Antenna-Coupled Graphene Josephson-Junction Terahertz and Millimeter Wave Detector
Abstract
Highly-sensitive broadly-tunable detectors are needed for future multi-domain sensing and quantum-information systems. Layered graphene with magic twist-angle between 2 - 4 sheetsis superconducting below ~2 K. Demonstrated Josephson junctions in this material feature very high dynamic resistance at the maximum zero-voltage current. Biased at this current, a small microwave voltage across the junction shifts the voltage-current step, which results in a large DC output voltage. A suitable antenna driven by external radiation can source the enabling AC voltage across the junction. Detection by this non-thermal mechanism may be both fast and sensitive. Our calculations indicate a noise-equivalent detectable photon flux of 1 photon per 6ns. Additionally, there is a bolometric response, whose temperature coefficient of resistance we estimate to have the promisingly high value 300 percent/K. Design, fabrication, response, twist-angle tolerance, and characterization for antenna-coupled, superconducting-graphene,Josephson-junction detectors of mm-wave and THz radiation are reported.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 12, 2023
- Accession Number
- AD1226941
Entities
People
- Ami Rathod
- Anna C. Bowman
- Chris J. Fredricksen
- Coleman Cariker
- F. J. González
- Francisco Hernandez
- Kirsten L. Lina
- Masahiro Ishigami
- Michael S. Lodge
- Richard A Klemm
- Robert E. Peale