Next-generation crossover-free quantum Hall arrays with superconducting interconnections

Area of Science:

• Metrology and Measurement Science
• Condensed Matter Physics
• Quantum Phenomena

Background:

• Quantized Hall resistance (QHR) standards are crucial for electrical metrology.
• Traditional QHR standards face challenges with internal resistances and leakage currents at interconnections.
• Developing scalable and precise QHR arrays is an ongoing research goal.

Purpose of the Study:

• To present novel techniques for precision measurements of quantized Hall array resistance devices.
• To eliminate internal resistances and leakage currents in interconnected QHR devices.
• To achieve a scalable QHR array with high precision and stability.

Main Methods:

• Utilized superconducting, crossover-free, multiple interconnections.
• Employed graphene split contacts for device fabrication.
• Performed precision measurements on the developed QHR array devices.

Main Results:

• Successfully eliminated accumulation of internal resistances and leakage currents.
• Developed a scalable quantized Hall resistance array.
• Achieved nominal resistance values as precise and stable as single-element QHR standards.

Conclusions:

• The new techniques enable the creation of highly precise and stable scalable QHR arrays.
• Superconducting, crossover-free interconnections and graphene contacts are effective solutions for QHR metrology.
• This advancement offers a pathway to more robust and versatile QHR resistance standards.