DATA Martedì 27 Novembre 2018 ORE 11:00
AULA: Querzoli, LENS

RELATORE Prof. Claudio Giannetti

ISTITUTO DI APPARTENENZA Interdisciplinary Laboratories for Advanced Materials Physics (i-LAMP) &Università Cattolica del Sacro Cuore, Dipartimento di Matematica e Fisica, Brescia

ABSTRACT

The short-range interactions among the electrons represent the universal underlying mechanism of many exotic properties of quantum materials, such as Mott insulating states, high-temperature superconductivity, intrinsic nanoscale electronic inhomogeneity, spontaneous charge-orbital-magnetic ordering. Recently, the use of ultrashort light pulses [1,2] has been introduced as a “non-conventional” control parameter to transiently manipulate the electronic occupation of bands and investigate the fundamental interactions that drive the relaxation towards the correlated ground state and the possible emergence of novel functionalities with no counterpart at equilibrium.
Here I will review the most recent discoveries in the field, such as the ultrafast manipulation of conductivity in unconventional superconductors and Mott insulators. I will discuss the intertwining between the intrinsic nanotexture and the dynamics of the insulator to metal transformation in a prototypical Mott insulator [3]. Finally, I will address the emergence of ultrafast coherent phenomena in transition-metal oxide (TMO) heterostructures [4]. These systems can be engineered at the atomic level, thus providing the platform to investigate the transport phenomena on timescales of the order of the intrinsic decoherence time of the charge excitations. I will discuss the possible exploitation of quantum paths for the transport and collection of charge excitations in TMO-based few-monolayers devices.

1. C. Giannetti et al. Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach. Advances in Physics, 65:2, 58-238 (2016)
2. A. Ronchi et al., Ultrafast orbital manipulation and Mott physics in multi-band correlated materials. Proc. SPIE 10530, 105300V (2018)
3. A. Ronchi et al. Nanoscale dynamics across the Mott transition in V2O3. arXiv:1807.03670 (2018)
4. M. Gandolfi et al. Emergent ultrafast phenomena in correlated oxides and heterostructures. Phys. Scr. 92, 034004 (2017)

Referente: Giacomo Roati