Speaker
Xiaoyu Wang
(James Frank Institute, University of Chicago)
Description
An electronic nematic order spontaneously breaks the
rotation symmetry of many body system, making various
physical properties anisotropic. It has been observed in
various systems, in particular the cuprate and iron-based
high temperature superconductors. In the vicinity of a
nematic quantum critical point — achieved by tuning some
external parameter such as pressure or doping — the physics
is described by that of low-frequency long-wavelength order
parameter fluctuations coupled to a Fermi surface. However,
due to the momentum-conserving nature of the induced
electron-electron interaction, the temperature dependence of
the resistivity near an Ising nematic QCP remains unclear.
In this talk, we shed light on the problem by incorporating
disorder and Umklapp process into the low-energy theory. Our
work can be viewed as solving an extended Boltzmann
equation, with a collision integral that accounts for
complicated multi-particle scattering processes important
near the QCP.
