Computing Resonant Inelastic X-Ray Scattering Spectra Using The Density Matrix Renormalization Group Method

Event Date:
2018-09-20T14:00:00
2018-09-20T15:00:00
Event Location:
Hennings 318
Speaker:
Dr. Alberto Nocera, Research Associate at SBQMI
Related Upcoming Events:
Condensed Matter Seminars
Event Information:

Over the past decade, Resonant Inelastic X-Ray Scattering spectroscopy (RIXS) has been established as a powerful technique to study the energy-momentum structure of charge, orbital, lattice, and magnetic excitations of strongly correlated materials.
The computation of RIXS spectra starting from model Hamiltonians is often a formidable task because of the absence of accurate many-body tools,
particularly when many orbitals are active. In most cases, exact diagonalization (ED) techniques are used which restricts clusters to a relatively small size.
In this talk, I will present a method for computing RIXS spectra in one-dimensional systems using the Density Matrix Renormalization Group Method.
With this new procedure, I computed the low-energy magnetic excitations observed in Cu L-edge RIXS for the challenging corner shared
CuO_4 chains on cluster sizes well beyond state-of-the-art ED techniques, using both multi-orbital and downfolded t-J model Hamiltonians.   
Finally, I will discuss the implications of the results for experiments and outline future directions of research.

Add to Calendar 2018-09-20T14:00:00 2018-09-20T15:00:00 Computing Resonant Inelastic X-Ray Scattering Spectra Using The Density Matrix Renormalization Group Method Event Information: Over the past decade, Resonant Inelastic X-Ray Scattering spectroscopy (RIXS) has been established as a powerful technique to study the energy-momentum structure of charge, orbital, lattice, and magnetic excitations of strongly correlated materials. The computation of RIXS spectra starting from model Hamiltonians is often a formidable task because of the absence of accurate many-body tools, particularly when many orbitals are active. In most cases, exact diagonalization (ED) techniques are used which restricts clusters to a relatively small size. In this talk, I will present a method for computing RIXS spectra in one-dimensional systems using the Density Matrix Renormalization Group Method. With this new procedure, I computed the low-energy magnetic excitations observed in Cu L-edge RIXS for the challenging corner shared CuO_4 chains on cluster sizes well beyond state-of-the-art ED techniques, using both multi-orbital and downfolded t-J model Hamiltonians.    Finally, I will discuss the implications of the results for experiments and outline future directions of research. Event Location: Hennings 318