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Electrical transport near an Ising-nematic quantum critical point

Date: 2018-09-20
Time: 14:00
Venue: 物理所M253会议室
Speaker: Dr.Xiaoyu Wang

James Frank Institute in University of Chicago, USA


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.

Brief CV of Dr.Xiaoyu Wang:

I am currently a postdoctoral researcher in the James Frank Institute in University of Chicago, working on various topics in theoretical condensed matter physics. My primary interest is in strongly correlated electron systems, in particular those relevant to high temperature superconductivity. My expertise is in many body techniques as well as numerical Quantum Monte Carlo methods. I obtained PhD degree in physics from University of Minnesota in 2017, before which I graduated from Shanghai Jiao Tong University in 2010, with a bachelor’s degree in Electrical engineering.