Fractionalization in quantum dots Kondo blockade in molecular electronics Interplay of quantum topology and strong electron interactions

This is the research webpage of the theoretical nanoelectronics group at University College Dublin led by Dr Andrew Mitchell in the School of Physics.

When nanoscale components are incorporated into electronic circuits, the laws of quantum mechanics govern their basic properties. Striking phenomena such as entanglement and quantum interference can appear, and have no classical analogue. The next generation of miniaturized electronics will overcome the limitations of traditional design paradigms by exploiting the novel functionality of the nano.

In the theoretical nanoelectronics group at UCD we develop and apply state-of-the-art theoretical and computational techniques, working closely with experimental collaborators to study and direct development of new nanoelectronic devices. Our current focus is on semiconductor quantum dot devices and molecular electronics.

Recently, our research has explored the rich physics of 'charge-Kondo' semiconductor quantum dot devices. Such devices represent a new paradigm for designer nanophysics, providing a route engineer previously elusive states through quantum simulation of abstract models. They demonstrate complex non-perturbative many-body physics due to strong electronic interactions, with emergent fractionalized quasiparticles such as Majorana fermions and even Fibonacci anyons, near quantum critical points.

We also study single molecule junctions, where new possibilities arise from the complex interplay between quantum interference due to competing transport pathways, and the Kondo effect due to entanglement from strong electronic interactions. Our aim here is to treat strong interactions and quantum interference on an equal footing, to address the challenge of how to harness the robust and reproducible chemical complexity provided by nature in single molecule devices and for future advanced electronics. We have developed novel machine learning techniques to accomplish this.

Finally, we are interested in topological quantum matter and new materials, especially the interplay between topology and strong correlations.

For more information on our research projects, see the 'Research' page.
For a full list of our publications, see the 'Publications' page.

Check out recent talks by group members at the 'virtual' APS March Meeting conference:

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