Dr. Xuekai Ma, AG Schumacher
What is the challenge of my research project? Why am I eager to do it?
Microcavity exciton-polaritons are half-light half-matter quasi-particles. They are composed of quantum well excitons and cavity photons and have strong nonlinearity. Under non-resonant excitation, they can undergo a non-equilibrium phase transition with similarities to Bose-Einstein condensation (BEC), potentially even up to room temperature.
Why did I choose this project?
One of the main aims of this project is to investigate the nonlinear phenomena and optical control of exciton-polariton condensates in semiconductor microcavities. As topological objects, vortices can be non-resonantly created by ring-shaped pumps and their topological charges can be optically controlled by either resonant or non-resonant pulses. The precise control of topological elements is significant for exploring the potential application of polaritonic devices in all-optical switching, information processing, storage, and communication.
- X. Ma and S. Schumacher, “Vortex Multistability and Bessel Vortices in Polariton Condensates”, Phys. Rev. Letts. 121, 227404 (2018).
- X. Ma, O. A. Egorov, and S. Schumacher, “Creation and Manipulation of Stable Dark Solitons and Vortices in Microcavity Polariton Condensates”, Phys. Rev. Letts. 118, 157401 (2017).
- X. Ma and S. Schumacher, “Vortex-vortex control in exciton-polariton condensates”, Phys. Rev. B 95, 235301 (2017).
- X. Ma, U. Peschel, and O. A. Egorov, “Incoherent control of topological charges in nonequilibrium polariton condensates”, Phys. Rev. B 93, 035315 (2016).