7-11 July 2014
Africa/Johannesburg timezone
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Charge Density Waves Formation in 1T-TiSe2 Based on Pump-Probe Femtosecond Electron Diffraction

Presented by Ms. Aminat Oyiza SULEIMAN on 8 Jul 2014 from 17:10 to 19:00
Type: Poster Presentation
Session: Poster1
Track: Track C - Photonics
Board #: C.351

Abstract

1T-TiSe<sub>2</sub> is an inorganic crystal that has been studied for almost four decades as systems with strong electron-electron and electron-phonon correlations. The main attraction to this family of compound is its potential to exhibit a ground state phenomenon known as charge density waves (CDWs) whose detailed physical origin has not been controversially undetermined. We shall be using an ultrafast femtosecond laser based on pump-probe technique, namely ultrafast electron diffraction, to investigate some of the noble features associated with this crystal. A pump laser pulse excites the crystal from its ground state and the probe pulse (ultrashort electron pulse) takes the snapshot of this evolution of the lattice generating an electron diffraction pattern of the crystal. Hence the dynamical structural behaviour can be observed in time with a subpicosecond temporal resolution. Temperature increase in the crystal due to pump laser shall be characterised. Time-resolved measurements targeting the behaviour of the associated features shall be investigated as well as characterised. The suppression of the charge density wave order, electron-phonon coupling time, and the CDW recovery processes shall be determined.

Award

Yes

Level

MSc

Supervisor

Professor Heinrich Schwoerer/heso@sun.ac.za Stellenbosch University

Paper

No

Place

Room: D Ring ground level


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