Group seminar at LMU and Zoom: Topological phases in two-dimensional systems

Yixiao Wang, ETH Zurich
Group seminar at LMU seminar room and Zoom
Thursday, July 27, 09:00 am (MEZ)

Abstract:

Different topological phases have been actively explored in various experimental platforms, including condensed matter, photonics, and cold atoms, becoming an important branch of quantum simulation. In this talk, we will delve into a two-dimensional time-independent topological model considering the quantum valley Hall effect. The model features rigorous half-quantization and violates the bulk-edge correspondence between the valley Chern number and the interface states. We will also discuss its experimental realization with classical electronic circuit networks. Besides the static topological matter, Floquet-engineered systems are extensively studied due to their enhanced manipulating capabilities and the emergence of anomalous topological phases. We will show a theoretical work on two-dimensional Floquet topological systems with two-tone driving in resonant and off-resonant modulation schemes. The external driving fields play the role of coupling separate bands and breaking symmetries, leading to the topological phase transition. Additionally, we will consider optical lattices as a possible experimental platform.