Universität zu Köln

Novelli, Fabio ORCID: 0000-0002-0381-5585, Fausti, Daniele ORCID: 0000-0002-2142-9741, Reul, Julia, Cilento, Federico ORCID: 0000-0002-4121-1694, van Loosdrecht, Paul H. M., Nugroho, Agung A., Palstra, Thomas T. M., Grueninger, Markus and Parmigiani, Fulvio ORCID: 0000-0001-9529-7406 (2012). Ultrafast optical spectroscopy of the lowest energy excitations in the Mott insulator compound YVO3: Evidence for Hubbard-type excitons. Phys. Rev. B, 86 (16). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Revealing the nature of charge excitations in strongly correlated electron systems is crucial to understanding their exotic properties. Here we use broadband ultrafast pump-probe spectroscopy in the visible range to study low-energy transitions across the Mott-Hubbard gap in the orbitally ordered insulator YVO3. Separating thermal and nonthermal contributions to the optical transients, we show that the total spectral weight of the two lowest peaks is conserved, demonstrating that both excitations correspond to the same multiplet. The pump-induced transfer of spectral weight between the two peaks reveals that the low-energy one is a Hubbard exciton, i.e., a resonance or a nearly bound state between a doublon and a holon. Finally, we speculate that the pump-driven spin disorder can be used to quantify the kinetic energy gain of the excitons in a ferromagnetic environment.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Novelli, Fabio UNSPECIFIED orcid.org/0000-0002-0381-5585 UNSPECIFIED Fausti, Daniele UNSPECIFIED orcid.org/0000-0002-2142-9741 UNSPECIFIED Reul, Julia UNSPECIFIED UNSPECIFIED UNSPECIFIED Cilento, Federico UNSPECIFIED orcid.org/0000-0002-4121-1694 UNSPECIFIED van Loosdrecht, Paul H. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nugroho, Agung A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palstra, Thomas T. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueninger, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED orcid.org/0000-0001-9529-7406 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-480812
DOI:	10.1103/PhysRevB.86.165135
Journal or Publication Title:	Phys. Rev. B
Volume:	86
Number:	16
Date:	2012
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SUPERCONDUCTIVITY; LAVO3; SPIN Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48081