SCES Webinar Series

Título: Vestigial orders in electronic correlated systems: nematicity and beyond

Abstract: A hallmark of the phase diagrams of  correlated electronic systems  is the existence of multiple electronic ordered states. In many cases,  they cannot be simply described as independent competing phases, but instead display a complex intertwinement. A prime example of intertwined states is the case of primary and vestigial  phases. While the 
former is  characterized by a multi-component order parameter, the  fluctuation-driven vestigial state is characterized by a composite order parameter formed by higher-order, 
symmetry-breaking  combinations of the primary order parameter.  This concept has been widely employed to elucidate nematicity in iron-based superconductors.  In this 
talk, I will  present a group-theoretical framework, supplemented by microscopic calculations,  that extends this notion to a variety of phases, providing a  general
classification of vestigial orders of unconventional superconductors and density-waves. Electronic states with scalar and vector chiral order,  charge-4e order,  spin-nematic 
order, Ising-nematic order, time-reversal symmetry-breaking order, and algebraic vestigial order emerge from  this simple  underlying principle.  I will  present  a  rich 
variety of  possible  phase diagrams  involving  the primary and  vestigial orders, and discuss  possible  realizations of these exotic composite orders in different materials, 
including the recently discovered twisted moiré systems. 

Participe pelo: 

Zoom:  https://us02web.zoom.us/j/4396875843?pwd=T0pwTFNyTk5majkxNW1mZWhneTBBdz09
ID da reunião: 439 687 5843
Senha de acesso: 660629

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