Congratulations to Bohdan Khromets and Alex Currie for both successfully defending their MSc theses during the Fall 2021 term!
UPDATE: this paper is now published in Applied Physics Letters!
A preprint describing our recent work on single electron pumps in dopant-free GaAs 2D electron gases is now available on the arxiv. Here is the abstract:
We have realized quantized charge pumping using non-adiabatic single-electron pumps in dopant-free GaAs two-dimensional electron gases (2DEGs). The dopant-free III-V platform allows for ambipolar devices, such as p-i-n junctions, that could be combined with such pumps to form electrically-driven single photon sources. Our pumps operate at up to 0.95 GHz and achieve remarkable performance considering the relaxed experimental conditions: one-gate pumping in zero magnetic field and temperatures up to 5K, driven by a simple RF sine waveform. Fitting to a universal decay cascade model yields values for the figure of merit δ that compare favorably to reported modulation-doped GaAs pumps operating under similar conditions. The devices reported here are already suitable for optoelectronics applications, and with further improvement could offer a route to a current standard that does not require sub-Kelvin temperatures and high magnetic fields.
Stephen Harrigan's poster at the 2021 Canadian Association of Physicists' Virtual Congress titled 'Microwave Resonators for Global Control of Electron Spin Qubits ' won 1st place in the Division of Condensed Matter and Materials Physics and 3rd place at the conference overall. Congrats Stephen and co-authors! (link to CAP awards page)
Prof. Baugh served as editor and co-author for the article "Roadmap on quantum nanotechnologies", newly published by IOP Nanotechnology. Baugh, together with co-editor Dr. Arne Laucht (UNSW), conceived of the roadmap and invited nearly 30 expert co-authors to contribute. Here is the abstract:
"Quantum phenomena are typically observable at length and time scales smaller than those of our everyday experience, often involving individual particles or excitations. The past few decades have seen a revolution in the ability to structure matter at the nanoscale, and experiments at the single particle level have become commonplace. This has opened wide new avenues for exploring and harnessing quantum mechanical effects in condensed matter. These quantum phenomena, in turn, have the potential to revolutionize the way we communicate, compute and probe the nanoscale world. Here, we review developments in key areas of quantum research in light of the nanotechnologies that enable them, with a view to what the future holds. Materials and devices with nanoscale features are used for quantum metrology and sensing, as building blocks for quantum computing, and as sources and detectors for quantum communication. They enable explorations of quantum behaviour and unconventional states in nano- and opto-mechanical systems, low-dimensional systems, molecular devices, nano-plasmonics, quantum electrodynamics, scanning tunnelling microscopy, and more. This rapidly expanding intersection of nanotechnology and quantum science/technology is mutually beneficial to both fields, laying claim to some of the most exciting scientific leaps of the last decade, with more on the horizon."
Kyle successfully defended his PhD thesis, "Carbon nanotube electromechanical systems: Non-linear dynamics and self-oscillation", on April 21, 2020. Congrats Kyle!
Brandon successfully defended his PhD thesis, "Quantum dot devices in silicon and dopant-free GaAs/AlGaAs heterostructures", on Jan. 18, 2021. Congrats Brandon!
We are seeking highly motivated students for MSc or PhD positions to start Fall 2019. Projects are available on several semiconductor nano-electronics platforms:
Please contact Prof. Baugh baugh@uwaterloo.ca for more information.
Prof. Baugh quoted in the MIT Technology Review
Earlier press coverage from the announcement of our DRDC-funded project:
Record article (local paper)
"Network architecture for a topological quantum computer in silicon" has been published in IOP's Quantum Science and Technology journal. We introduce a design for a large-scale surface code quantum processor based on a node/network approach for semiconductor quantum dot spin qubits.
Prof. Baugh received a Research Leader Award from the Waterloo Institute for Nanotechnology on June 5, 2018. At left is WIN Executive Director Sushantra Mitra, and at right is VP Research Charmaine Dean.
Prof. Baugh explains how nanoelectronics devices like quantum dots can serve as platforms for scalable quantum information processors to visiting high school student Cassia Attard. (May 1, 2018)