We explore the properties of materials where quantum mechanics and strong interactions produce new states of matter
We study high-Tc cuprate superconductors. Those materials have the highest known superconducting critical temperature at ambient pressure. Their phase diagram features several baffling mysteries. The basic questions we are trying to answer are: what is the organizing principle of the phase diagram of high-Tc cuprates? what is the mechanism for high-Tc superconductivity? We use high magnetic fields to suppress superconductivity in order to reach and determine the nature of the electronic interactions at play in the phase diagram and in the pairing mechanism of those systems.
Quantum limit in semimetals
A magnetic field can induce unusual electronic ground states, such as the quantum Hall effect for a twodimensional
(2D) electron gas. In the limit where only the n = 0 Landau level is populated (the so-called quantum limit), electron interactions are responsible for the appearance of a variety of many-body ground states such as the fractional quantum Hall effect. In contrast to the 2D case, the electrons in the quantum limit of a three-dimensional (3D) gas has been poorly explored. We study semimetals, such as graphite, where the quantum limit can be achieved with current magnet technologies.