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Title
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Polaritonic Feshbach resonance
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Author
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Abstract
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| A Feshbach resonance occurs when the energy of two interacting free particles comes into resonance with a molecular bound state. When approaching this resonance, marked changes in the interaction strength between the particles can arise. Feshbach resonances provide a powerful tool for controlling the interactions in ultracold atomic gases, which can be switched from repulsive to attractive(1-4), and have allowed a range of many-body quantum physics effects to be explored(5,6). Here we demonstrate a Feshbach resonance based on the polariton spinor interactions in a semiconductor microcavity. By tuning the energy of two polaritons with anti-parallel spins across the biexciton bound state energy, we show an enhancement of attractive interactions and a prompt change to repulsive interactions. A mean-field two-channel model quantitatively reproduces the experimental results. This observation paves the way for a new tool for tuning polariton interactions and to move forward into quantum correlated polariton physics. |
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Language
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English
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Source (journal)
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Nature physics
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Publication
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2014
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ISSN
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1745-2473
1745-2481
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DOI
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10.1038/NPHYS2999
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Volume/pages
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10
:7
(2014)
, p. 500-504
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ISI
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000338843100016
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Full text (Publisher's DOI)
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