Experimental evidence of replica symmetry breaking in random lasers

N. Ghofraniha (), I. Viola, F. Di Maria, G. Barbarella, G. Gigli, L. Leuzzi and C. Conti
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N. Ghofraniha: Institute for Chemical Physical Processes, CNR (CNR-IPCF), UOS Roma Kerberos, Dept. of Physics, La Sapienza University
I. Viola: La Sapienza University, Piazzale Aldo Moro 5
F. Di Maria: Institute of Organic Synthesis and Photoreactivity, CNR (CNR-ISOF)
G. Barbarella: Institute of Organic Synthesis and Photoreactivity, CNR (CNR-ISOF)
G. Gigli: National Nanotechnology Laboratory of CNR-Nanoscience Institute (NNL, CNR-NANO)
L. Leuzzi: Institute for Chemical Physical Processes, CNR (CNR-IPCF), UOS Roma Kerberos, Dept. of Physics, La Sapienza University
C. Conti: La Sapienza University, Piazzale Aldo Moro 5

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Spin-glass theory is one of the leading paradigms of complex physics and describes condensed matter, neural networks and biological systems, ultracold atoms, random photonics and many other research fields. According to this theory, identical systems under identical conditions may reach different states. This effect is known as replica symmetry breaking and is revealed by the shape of the probability distribution function of an order parameter named the Parisi overlap. However, a direct experimental evidence in any field of research is still missing. Here we investigate pulse-to-pulse fluctuations in random lasers, we introduce and measure the analogue of the Parisi overlap in independent experimental realizations of the same disordered sample, and we find that the distribution function yields evidence of a transition to a glassy light phase compatible with a replica symmetry breaking.

Date: 2015
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DOI: 10.1038/ncomms7058

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