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

Speaker: 
Dr. Alberto Nocera, Research Associate at SBQMI
Event Date and Time: 
Thu, 2018-09-20 14:00 - 15:00
Location: 
Hennings 318

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.

 

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