Identifying mechanisms of quantum nematic transitions from the dynamic susceptibility

Klein, Avi
2018-05
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Identifying mechanisms of quantum nematic transitions from the dynamic susceptibility

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2018-05

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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.

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Correlated Electron Systems - Novel Developments Workshop 2018

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Klein, Avi. (2018). Identifying mechanisms of quantum nematic transitions from the dynamic susceptibility. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/197537.

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