Wei-Sheng Lee (SIMES Seminar)

Date(s) - Feb 13 2015
11:00 AM - 12:00 PM

Shasta Room, Bldg. 40, Room 361


RIXS Studies on Collective Excitations in Cuprates Across the Antiferromagnetic- Superconductivity Phase Boundary

Wei-Sheng Lee

Staff Scientist, SIMES

High temperature superconductivity (HTSC) can emerge via doping charge carriers into the antiferromagnetic (AFM) ordered insulating copper oxides. To uncover the mysterious mechanism of HTSC, it is necessary to first reveal how magnetic, charge, lattice, and orbital degrees of freedom evolve from AFM to HTSC phase. While extensive effort has been spent on this, surprising new phenomena continue to be discovered. In this talk, I will discuss collective excitations in the electron-doped superconducting cuprates, Nd2-xCexCuO4, which were measured by utilizing momentum-resolved resonant inelastic x-ray scattering scattering (RIXS), an emerging powerful tool for studying correlated electron systems.  Surprising behaviours of collective modes across the AFM-SC phase boundary were observed and were different than its hole-doped counter-parts. Finally, I will also briefly discuss the exciting scientific opportunities that will be enabled by future RIXS instruments.