of QAH resistance influenced by microwave signals.

Conclusions:

  • The QAH effect resistor shows promise for quantum electrical metrology.
  • Direct coupling to PJVS enables advanced precision measurements.
  • This work contributes to the development of integrated quantum electrical standard systems.