Doctoral Thesis: Light-induced Non-equilibrium States and Phase Transitions in Quantum Materials

Thursday, July 18
10:00 am - 11:30 am


Thesis Supervisor(s): Prof. Nuh Gedik


  • Date: Thursday, July 18
  • Time: 10:00 am - 11:30 am
  • Category:
  • Location: 6C-442
Additional Location Details:

Light-induced emergent phenomena in quantum materials encompass a fascinating array of effects, including light-induced non-equilibrium states and light-induced phase transitions. Exploring these phenomena holds immense significance for several compelling reasons: (1) Novel phases: Light-induced non-equilibrium states include phases that do not exist in equilibrium conditions. (2) Insight into ground states: Light-induced phase transitions are closely linked to the ground states of materials. Investigating these transitions provides valuable insights into the fundamental characteristics of the ground state. (3) Engineering material properties: These phenomena serve as powerful tools for manipulating material properties. Through light excitations, we can potentially engineer the properties of materials, paving the way for innovative device architectures such as those utilizing light-controlled gating mechanisms. Within this broad spectrum of research, this thesis will specifically delve into three compelling cases: Floquet-Bloch states in graphene, light-induced insulator-metal transition in Sr2IrO4, and light-induced topological phase transition in Bi-doped PbSnSe. For these studies, we employed time- and angle-resolved photoemission spectroscopy (trARPES) and molecular beam epitaxy (MBE). Through in-depth investigation into these specific phenomena, this thesis seeks to contribute to the broader understanding of light-matter interactions in quantum materials.