Programme

P.9 -- Posters, VCTP-51

Date: Tuesday, 4 August 2026

Time: 09:30 - 10:30

Reservoir-controlled topological triplet excitonic condensations

Thi-Hong-Hai Do (1), Thi-Dieu-Thu Nguyen (1) and Van-Nham Phan (2,3)

(1) Department of Physics, Hanoi University of Mining and Geology; (2) Institute of Research and Development, Duy Tan University; (3) Faculty of Natural Sciences, Duy Tan University

We study nonequilibrium steady states of a two-dimensional electron-hole Hamiltonian with Rashba spin-orbit coupling, Zeeman splitting, Coulomb attraction, and band-selective tunnelling to independent fermionic reservoirs. Using self-consistent Hartree-Fock theory combined with steady-state quantum kinetic equations, we show that reservoir imbalance qualitatively reconstructs the topology of triplet excitonic condensates (ECs). At equilibrium, the emergence of the spin-down triplet EC converts the topological spin-up triplet EC into a topologically trivial coexistence phase. Away from equilibrium, the combined effect of bath chemical-potential imbalance and reservoir-coupling asymmetry stabilizes a topologically nontrivial coexistence of spin-up and spin-down triplet ECs. This topological sector shifts from negative to positive bath imbalance as the reservoir-coupling ratio is tuned through unity. Optical conductivity provides clear signatures through a two-peak longitudinal response and a chiral Hall signal. These results establish reservoirs as microscopic control fields for topological excitonic matter.

Presenter: Do Thi Hong Hai