Spatio-temporal evolution of coherent polariton modes in ZnO microwire cavities at room temperature. Exciton–polariton Bose–Einstein condensation. Macroscopic two-dimensional polariton condensates. Electrical suppression of all nonradiative recombination pathways in monolayer semiconductors. Near-unity photoluminescence quantum yield in MoSs 2. Exciton–exciton interaction in transition-metal dichalcogenide monolayers. Quantized vortices and four-component superfluidity of semiconductor excitons. Spontaneous coherence in a cold exciton gas. Neutral exciton diffusion in monolayer MoS 2. Exciton diffusion in hBN-encapsulated monolayer MoSe 2. Quantum interference effect on exciton transport in monolayer semiconductors. Exciton diffusion in monolayer semiconductors with suppressed disorder. Transport dynamics of neutral excitons and trions in monolayer WS 2. Exciton diffusion in monolayer and bulk MoSe 2. Electron–exciton interactions in the exciton–polaron problem. Dark and bright exciton formation, thermalization, and photoluminescence in monolayer transition metal dichalcogenides. Exciton fission in monolayer transition metal dichalcogenide semiconductors. Room-temperature valley polarization in atomically thin semiconductors via chalcogenide alloying. Exciton radiative lifetime in transition metal dichalcogenide monolayers. Low-temperature photocarrier dynamics in monolayer MoS 2. Korn, T., Heydrich, S., Hirmer, M., Schmutzler, J. The electron–hole liquid in semiconductors. Temporal coherence of spatially indirect excitons across Bose–Einstein condensation: the role of free carriers. Theory of neutral and charged exciton scattering with electrons in semiconductor quantum wells. Collision broadening of two-dimensional excitons in a gaas single quantum well. Collective states of excitons in semiconductors. Observation of preformed electron–hole Cooper pairs in highly excited ZnO. Exciton correlations in coupled quantum wells and their luminescence blue shift. Hydrodynamic transport of excitons in semiconductors and Bose–Einstein condensation. Hydrodynamic behavior of triplet excitons. Equation of state of a Bose–Einstein system of particles with attractive interactions. Evidence for hydrodynamic electron flow in PdCuO 2. Observation of the Dirac fluid and the breakdown of the Wiedemann–Franz law in graphene. Negative local resistance caused by viscous electron backflow in graphene. Our theoretical simulations suggest that momentum is conserved and local equilibrium is achieved among excitons both these features are compatible with a fluid dynamics description of the exciton transport. The collective phase emerges above a critical laser power, in the absence of free charges and below a critical temperature (usually T c ≈ 150 K) approaching room temperature in hexagonal-boron-nitride-encapsulated devices. The exciton fluid flows over ultralong distances (at least 60 μm) at a speed of ~1.8 × 10 7 m s −1 (~6% the speed of light). Here, we show experimental evidence of a collective state of short-lived excitons in a direct-bandgap, atomically thin MoS 2 semiconductor whose propagation resembles that of a classical liquid as suggested by the nearly uniform photoluminescence through the MoS 2 monolayer regardless of crystallographic defects and geometric constraints. Excitons (coupled electron–hole pairs) in semiconductors can form collective states that sometimes exhibit spectacular nonlinear properties.
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