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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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SUMMARY:CM Seminar: Topological Landau Theory\, Joseph Maciejko\, University of Alberta
DESCRIPTION:Speaker: Joseph Maciejko\, University of Alberta \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Topological Landau Theory \nAbstract: I will discuss a notion of topology “hidden” in Landau’s theory of phase transitions. When the order parameter comprises several components in the same irreducible representation of symmetry\, it can possess a nontrivial topology and acquire a Berry phase under the variation of thermodynamic parameters. To illustrate this idea\, I will focus on the superconducting phase transition of an electronic system with tetragonal symmetry and a two-component order parameter. From the time-dependent Ginzburg-Landau equation in the adiabatic limit\, we find that the order parameter acquires a Berry phase after a cyclic evolution of parameters. I will discuss two concrete models — one preserving time-reversal symmetry and one breaking it — and show that the nontrivial topology of the order parameter originates from thermodynamic analogs of gapless Dirac and Weyl points in the phase diagram. Finally\, I will propose an experimental realization of a thermodynamic Dirac point in chiral superconductors under strain\, and its detectable signature in the Josephson effect\, the geometry of vortices\, and the upper critical field.
URL:https://qmi.ubc.ca/event/cm-seminar-topological-landau-theory-joseph-maciejko-university-of-alberta/
LOCATION:BRIM 311\, 2355 East Mall\, Vancouver\, British Columbia\, V6T 1Z4\, Canada
CATEGORIES:CM Seminar
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