Thema der Dissertation:
Controlling Charge-Density-Wave Order with Current and Light
Controlling Charge-Density-Wave Order with Current and Light
Abstract: Technological progress is intimately linked to understanding and reliably controlling materials’ properties. For this task, materials with charge-density-wave (CDW) order are ideal model systems because they offer a highly tunable phase diagram. At the forefront of manipulating CDW order is the excitation with short pulses, which not only allows for fast switching, but can also drive the system out-of-equilibrium and give access to new states. In my defense talk, I will discuss the response of two model CDW systems, 1T-TiSe2 and 1T-TaS2, following excitation with light and current pulses, respectively. In the first half of the talk, using time- and angle-resolved photoemission spectroscopy (trARPES), I show how screening effects following strong optical excitation of TiSe2 can lead to a drastic renormalization of the electronic band structure in less than 55 fs. In the second half, using spatially resolved ARPES, I study the electronic structure of the current induced metastable state in 1T-TaS2 as well as its spatial evolution on the sample surface as a function of pulsing direction.
Zeit & Ort
30.01.2026 | 13:30
Seminarraum E1 (1.1.26)
(Fachbereich Physik, Arnimallee 14, 14195 Berlin)