Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session K05: Optically Driven Correlated Electron Systems: Theory
8:00 AM–11:00 AM,
Wednesday, March 7, 2018
LACC Room: 152
Sponsoring Unit: DCMP
Abstract: K05.00003 : Theory of pump-probe spectroscopy: Ultrafast laser engineering of ordered phases and microscopic couplings*
9:12 AM–9:48 AM
View Presentation Abstract
Intense femtosecond laser pulses, spanning a large range of photon energies from the X-ray to the THz regime, allow for controlled excitations ("pump") and monitoring ("probe") of the nonequilibrium dynamics of all the relevant microscopic degrees of freedom in solids. The field of ultrafast materials science is currently evolving from measuring time constants - for instance for the decay of hot electrons via phonon emission - towards ultrafast laser engineering of nonthermal phases of matter with novel properties. Notable examples include light-induced superconducting-like behavior , ultrafast switching to hidden ordered states , or time-reversal symmetry-broken Floquet states in topological insulators .
I will discuss recent theoretical progress in understanding these diverse phenomena from microscopic models and nonequilibrium simulations. I will show examples of light-enhanced superconductivity in an electron-phonon system from classical nonlinear phononics [4,5] and laser-controlled order competition between superconductivity and charge-density waves . I will discuss laser engineering of microscopic couplings in graphene  based on quantum nonlinear phononics [8,9]. Finally, I will show ab initio time-dependent density functional theory results for laser-engineered Hubbard U in NiO .
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*This work was supported by Deutsche Forschungsgemeinschaft through the Emmy Noether Programme (SE 2558/2-1).
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