Skip to ContentSkip to Navigation
OnderzoekZernike (ZIAM)NewsSeminars

Lecture Matteo Rini

Roster

WhenWhere
13 November 2009 FWN-Building 5113.0201, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Matteo Rini
Affiliation: Institute for Transuranium Elements in Karlsruhe, Germany
Title: Femtosecond Spectroscopy from Terahertz to X-rays: Time-resolved Studies of Phase Transition Dynamics in Strongly Correlated Electron Systems
Date: Fri Nov 13, 2009
Start: 14.00 CHANGED!!
Location: FWN-Building 5116.0124 CHANGED!!
Host: Paul van Loosdrecht
Telephone: +31 50 363 8149

Abstract

One of the current scientific frontiers in physics and chemistry deals with the measurement of microscopic atomic, electronic and magnetic dynamics on femtosecond timescales. Ultrashort laser, electron and x-ray pulses are allowing for increasingly sophisticated measurements, capable of exciting and probing selectively different degrees of freedom (lattice, spin, orbital, charge) on the elementary timescale of atomic motion.

In this talk, I will discuss our recent contributions in this area, motivated by the effort to understand the non-equilibrium and coherent dynamics of complex solids. We control and interrogate such dynamics by deploying the full spectral range of modern femtosecond science, from Terahertz to X-rays. I will review our time-resolved studies on insulator-metal transitions in strongly correlated electron systems, including the spin-Peierls compound VO2 [1] and colossal magnetoresistive manganites [2]. Phase transition dynamics in these systems are studied by a combination of femtosecond visible-to-midinfrared pump-probe techniques, transport measurements and time-resolved X-ray spectroscopy. Finally, I will present our recent work that shows that an insulator-metal transition can be stimulated in manganites by selective excitation of vibrational degrees of freedom [2]. The ultrafast vibrational control of correlated-electron phases may provide new insights into the role played by lattice vibrations in determining the electronic properties of complex solids.

 

[1]. A. Cavalleri et al., Phys. Rev. Lett. 95, (2005) 067405.

[2]. M. Rini et al., Nature 449 (2007) pp. 72-74.

 

Last modified:22 October 2012 2.30 p.m.