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Updated: Sep 5, 2025
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Confined Vacuum Resonances as Artificial Atoms with Tunable Lifetime
Rasa Rejali1, Laëtitia Farinacci1, David Coffey1
1Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands.
ACS Nano
|July 11, 2022
Summary
Researchers created artificial atoms using atomically precise potential wells on a copper surface. This new platform enables the study of electron-electron interactions in quantum simulations, opening doors for novel electronic devices.
Area of Science:
- Condensed Matter Physics
- Quantum Simulation
- Surface Science
Background:
- Artificial lattices are limited to non-interacting electron systems.
- Simulating electron-electron interactions is computationally intensive.
- A new platform is needed for quantum simulations involving electron interactions.
Purpose of the Study:
- To propose a novel platform for artificial matter construction.
- To enable the study of quantum phenomena with electron-electron interactions.
- To engineer custom atomic-scale resonant tunneling diodes.
Main Methods:
- Atom manipulation of surface vacancies on Cu(100) to create potential wells.
- Confinement of field-emission resonances (vacuum-localized discretized electronic states).
- Tuning electron state lifetime and control over state filling via potential modification.
Main Results:
- Demonstrated atomically precise potential wells hosting particle-in-a-box modes.
- Extended and tuned electron lifetimes in engineered states.
- Observed negative differential resistance due to interplay with bulk bands.
Conclusions:
- The proposed platform allows for quantum simulations with electron-electron interactions.
- Engineered states show tunable lifetimes and controllable filling.
- Potential applications in atomic-scale resonant tunneling diodes.
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