Rice University logo
 
 
 
 

AMO - SPIN IMBALANCE IN A 2D FERMI-HUBBARD SYSTEM

Seminar

Physics & Astronomy

By: Waseem Bakr
From: Princeton University
When: Thursday, March 23, 2017
4:00 PM - 5:00 PM
Where: 300 Brockman Hall for Physics
Abstract: Understanding the magnetic response of the normal state of the cuprates is considered a key piece in solving the puzzle of their high-temperature superconductivity. A simple model for exploring this physics is a two-dimensional Fermi-Hubbard system in an effective Zeeman field. I will report on an experimental study of this model using site-resolved measurements of a spin-imbalanced Fermi gas in an optical lattice. We observe short-range canted antiferromagnetism at half-filling with stronger spin correlations in the direction orthogonal to the magnetization. Away from half-filling the polarization of the gas exhibits non-monotonic behavior with doping for strong interactions, resembling the behavior of the magnetic susceptibility in the cuprates. The realization of lattice Fermi gases with spin-imbalance opens the door to studying exotic superconductivity in large magnetic fields.