2020/07/26 by S. V. Andreev
Physics and Astronomy · #Atomic physics #Biexciton #Binding energy #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Exciton #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Spin (aerodynamics) #Superfluidity #cond-mat.mes-hall #cond-mat.quant-gas #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.103.184503
published as Phys. Rev. B 103, 184503 (2021) · 7 pages, 3 figures
arxiv created 2020/07/26 · openalex publication_date 2021/05/05 · arxiv updated 2021/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider quantum phase transitions in a system of bright dipolar excitons which can form bound pairs (dipolar biexcitons). The biexciton energy is tuned from negative to positive values through the scattering threshold. At sufficiently large density an exciton superfluid transforms into a superfluid of biexcitons. With the average relative momenta of excitons in the pairs being beyond the light cone, the transition is accompanied by a reduction of the photoluminescence intensity. Effective magnetic fields due to the long-range exchange splitting of exciton states shift the position of the gap in the elementary excitation spectrum to a circle of degenerate minima in the \mathbitk space. Closing the gap results in the formation of exciton stripes polarized linearly along the direction of their translational symmetry. In the biexciton energy vs density phase diagram the novel phase intervenes between the dark biexciton and radiative exciton superfluids. We conclude that formation of a BCS-like biexciton condensate induces correlated alignment of the effective magnetic fields and excitonic spins. We outline important differences in the predicted mechanism from the phenomenon of spin-orbit-coupled Bose-Einstein condensation.