Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A44: Polariton Condensates at Room Temperature and EquilibriumInvited
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Sponsoring Units: DCMP Chair: Peter Littlewood, University of Chicago Room: BCEC 210C |
Monday, March 4, 2019 8:00AM - 8:36AM |
A44.00001: Polaritons, a growing field of condensate studies Invited Speaker: David Snoke In this talk I will review the physics of Bose condensation of polaritons, sometimes called “superfluids of light,” and review recent experimental results, such as equilibrium condensation, long-distance propagation to the global ground state of a system, phase locking of spatially separated condensates, evidence for superfluidity, measurement of correlation functions, and propagation in quasi-one-dimensional systems. I will end with a discussion of some of the challenges and promises of room-temperature condensation of polaritons. |
Monday, March 4, 2019 8:36AM - 9:12AM |
A44.00002: Room temperature polariton condensate using a biologically produced fluorescent protein Invited Speaker: Malte Gather Organic materials offer attractive properties for solid-state lasers, including large oscillator strength, high exciton binding energy, spectral tunability, and compatibility with low-cost fabrication processes. However, despite impressive proof-of-principle demonstrations and dramatic improvements in performance, important fundamental limitations remain. Particular challenges are concentration quenching and bi-molecular exciton recombination, which limit the available gain under practical pumping conditions. For electrical pumping, there are further restrictions, including the low charge carrier mobility of most organic materials. Recently, it has been suggested that lasers operating in the regime of strong exciton-photon coupling may address some of these challenges. |
Monday, March 4, 2019 9:12AM - 9:48AM |
A44.00003: Room-temperature superfluidity of exciton-polaritons Invited Speaker: Stephane Kena-Cohen Two decades ago, R.Y. Chiao highlighted the analogy between the Gross-Pitaevskii equation describing weakly interacting Bose fluids and the nonlinear wave equation describing photons in a nonlinear cavity. One dramatic consequence of this correspondance is the possibility to obtain a superfluid state of light. Microcavity polaritons--quasiparticles that can behave as strongly interacting photons--are an ideal platform to observe such effects. We will describe our observations of superfluid polariton propagation at room-temperature in organic microcavities and efforts to find other material systems where similar effects can be observed at much lower powers. |
Monday, March 4, 2019 9:48AM - 10:24AM |
A44.00004: Equilibrium and Superfluidity in Polariton Condensates Invited Speaker: Marzena Hanna Szymanska In specially engineered light-matter structures, photons can be made to interact strongly. This leads to a wide range of collective behaviours from order-disorder phase transitions, condensation and superfluidity to topological phases. However, normally their intrinsically dissipative nature results in highly non-equilibrium conditions leading to new phenomena which have only started being explored. At the same time state-of-the-art semiconductor microcavities recently allowed us to achieve a fully thermalised polariton condensate analogous to cold atoms or liquid Helium. |
Monday, March 4, 2019 10:24AM - 11:00AM |
A44.00005: Room Temperature Long-Range Coherent Exciton Polariton Condensate Propagation in Lead Halide Perovskites Microwire Cavity Invited Speaker: Qihua Xiong Recent progress has shown that halide perovskites are promising optical gain materials towards room-temperature strong-light matter coupling leading to robust exciton polariton, due to large exciton binding energy and strong oscilator strength. Polariton condensates, exhibiting high speed coherent propagation and spin-based behaviour, attract considerable interest for implementing the basic elements of integrated optoelectronic devices: switching, transport, and logic. However, the implementation of such coherent polariton condensate flow is typically limited to cryogenic temperatures, constrained by small exciton binding energy in most semiconductor microcavities. Here, we demonstrate the capability of long-range non-resonantly excited polariton condensate flow at room temperature in a one-dimensional all-inorganic cesium lead bromide (CsPbBr3) perovskite microwire microcavity. The polariton condensate exhibits high speed propagation over macroscopic distances of 60 µm, while still preserving the long-range off-diagonal order. Our findings pave the way for utilizing coherent polariton condensate flow for all-optical integrated logic circuits and polaritonic devices operating at room temperature. |
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