FisMat2017 - Submission - View

Abstract's title: Non-equilibrium phenomena in correlated materials
Submitting author: Claudio Giannetti
Affiliation: Università Cattolica del Sacro Cuore
Affiliation Address: via Musei 41, 25121 Brescia
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations:

The possibility of investigating the dynamics of solids on timescales faster than the thermalization of the internal degrees of freedom [1] has disclosed novel non-equilibrium phenomena that have no counterpart at equilibrium. Transition metal oxides (TMOs) provide an interesting playground in which the correlations among the charges in the metal d-orbitals give rise to a wealth of intriguing electronic and thermodynamic properties involving the spin, charge, lattice and orbital orders. Furthermore, the physical properties of TMOs 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.

Here, we review and discuss two paradigmatic examples of transient emerging properties that are expected to open new fields of research: i) the Mott-like reorganization of the high-energy electronic properties of copper oxides at the critical doping pcr≈0.16 [2]. We will argue that the underdoped correlated state constitutes the fertile ground for the onset of low-temperature symmetry-breaking instabilities, such as the onset of charge-order.  ii) the possible preservation of the electronic quantum coherence on timescales of the order of the collection time in few-atomic layer devices [3]. We will discuss the emergence of quantum-transport phenomena at ambient temperature in TMO-based heterostructures. 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 AOP (2017). DOI: 10.1038/NPHYS4112 [3] M. Gandolfi et al. Emergent ultrafast phenomena in correlated oxides and heterostructures. Physica Scripta 92, 034004 (2017).