In this talk, I provide a pedagogical introduction to topolectrical circuits and non-Hermitian phenomena. Although topological phenomena have become a cornerstone of modern condensed matter physics and won the Nobel Prize for their discoverers in 2016, their manifestation in actual physical materials remains experimentally challenging. Topolectrical circuits provide a readily accessible experimental platform for emulating the spectral properties of arbitrary non-interacting lattice Hamiltonians, including topological systems, in desktop experiments based on simple electrical components such as capacitors, inductors, resistors, and operational amplifiers. At the same time, the introduction of non-Hermiticity into physical systems through, for example, dissipative loss or non-reciprocity has immensely enriched the physics exhibited by such systems by giving rise to, for example, the non-Hermitian skin effect (NHSE). I provide a simple introduction to the NHSE and show how it gives rise to size-dependent localization effects in a few physical systems.

bio of speaker：Dr. Siu Zhuo Bin completed his B.Sc. (Hons) and M.Sc. degrees at the Department of Physics of the National University of Singapore (NUS) in 2008 and 2010, respectively, and his Ph.D. degree at the NUS Graduate School for Integrative Sciences and Engineering under the supervision of A/Prof. Mansoor B. A. Jalil in 2015. He has been working as a Research Fellow in A/Prof. Jalil’s group since 2015 and was promoted to Senior Research Fellow in 2022. His recent research interests revolve around topological and non-Hermitian phenomena. He has published more than 80 journal articles in Communications Physics, Physical Review Research, and other journals.