Ultrafast dynamics in correlated materials and superconductors

26 October 2017
26 October 2017 - 16:00
Contatti: 
Dipartimento di Fisica, Segreteria
via Sommarive, 14 - 38123 Povo (Trento)
Tel. 
+39 0461 281504 - 1575 - 2042 - 1545
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+39 0461 281696

Venue: Room 208, Polo Scientifico e Tecnologico Fabio Ferrari

At: 16.00

  •   Prof. Claudio Giannetti - Università Cattolica Brescia

Abstract:

The short-range interactions among the electrons represent the universal underlying mechanism of many exotic properties of correlated 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] 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 main unsolved issues in the physics of superconducting copper oxides and I will discuss recent discoveries obtained via the ultrafast manipulation of the orbital occupation in these materials. I will discuss the existence of a high-temperature crossover at optimal doping between the physics of a doped Mott insulator to that of a more coherent metal [2,3] and its role in the onset of the low-temperature symmetry-breaking instabilities, such as the onset of charge-order. Finally, I will address the emergence of ultrafast coherent phenomena in transition-metal oxide (TMO) heterostructures [4] and the possible exploitation of quantum paths for the transport and collection of charge excitations in TMO-based few-monolayers devices.

References
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. S. Peli et al. Mottness at finite doping and charge instabilities in cuprates. Nature Physics 13, 806 (2017)
3. F. Cilento et al. Antinodal collapse in superconducting copper oxides driven by charge- transfer manipulation. arXiv:1703.03877 (2017)
4. M. Gandolfi et al. Emergent ultrafast phenomena in correlated oxides and heterostructures. Phys. Scr. 92, 034004 (2017)

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