Signatures of optical phase transitions in superradiant and subradiant atomic arrays

Parmee, Christopher and Ruostekoski, Janne (2020) Signatures of optical phase transitions in superradiant and subradiant atomic arrays. Communications Physics, 3. ISSN 2399-3650

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Abstract

Resonant light interacting with matter supports different phases of a polarisable medium, and optical bistability where two phases coexist. Such phases have previously been actively studied in cavities. Here, we identify signatures of optical phase transitions and optical bistability mapped onto scattered light in free-space planar arrays of cold atoms. Methods on how to explore such systems in superradiant and extreme subradiant states are proposed. The cooperativity threshold and intensity regimes for the intrinsic optical bistability, supported by resonant dipole-dipole interactions alone, are derived in several cases of interest analytically. Subradiant states require lower intensities, but stronger cooperativity for the existence of non-trivial phases than superradiant states. The transmitted light reveals phase transitions and bistability that are predicted by mean-field theory as large jumps in coherent and incoherent signals and hysteresis. In the quantum solution, traces of phase transitions are identified in enhanced quantum fluctuations of excited level populations.

Item Type:
Journal Article
Journal or Publication Title:
Communications Physics
ID Code:
148008
Deposited By:
Deposited On:
06 Oct 2020 15:55
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Jan 2021 20:55