Quantum materials: ultrafast dynamics and control
To apply please click here
Materials with macroscopic orders resulting from quantum degrees of freedom are of fundamental interest and are widely used in sensors, memory devices and other applications. That makes crystalline ferroic materials an ideal “fruit fly” to test the ultrafast optical manipulation on. In particular, manipulation of their quantum states and associated dynamics are at the heart of many prospective applications, as in information storage and spintronics, light-emitting diodes or photovoltaics. Recent advent of femtosecond lasers and large-scale spectroscopy facilities enabled ultrafast experiments on a natural electronic timescale. This interdisciplinary workshop will bring together physicists, chemists and materials scientists to improve the simulation methodology for computing photoexcited dynamics in quantum materials. The proposed workshop is split into 3 sessions, which will (1) identify the classes of ferroic materials most suitable for ultrafast manipulation, (2) discuss photophysics of halide perovskite materials for optoelectronics, (3) address simulation methodologies for excited state dynamics and optical control.
In recent years optically-induced phase transitions [1-3], excitation of coherent phonons [7-10], switching of ferroelectric polarization [4-5] and optically enhanced superconductivity  were demonstrated. Existing computational methodologies include TDDFT, TD-GW+DMFT, surface hopping, Ehrenfest, hierarchy equations of motion. The workshop will target the development of efficient simulation protocols, adequate for modeling photoinduced switching of order parameters and the operation of halide perovskite-based LEDs and photovoltaics. Ample time for discussions will be allocated after every talk to stimulate the exchange of ideas. Each session will conclude with a brainstorming session of 30 min.
 Wall et al., Ultrafast disordering of vanadium dimers in photoexcited VO2, Science 362, 572 (2018);
 Nicholson et al., Beyond the molecular movie: Dynamics of bands and bonds during a photoinduced phase transition, Science 362, 821 (2018).
 Ideta et al., Ultrafast dissolution and creation of bonds in IrTe2 induced by photodoping Science Adv. 4, eaar3867 (2018).
 R. Mankowsky, A. von Hoegen, M. Först, and A. Cavalleri, Ultrafast Reversal of the Ferroelectric Polarization, Phys. Rev. Lett. 118, 197601 (2017).
 T. Li,et al., Optical control of polarization in ferroelectric heterostructures, Nature Communications 9, 3344 (2018).
 D. Nicoletti, E. Casandruc, Y. Laplace, V. Khanna, C. R. Hunt, S. Kaiser, S. S. Dhesi, G. D. Gu, J. P. Hill, and A. Cavalleri, Optically induced superconductivity in striped La2−xBaxCuO4 by polarization-selective excitation in the near infrared, Phys. Rev. B 90, 100503(R) (2014); R. Mankowsky, A. Subedi, M. Först et al., Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5, Nature 516, 71 (2014).
 L. Waldecker, R. Bertoni, H. Hübener, T. Brumme, T. Vasileiadis, D. Zahn, A. Rubio, and R. Ernstorfer, Momentum-Resolved View of Electron-Phonon Coupling in Multilayer WSe2, Phys. Rev. Lett. 119, 036803 (2017).
 M. J. Stern, L. P. René de Cotret, M.R. Otto,R.P. Chatelain,J.-P. Boisvert,M. Sutton, B.J. Siwick, Mapping momentum-dependent electron-phonon coupling and nonequilibrium phonon dynamics with ultrafast electron diffuse scattering, Phys. Rev. B 97, 165416 (2018).
 Y.-H. Cheng, F. Y. Gao, S. W. Teitelbaum, and K. A. Nelson, “Coherent Control of Optical Phonons in Bismuth,” Phys. Rev. B 96, 134302 (2017).
 O. L. Krivanek et al., “Vibrational Spectroscopy in the Electron Microscope,” Nature 514, 209 (2014).
Sergey Artyukhin ( Italian Institute of Technology ) - Organiser
Ivan Infante ( Italian Institute of Technology ) - Organiser
Gabriele Saleh ( Italian Institute of Technology (Genova) ) - Organiser