Research
Superconducting Device Research
Research at NanoJunctions focuses on superconducting weak-link Josephson junctions.
Current work investigates GELB: controlled modulation of superconductivity using engineered magnetic structures on superconducting thin films.
Applications span superconducting memory, multi-state logic, and quantum devices.
From anomalous transport to engineered superconductivity
Origin of GELB
The GELB concept began with experimental observations in Nb/Ni hybrid superconducting films.
An anomalous R(T) behavior suggested superconductivity could be modified locally inside a continuous film.
This raised the central question behind NanoJunctions:
Can superconductivity itself become a device function?
Emergent Weak-Link Physics
Local suppression and emergent weak-link behavior
Transport measurements and modeling suggested that local suppression regions inside Nb/Ni superconducting films may generate emergent weak-link behavior.
Several theoretical frameworks were explored, including:
• Ambegaokar–Halperin (AH)
• Langer–Ambegaokar–McCumber–Halperin (LAMH)
• Kosterlitz–Thouless–Berezinskii (KTB)
Recent visualization work compares experimental R(T) data with theoretical weak-link transport models.
Modeling & Visualization
Visualization and modeling tools were developed to explore how local suppression regions may generate emergent weak-link behavior inside continuous superconducting films.
Comparisons between experiment and theory include AH transport modeling and temperature-dependent bridge formation.
From weak links to engineered superconducting devices
GELB Device Principles
GELB explores the idea that locally modified superconductivity can function as an engineered device element inside a continuous superconducting system.
Instead of relying only on conventional etched tunnel barriers, device functionality may emerge through geometry, materials coupling, and weakened superconducytivity.