Direct observation of the quantum-fluctuation driven amplitude mode in a microcavity polariton condensate
| Autor: | Brian Fluegel, Jonathan Beaumariage, Ryo Hanai, Peter B. Littlewood, Angelo Mascarenhas, Mark Steger, David W. Snoke, Alexander Edelman, Loren Pfeiffer, Kenneth D. West |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Superconductivity Condensed Matter::Quantum Gases Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter::Other Mode (statistics) Charge density FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Superfluidity Amplitude Quantum Gases (cond-mat.quant-gas) Quantum electrodynamics 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Polariton 010306 general physics 0210 nano-technology Quantum Physics (quant-ph) Condensed Matter - Quantum Gases Quantum Quantum fluctuation |
| Popis: | The Higgs amplitude mode is a collective excitation studied and observed in a broad class of matter, including superconductors, charge density waves, antiferromagnets, 3He p-wave superfluid, and ultracold atomic condensates. In all the observations reported thus far, the amplitude mode was excited by perturbing the condensate out of equilibrium. Studying an exciton-polariton condensate, here we report the first observation of this mode purely driven by intrinsic quantum fluctuations without such perturbations. By using an ultrahigh quality microcavity and a Raman spectrometer to maximally reject photoluminescence from the condensate, we observe weak but distinct photoluminescence at energies below the condensate emission. We identify this as the so-called ghost branches of the amplitude mode arising from quantum depletion of the condensate into this mode. These energies, as well as the overall structure of the photoluminescence spectra, are in good agreement with our theoretical analysis. |
| Databáze: | OpenAIRE |
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