BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//UNIFR/WEBMASTER//NONSGML v1.0//EN
CALSCALE:GREGORIAN
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251127T111500
DTEND;VALUE=DATE:20251127T111500
UID:18862@agenda.unifr.ch
DESCRIPTION:Topological materials gather a lot of interest for their remarkable properties (very high\nmagnetoresistance, high carrier mobility…). Due to the strong intertwinement between\nthe electronic, structural, and topological degrees of freedom in these materials, a lightinduced\ncontrol of their structure would open the possibility to tune their properties and\ntopological phase. A first step towards this exciting possibility is to understand the carrier\nand phonon dynamics in such systems.\nThe development of the Terahertz Time Domain Spectroscopy (THz-TDS) technique has\nopened many possibilities to characterize modes in matter that were until then\ninaccessible (intraband carrier dynamics, phonon modes, magnons…). By integrating this\ntime-resolved technique into a pump-probe configuration, one can investigate the\nultrafast transient photoconductive response and carrier dynamics of a broad range of\nmaterials. I developed such set-up to conduct optical pump – THz probe measurements\non several samples.\nI will first present a study of photo-induced carrier dynamics in a low bandgap\nsemiconductor Indium Antimonide (InSb) and I will discuss and model the influence of\npump fluence on these dynamics. In a second part, I will report similar pump-probe\nmeasurements on the topological semi-metal zirconium pentatelluride (ZrTe5), that\nallowed the study of its ultrafast carrier dynamics. I will complement these results with a\nstudy of its structure’s dynamics conducted by time-resolved Raman spectroscopy.
SUMMARY:Carrier dynamics in semiconductor INSB and topological material ZRTE5, studied with ultrafast terahertz time-domain spectroscopy 
CATEGORIES:Séminaire
LOCATION:PER 08\, 0.51\, Chemin du Musée 3\, 1700 Fribourg
URL;VALUE=URI:https://agenda.unifr.ch/e/fr/18862
END:VEVENT
END:VCALENDAR