摘要
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 nphase shifts and vortex-anti vortex 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.
基金
This work was supported by the Singapore Ministry of Education via AcRF Tier 3 Programme"Geometrical Quantum Materials"(MOE2018-T3-1-002)
AcRF Tier 2 grants(MOE2017-T2-1-040,MOE2017-T2-1-001 and MOE2018-T2-02-068)
Tier 1 grants(RG103/15 and RG113/16)
Q.X.gratefully acknowledges the funding support from the National Natural Science Foundation of China(No.12020101003)
a Tsinghua University start-up grant.
