Speaker: Luca Giuseppe Celardo (UNIFI)
Title: Cooperative effects in biological and condensed matter quantum systems
Abstract: Cooperative effects are at the center of interest in many systems in physics such as cold atomic clouds, light harvesting systems, and trapped ions. Cooperative effects such as Superradiance and Supertransfer induce enhanced energy transport efficiency and robustness to noise. In the first part of the talk we will review the role of Superradiance in biological light-harvesting systems. Design of a bio-inspired Sun-light pumped laser will be discussed.
At the heart of Superradiance lies the long range of the interactions mediated by the photon field between the molecules.
The second part of the talk will be devoted to discuss the interplay of cooperativity and noise in systems with long range interaction which can be implemented in several contexts, such as cavity physics and ion trapped experiments. The main focus will be on the Cooperative Shielding effect. Contrary to the common expectation that long-range interaction should necessarily induce an instantaneous spread of information in the thermodynamic limit, we show that, as the system size increases, the dynamics can actually become more confined into invariant subspaces. In such subspaces, the dynamics is effectively shielded from long-range interaction, that is, it occurs as if that interaction was absent. Consequences of the interplay of cooperativity and disorder on localization and the emergence of a mobility edge in the imaginary axis will be discussed.
References
[1] Bio-inspired natural sunlight-pumped lasersF Mattiotti, WM Brown, N Piovella, S Olivares, EM Gauger, GL Celardo, New Journal of Physics 23 (10), 103015 (2021).
[2] Disorder-enhanced and disorder-independent transport with long-range hopping: Application to molecular chains in optical cavities, NC Chávez, F Mattiotti, JA Méndez-Bermúdez, F (2021). Borgonovi, GL Celardo, Physical Review Letters 126 (15), 153201
[3] Shielding and localization in the presence of long-range hopping. , G. L. Celardo, R. Kaiser and F. Borgonovi, Phys. Rev. B 94, 144206 (2016).
[4] Cooperative Shielding in Many-Body Systems with Long-Range Interaction , L. Santos, F. Borgonovi and G.L.Celardo, Phys. Rev. Lett. 116, 250402 (2016).