Working Group 4

The working group 4 (WG4) of this COST Action is focused on the investigation of cooperative effects, correlations, and many-body physics tailored by strongly confined fields in nanophotonic and plasmonic systems. Topics include:

Photonic Quantum Simulation: engineering strongly coupled photonic many-body systems,
analytic and numerical techniques for treating driven-dissipative many-body systems, plasmonic and nanophotonic lattices, …

Atom-Light Interactions in 1D: superradiance and self-ordering in 1D, efficient coupling of atoms, molecules, defect centers and quantum dots to plasmonic and photonic waveguides, physics of epsilon-near-zero (ENZ) and chiral waveguides, …

Collective Effects & Phase Transitions: Dicke and self-organization phase transitions, cavity QED with atomic or spin ensembles, strong and ultra-strong coupling effects in cavity QED, …

Quantum Plasmonics: strong plasmonic nonlinearities, plasmonic lattices and graphene plasmonics, efficient molecule-plasmon coupling and energy transfer, quantum statistics of plasmonic excitations, …

Nano-Optomechanics: strong coupling optomechanics in nano-OM systems, OM generation of nonclassical states and entanglement for photons and phonons, graphene-based OM systems, …

The goal of WG4 is to connect theorists and experimental researchers working at the interface between quantum optics and many-body physics and to stimulate interdisciplinary collaborations through meetings, training schools and short term scientific missions (STSM).

WG4 Matrix
ObjectivePhotonic Quantum Simulation
 – schemes for engineering strongly coupled photonic many-body systems,effective gauge fields, non-trivial topologies
– new numerical methods for driven-dissipative many-body systems: MPS (1D), corner-space renormalization (2D)
– ultrastrong coupling theory for atom-waveguide systems
– theory of plasmonic condensates
– plasmonic lattice systems
– optimized / flexible numerical methods for open quantum many-body systems
– optical/plasmonic lattice systems with non-linearities exceeding losses
ObjectiveAtom-Light Interactions in 1D
– theory of self-ordering in driven 1 D atom-waveguide systems
– new proposal for superradiance/correlated decay between SiV centres in diamond waveguides
– realistic predictions for photon transport in slow-light waveguides
– strong light-matter interactions in slow-light waveguides

-QD-pillar systems and free-space lensing for efficient emitter-photon coupling
– design of chiral photonic crystal waveguides with unidirectional coupling
– epsilon-near-zero (ENZ) medium for unconventional (position independent) dipole-dipole interactions
– bright single molecule emitters and SiV
– long-distance coupling of two separated quantum dots in 2D photonic crystal structures
Goals– combining chiral or ENZ waveguides with QDs or other emitters
– coupling of molecules to hybrid (plasmonic/dielectric)waveguides
ObjectiveCollective Effects & Phase Transitions
– Dicke phase transition and self-organization in cavatiy QED, relaxation dynamics and prethermalization
– QPT and universal dynamics in the single atom Rabi model
– cavity protection effects and decoherence control of atomic/spin ensemble quantum memories
– Green’s tensor approach to model superradiance of many random emitters coupled to plasmonic resonances
– hydrodynamical models for quantum plasmas in semiconductors
Goals– super-radiation and control of coherence with ENZ mediums
ObjectiveQuantum Plasmonics
– non-linear effects in organic “plasmonics”
– exciton compensation of Coulomb blocking the current through conduction nanjunctions
– modeling of plasmons in nano-graphene sheets
– pseudoparticle nonequilibrium Green function formalism for exact treating the coupling between plasmons and excitons
– plasmon induced non-linearities in nanostructured graphene
– plasmonic lattices
– demonstration of particle-wave duality for plasmons
– strong coupling between SPP and molecules – plasmon chemistry
– plasmon assisted energy transfer
Goals– increase life plasmon lifetime
– enhanced plasmonic non-linearites using near-field effects
– conditioned preparation of non-classical mechanical states and entanglement for weakly coupled OM systems
– modeling of mechanical properties of carbon nanotubes
– Near-field dissipative coupling of graphene resonators to single emitters
Goals– demonstrate coherent near-field optomechanical coupling with graphene