Theoretical and Experimental Methods



Cluster View

Computational Techniques


TIMES researchers use a variety of computational methods to simulate and predict the results of various spectroscopic experiments. The methods include density functional theory and other materials specific methods, exact diagonalization and sparse matrix techniques, different flavors of quantum Monte Carlo, nonequilibrium Keldysh techniques, and dynamical mean-field theory and cluster extensions. These methods are developed for a number of different platforms including in-house computing resources and the resources of the National Energy Research Scientific Computing Center (NERSC).
IXS Scheme

X-ray Spectroscopy & X-ray Scattering


X-ray spectroscopic and scattering techniques provide important experimental probes for studying strongly correlated materials, giving access to dynamics in the charge and spin channels with chemical specificity. In inelastic techniques like RIXS or NIXS, photon-in/photon-out processes, the frequency shift and polarization change of the outgoing photon compared to the incoming photon provides information about the physics of charge transfer processes and dynamics associated with the electronic structure with momentum- and energy-dependence. Other methods, like x-ray absorption (XAS), provide complimentary information about the unoccupied electronic states that can give a more complete materials specific picture when combined with ARPES or x-ray emission spectroscopy.
tr-ARPES

Ultrafast Spectroscopy


Photoemission spectroscopy (PES) provides valuable information about single-particle dynamics in condensed matter systems and the technique recently has been extended to the time-domain (tr-PES) using pump-probe, femto-second techniques. These experiments have been able to provide new information on electron dynamics directly in the time domain. New information also has become available from time domain experiments conducted using different x-ray scattering methods and pump-probe optical spectroscopies.

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Upcoming/Recent Events

  • ALS User Meeting
    October 2-4, 2018
    Lawrence Berkeley National Laboratory, Berkeley CA, USA
  • 2018 SSRL/LCLS Users' Meeting
    September 25-28, 2018
    SLAC National Accelerator Laboratory, Menlo Park CA, USA
  • M2S 2018
    August 19-24, 2018
    Beijing, China
  • CCP2018
    July 29 - August 2, 2018
    University of California - Davis, Davis CA, USA

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