Spontaneously coherent orbital coupling of counterrotating exciton polaritons in annular perovskite microcavities

Abstract

Exciton-polariton condensation is regarded as a spontaneous macroscopic quantum phenomenon with phase ordering and collective coherence. By engineering artificial annular potential landscapes in halide perovskite semiconductor microcavities, we experimentally and theoretically demonstrate the room-temperature spontaneous formation of a coherent superposition of exciton-polariton orbital states with symmetric petal-shaped patterns in real space, resulting from symmetry breaking due to the anisotropic effective potential of the birefringent perovskite crystals. The lobe numbers of such petal-shaped polariton condensates can be precisely controlled by tuning the annular potential geometry. These petal-shaped condensates form in multiple orbital states, carrying locked alternating π phase shifts and vortex–antivortex superposition cores, arising from the coupling of counterrotating exciton-polaritons in the confined circular waveguide. Our geometrically patterned microcavity exhibits promise for realizing room-temperature topological polaritonic devices and optical polaritonic switches based on periodic annular potentials.

Imaging and Controlling Photonic Modes in Perovskite Microcavities

“…[ 1,34 ] Via the microstructure design to control the photonic mode has been emerged in perovskite metasurface including the vortex nanolaser, polaritonic devices, and broadband antireflection nanostructure. [ 35–38 ] For a normal incident excitation, the photonic mode within the perovskite microcavity originates from the plane wave scattered from the crystal's edge into the perovskite microplate. This cavity‐boundary‐dependent scattering feature enables us to control the mode pattern both by the structure and light field.…”

Molding 2D Exciton Flux toward Room Temperature Excitonic Devices

“…[115,[121][122][123][124][125][126] More attractively, combining with microfabrication techniques, the artificial atoms with sizable scalability and controllability can be constructed as quantum simulators (such as ultracold atoms in optical lattices) operated at room temperature, by precisely introducing periodic potentials to trap exciton-polariton condensates. [127,128] For 1D micropillar array connected by channels in a perovskite microcavity (Figure 8c), the micropillars can induce a periodic potential of ≈400 meV to trap polaritons. [127] As depicted in Figure 8d, the polariton dispersion exhibits a broad distribution under the pump fluence of 0.7 P th , while condensing to selected states with a maximum gain in the lattice system for a high pump fluence of 2.0 P th .…”

Dynamics of Strong Coupling Between Free Charge Carriers in Organometal Halide Perovskites and Aluminum Plasmonic States

“…In a strong coupling regime, the excitation energy can be rapidly exchanged between SPs modes and materials with the formation of new hybrid states separated energetically by a Rabi splitting (Qian et al, 2021;Su et al, 2021;Zhao et al, 2021). In this regime, the new states are coherently superpositioned with intriguing phenomena, such as Bose-Einstein condensation (Plumhof et al, 2014) and thresholdless lasing (Ding and Ning, 2012;Wang et al, 2021). Among the variety of research, many types of excitonic materials, for instance, J-aggregates (Hao et al, 2011;, dye molecules (Wang et al, 2017), quantum dots , and two-dimensional material (Liu et al, 2016;Shan et al, 2019) are realized in a strong coupling regime with SPs.…”