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SUMMARY:Vestigial order in quantum materials - Prof. Jörg Schmalian\, Kar
 lsruhe Institute of Technology
DTSTART:20190613T131500Z
DTEND:20190613T141500Z
UID:TALK114529@talks.cam.ac.uk
CONTACT:Philipp C. Verpoort
DESCRIPTION:A hallmark of the phase diagrams of quantum materials is the e
 xistence of multiple electronic ordered states. In many cases those are no
 t independent competing phases\, but instead display a complex intertwinem
 ent. In this talk\, we focus on a realization of intertwined order with a 
 fluctuation-driven vestigial phase\, characterized by a composite order pa
 rameter. We demonstrate that this concept naturally explains the nematic s
 tate in iron-based superconductors and nematic superconductivity in doped 
 topological insulators. In addition\, we propose states of algebraic order
  in frustrated magnets and a mechanism for charge-4e superconductivity wit
 h half flux quanta\, accompanied by Majorana bound states in triplet super
 conductors. The formalism\, based on a symmetry classification of vestigia
 l order\, provides a general framework to understand the complexity of qua
 ntum materials. Electronic states with scalar and vector chiral order\, sp
 in-nematic order\, Ising-nematic order\, time-reversal symmetry-breaking o
 rder\, and algebraic vestigial order emerge from one underlying principle.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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