Emergence of superradiance in dissipative dipolar-coupled spin systems

• URL: http://arxiv.org/abs/2406.09100v1
• Date: Thu, 13 Jun 2024 13:29:07 GMT
• Title: Emergence of superradiance in dissipative dipolar-coupled spin systems
• Authors: Saptarshi Saha, Yeshma Ibrahim, Rangeet Bhattacharyya,
• Abstract summary: This work shows that dissipative dipolar-coupled systems exhibit an identical collective dissipation aided by the nonsecular part of the dipolar coupling. Our results agree well with the standard results of pure spin superradiance observed experimentally in various systems.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In the superradiance phenomenon, a collection of non-interacting atoms exhibits collective dissipation due to interaction with a common radiation field, resulting in a non-monotonic decay profile. This work shows that dissipative dipolar-coupled systems exhibit an identical collective dissipation aided by the nonsecular part of the dipolar coupling. We consider a simplified dipolar network where the dipolar interaction between the spin-pairs is assumed to be identical. Hence the dynamics remain confined in the block diagonal Hilbert spaces. For a suitable choice of the initial condition, the resulting dynamics require dealing with a smaller subspace which helps extend the analysis to a larger spin network. To include the nonsecular dipolar relaxation, we use a fluctuation-regulated quantum master equation. We note that a successful observation of superradiance in this system requires a weak system-bath coupling. Moreover, we find that for an ensemble of N spins, the maximum intensity of the radiation exhibits a nearly quadratic scaling (N^2), and the dipolar relaxation time follows an inverse square proportionality (1/N^2); these two observations help characterize the emergence of superradiance. Our results agree well with the standard results of pure spin superradiance observed experimentally in various systems.

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