Quantum Nanostructures and
Nanofabrication Group

Prof. Karl K. Berggren

The frontier of information processing lies in nanoscience and nanotechnology research. At the nanoscale, materials and structures can be engineered to exhibit interesting new properties, some based on quantum mechanical effects. Our research focuses on developing nanofabrication technology at the few-nanometer length-scale. We use these technologies to push the envelope of what is possible with photonic and electrical devices, focusing in particular on superconductive and free-electron devices. Our research combines electrical engineering, physics, and materials science and helps extend the limits of nanoscale engineering.


New Publication “Impact of DC bias on weak optical-field-driven electron emission in nano-vacuum-gap detectors”
In this work, we investigate multiphoton and optical field tunneling emission from metallic surfaces with nanoscale vacuum gaps. Using time-dependent Schrödinger equation (TDSE) simulations, we find that the properties of... Read more >>
New Publication “Compact and Tunable Forward Coupler Based on High-Impedance Superconducting Nanowires”
Developing compact, low-dissipation, cryogenic-compatible microwave electronics is essential for scaling up low-temperature quantum computing systems. In this paper, we demonstrate an ultracompact microwave directional forward coupler based on high-impedance slow-wave... Read more >>
New Publication “Superconducting MoN thin films prepared by DC reactive magnetron sputtering for nanowire single-photon detectors”
We present a comprehensive study of molybdenum nitride (MoN) thin film deposition using direct current reactive magnetron sputtering. We have investigated the effect of various deposition conditions on the superconducting... Read more >>
New Publication “Enhancing the performance of superconducting nanowire-based detectors with high-filling factor by using variable thickness ”
Current crowding at bends of superconducting nanowire single-photon detector (SNSPD) is one of the main factors limiting the performance of meander-style detectors with large filling factors. In this paper, we... Read more >>
New Publication “Superconducting Nanowire Spiking Element for Neural Networks ”
As the limits of traditional von Neumann computing come into view, the brain’s ability to communicate vast quantities of information using low-power spikes has become an increasing source of inspiration... Read more >>

The nanocryotron: A superconducting-nanowire three-terminal electrothermal device