Title
Identifying mechanisms of quantum nematic transitions from the dynamic susceptibility
Abstract
Several strongly correlated electronic materials, such as FeSe, are thought to manifest quantum
critical transitions to an electronic nematic state. In my talk, I will discuss an interesting feature
of the nematic QCP: its anisotropic (quadrupolar) nature implies the appearance of dynamical
fluctuations at finite frequencies but very long spatial scales. These fluctuations encode information
on the driving mechanism of the nematic transition: whether it involves an external degree of
freedom, such as spin fluctuations, coupled to the electronic charge, or internal charge degrees of
freedom (a Pomeranchuk instability). I will show that Raman data for FeSe1-xSx agrees with the
hypothesis of a Pomeranchuk instability. Finally, I will also describe how these nematic critical
fluctuations are ‘shaped’ by conservation laws (which are constraints on long spatial scales),
implying a fascinating interplay between classical and quantum scales.
Suggested Citation
Klein, Avi.
(2018).
Identifying mechanisms of quantum nematic transitions from the dynamic susceptibility.
Retrieved from the University of Minnesota Digital Conservancy,
https://hdl.handle.net/11299/197537.