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Joseph H. Thywissen

Joseph Thywissen’s work focuses on ultra-cold alkali gases, including both fermionic and bosonic species. Placed in optical lattices, cold atoms realize physical analogues of idealized models for strongly correlated electron systems. By experimentally studying these iconic condensed matter systems, he and his colleagues hope to learn whether the Hubbard model can explain high-temperature superconducting cuprates, and which models of magnetism give rise to spin liquids. In short, cold atoms may provide a kind of “half-way house” between theories of quantum matter and experimental measurements of complex materials. In Toronto, Thywissen and his colleagues have started down the long road to realizing these goals. They have cooled potassium 40 (a fermion) and rubidum 87 (a boson) to quantum degeneracy, and begun to explore their properties. His group uses microfabricated magnetic traps to accelerate the cooling cycle, and thereby reduce the technical demands of an ultra-cold atom experiment. The immediate goals of the experiment are to achieve the low temperatures necessary to observe interesting lattice physics: the Néel temperature is predicted to be approximately 5nK for potassium in a 400nm period lattice!


Fellow of the American Physical Society, 2014.

Premier's Research Excellence Award, 2004.

John Charles Polanyi Prize in Physics, 2003.

Ontario Distinguished Researcher Award, 2003.

Canada Research Chair, 2003.

Relevant Publications

G. J. A. Edge et al, "Imaging and addressing of individual fermionic atoms in an optical lattice," [arXiv:1510.04744]

Z. Yu et al, "Universal relations for a Fermi gas close to a p-wave interaction resonance," Phys. Rev. Lett., vol. 115, pp. 135304, 2015.

S. Trotzky et al, "Observation of the Leggett-Rice effect in a unitary Fermi gas," Phys. Rev. Lett., vol. 114, pp. 015301, 2015. as "Editor's Suggestion"

A. B. Bardon et al, "Transverse Demagnetization Dynamics of a Unitary Fermi Gas," Science, vol. 44, no. 722, 2014.

G. -B Jo et al, "Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms," Science, vol. 325, no. 1521, 2009.



Fellow Quantum Materials


University of TorontoDepartment of Physics


PhD Harvard University

B.Sc. Harvey Mudd College



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