Legacy Investigators

Robert Kiefl

Our main objective is to explore the novel magnetic and electronic properties of quantum materials using nuclear methods such as muon spin rotation and beta-detected NMR. In particular we are interested in finding out how their properties change in the bulk compared to the near surface region, near interfaces, and near a point charge such as the positive muon. For example, in some magnetic materials positive muon is expected to mimic a magnetic monopole or form a bound state with a polaron. We are also interested in studying how Li diffuses in battery electrode materials using nuclear tracer methods.

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Ian-Affleck

Ian Affleck

One method which we have applied with great success is a conformal field theory. While its original development was motivated by string theory, we have applied it to quantum spin chains, quantum wires, and various types of quantum impurity problems including the Kondo effect and junctions of quantum wires. We also use the renormalization group, which straddles high energy and condensed matter physics, and have frequently applied large scale numerical techniques to these problems, especially the Density Matrix Renormalization Group. Our collaborators include Steven White at UC Irvine Frederic Mila at École Polytechnique Fédérale de Lausanne and Charles Kane at U. Pennsylvania.

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Douglas Bonn; SBQMI, UBC Physics & Astronomy

Douglas Bonn

We synthesize ultraclean samples of quantum materials, particularly superconductors and topological materials, by bulk single crystal and film growth. These samples are then used for microwave spectroscopy, which reveals the low frequency conductivity spectrum, and scanning tunnelling spectroscopy, which provides spectroscopic capabilities at low temperatures with atom-scale spatial resolution.

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