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TT: Fachverband Tiefe Temperaturen

TT 85: Focus Session: Emergent Phenomena in Driven Quantum Many-Body Systems (joint session DY/TT)

TT 85.2: Invited Talk

Thursday, March 15, 2018, 10:00–10:30, EB 107

Theory of pump-probe spectroscopy: Ultrafast laser engineering of ordered phases and microscopic couplings — •Michael Sentef — Max Planck Institut für Struktur und Dynamik der Materie (CFEL), Hamburg

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 towards ultrafast laser engineering of nonthermal phases of matter with novel properties. 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 [1] and laser-controlled order competition between superconductivity and charge-density waves [2]. I will discuss laser engineering of microscopic couplings in graphene [3] based on quantum nonlinear phononics [4]. Finally, I will show ab initio time-dependent density functional theory results for laser-engineered Hubbard U in NiO [5].

[1] M. A. Sentef et al., Phys. Rev. B 93, 144506 (2016). [2] M. A. Sentef et al., Phys. Rev. Lett. 118, 087002 (2017). [3] E. Pomarico et al., Phys. Rev. B 95, 024304 (2017). [4] M. A. Sentef, Phys. Rev. B 95, 205111 (2017). [5] N. Tancogne-Déjean et al., arXiv:1712.01067.

This work was supported by Deutsche Forschungsgemeinschaft through the Emmy Noether Programme (SE 2558/2-1).