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HL: Fachverband Halbleiterphysik

HL 13: Poster I

HL 13.8: Poster

Montag, 18. März 2024, 15:00–18:00, Poster E

Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates — •Tobias Schneider¹, Wenlong Gao², Thomas Zentgraf^1,3, Stefan Schumacher^1,3,4, and Xuekai Ma¹ — ¹Physics dept. CeOPP, Paderborn University, Germany — ²EIT Institute for Advanced Study, Ningbo, China — ³Physics dept. PhoQS, Paderborn University, Germany — ⁴Wyant College of Optical Sciences, University of Arizona, Tucson, USA

Topological states are of great interest due to their robustness against perturbations, hence they have been widely investigated in many physical systems including microcavity exciton polaritons[1]. In this work, we explore topological states in exciton polariton condensates in our newly designed double-wave (DW) lattices[2]. Exciton polaritons are quasiparticles composed of excitons and photons in semiconductor microcavities and show strong repulsive nonlinearity. The 1D DW chains we proposed enable multiple types of edge states in both the linear and the nonlinear regime, in which they are shown to be multistable. The strong nonlinearity of polaritons can also lead to the formation of new types of edge states that originate from the bulk eigenstates, i.e. nonlinearity-enhanced edge localization. The 1D lattice can be expanded into a 2D lattice structure, with SSH like structures in the new dimension. The combination of the perpendicularly DW and SSH lattices allows for the formation of additional higher-order topological insulator states (0D corner states). These corner states are also shown to be multistable in the nonlinear regime.[1] S. Klembt et al., Nature 562, 552 (2018).[2] T. Schneider et al., arXiv:2303.12593 (2023).

Keywords: topology; nonlinear; exciton polariton; edge state; corner state