We use time- and energy-resolved optical spectroscopy to investigate the coupling of electron-hole excitations to the magnetic environment in the relativistic Mott insulator Na2IrO3. We show that, on the picosecond time scale, the photoinjected electron-hole pairs delocalize on the hexagons of the Ir lattice via the formation of quasimolecular orbital excitations and the exchange of energy with the short-range-ordered zigzag magnetic background. The possibility of mapping the magnetic dynamics, which is characterized by typical frequencies in the THz range, onto high-energy (1-2 eV) charge excitations provides a platform to investigate, and possibly control, the dynamics of magnetic interactions in correlated materials with strong spin-orbit coupling, even in the presence of complex magnetic phases.

Tracking local magnetic dynamics via high-energy charge excitations in a relativistic Mott insulator

AVELLA, Adolfo;
2016

Abstract

We use time- and energy-resolved optical spectroscopy to investigate the coupling of electron-hole excitations to the magnetic environment in the relativistic Mott insulator Na2IrO3. We show that, on the picosecond time scale, the photoinjected electron-hole pairs delocalize on the hexagons of the Ir lattice via the formation of quasimolecular orbital excitations and the exchange of energy with the short-range-ordered zigzag magnetic background. The possibility of mapping the magnetic dynamics, which is characterized by typical frequencies in the THz range, onto high-energy (1-2 eV) charge excitations provides a platform to investigate, and possibly control, the dynamics of magnetic interactions in correlated materials with strong spin-orbit coupling, even in the presence of complex magnetic phases.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4686306
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