Transition-metal oxides (TMO) are one of the most studied class of materials, as a consequence of their rich and exotic physical properties, mainly determined by the strong electronic correlations of the metal d electrons. In this thesis I discuss about a particular 5d compound, sodium iridates, where spin-orbit coupling Coulomb repulsion and bandwidth are in comparable energy scales. Furthermore, these systems are Mott insulators and present a zigzag antiferromagnetic transition below TN 15 K. Here we tackle the physics of sodium iridates by adopting a nonequilibrium viewpoint based on the use of ultrafast light pulses combined in the so-called pump-probe experimental configuration. The aim is to perturb the antiferromagnetic state of the system via the excitation with a pump pulse and to observe the ultrafast recovery of the ground state by means of a second delayed probe pulse. Specifically, we will measure the dynamics of the pump-induced reflectivity variation in the zigzag antiferromagnetic and normal states as a function of the probe energy and as a function of time delay between the pump and the probe pulses.

NON-EQUILIBRIUM STUDY OF CORRELATED HONEYCOMB IRIDATES WITH STRONG SPIN-ORBIT COUPLING / N. Nembrini ; supervisor: C. Giannetti ; coordinator: M. Bersanelli. UNIVERSITA' DEGLI STUDI DI MILANO, 2016 Feb 08. 28. ciclo, Anno Accademico 2015. [10.13130/nembrini-nicola_phd2016-02-08].

NON-EQUILIBRIUM STUDY OF CORRELATED HONEYCOMB IRIDATES WITH STRONG SPIN-ORBIT COUPLING.

N. Nembrini
2016

Abstract

Transition-metal oxides (TMO) are one of the most studied class of materials, as a consequence of their rich and exotic physical properties, mainly determined by the strong electronic correlations of the metal d electrons. In this thesis I discuss about a particular 5d compound, sodium iridates, where spin-orbit coupling Coulomb repulsion and bandwidth are in comparable energy scales. Furthermore, these systems are Mott insulators and present a zigzag antiferromagnetic transition below TN 15 K. Here we tackle the physics of sodium iridates by adopting a nonequilibrium viewpoint based on the use of ultrafast light pulses combined in the so-called pump-probe experimental configuration. The aim is to perturb the antiferromagnetic state of the system via the excitation with a pump pulse and to observe the ultrafast recovery of the ground state by means of a second delayed probe pulse. Specifically, we will measure the dynamics of the pump-induced reflectivity variation in the zigzag antiferromagnetic and normal states as a function of the probe energy and as a function of time delay between the pump and the probe pulses.
8-feb-2016
Settore FIS/03 - Fisica della Materia
GIANNETTI, CLAUDIO
BERSANELLI, MARCO RINALDO FEDELE
Doctoral Thesis
NON-EQUILIBRIUM STUDY OF CORRELATED HONEYCOMB IRIDATES WITH STRONG SPIN-ORBIT COUPLING / N. Nembrini ; supervisor: C. Giannetti ; coordinator: M. Bersanelli. UNIVERSITA' DEGLI STUDI DI MILANO, 2016 Feb 08. 28. ciclo, Anno Accademico 2015. [10.13130/nembrini-nicola_phd2016-02-08].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/362914
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