#### Alladi Ramakrishnan Hall

#### Engineering Floquet topological phases using periodic driving

#### Ranjani Seshadri

##### Ben Gurion University of Negev

*Abstract: Topological systems - both in equilibrium and driven out of equilibrium - have been a popular topic of research for the*

last several years. In this talk, I am going to use the Bernevig-Hughes-Zhang model - one of the earliest known two-dimensional

topological insulators - as an example to show how one can generate and/or manipulate topological phases using an external

perturbation that is periodic in time. In particular, I will be discussing how using an elliptically polarized light can generate phases

with topological invariants different from the equilibrium system. Moreover, the phases can be manipulated by varying the polarization

of incident light. I will also briefly discuss how one can generate higher-order topological phases using periodic driving which results

in states localized at the corners of a two-dimensional system.

References:

1. R. Seshadri, D. Sen, arXiv:2206.03473

2. R. Seshadri, A. Dutta, D. Sen, Phys Rev B 100, 115403

Done