SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 68: Quantum Gases: Bosons V
Q 68.7: Talk
Friday, March 10, 2023, 16:00–16:15, B305
Pairing of 2D electromagnetic bosons under spin-orbit coupling and transverse magnetic field — •Sergueï Andreev — Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg
Exciton-polaritons in 2D semiconductors are electromagnetic bosons characterized by massive dispersion, polarization (spin) and pairwise interactions produced by the Coulomb forces between the constituent electrons and holes. Two bosons with opposite spins may form a bound state (biexciton). The bosons experience effective momentum-dependent magnetic fields due to the electron-hole exchange interaction and longitudinal-transverse splitting of the photon modes. These effective fields couple the spin-singlet biexciton to the continua in the triplet scattering channels. In this talk we shall discuss the ensuing phenomena for monolayer and bilayer semiconductors placed into an external transverse magnetic field (Faraday geometry). We predict biexcitonic halos possessing synthetic angular momenta Lz=± 2ℏ [1] and dissociation of a biexciton Bose-Einstein condensate into a superfluid current of excitons upon increasing the density. We point out affinity of these phenomena to the polarized exciton superstripe emerging at zero transverse magnetic field in the equilibrium many-body phase diagram of dipolar excitons in bilayers at sufficiently large inter-layer distances, where the biexciton becomes weakly bound [2].
References:
[1] S. V. Andreev, Phys. Rev. B 106, 155157 (2022)
[2] S. V. Andreev, Phys. Rev. B 103, 184503 (2021)