Article
Physics, Multidisciplinary
S. Baryshev, A. Zasedatelev, H. Sigurdsson, I Gnusov, J. D. Topfer, A. Askitopoulos, P. G. Lagoudakis
Summary: In this study, we conducted full polarization tomography on photon correlations in a spinor exciton-polariton condensate. Our measurements demonstrate the different forms of condensate pseudospin mean-field dynamics and their intrinsic relation to the condensate photon statistics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Jiaxin Zhao, Rui Su, Antonio Fieramosca, Weijie Zhao, Wei Du, Xue Liu, Carole Diederichs, Daniele Sanvitto, Timothy C. H. Liew, Qihua Xiong
Summary: This study reports the realization of polariton lasing in a TMD microcavity at room temperature for the first time, showing evidence of continuous wave pumped polariton lasing through macroscopic occupation of the ground state, emergence of temporal coherence, presence of an exciton fraction-controlled threshold, and buildup of linear polarization. This work represents a critical step towards utilizing nonlinear polariton-polariton interactions and providing a new platform for thresholdless lasing.
Article
Materials Science, Multidisciplinary
M. Pieczarka, O. Bleu, E. Estrecho, M. Wurdack, M. Steger, D. W. Snoke, K. West, L. N. Pfeiffer, A. G. Truscott, E. A. Ostrovskaya, J. Levinsen, M. M. Parish
Summary: The authors develop a generalized version of Bogoliubov theory for a driven-dissipative exciton-polariton condensate with a large incoherent uncondensed component. They argue that the presence of an excitonic reservoir modifies the energy and amplitudes of the Bogoliubov quasiparticle excitations. The authors support their theoretical findings with experimental results.
Article
Multidisciplinary Sciences
Quentin Fontaine, Davide Squizzato, Florent Baboux, Ivan Amelio, Aristide Lemaitre, Martina Morassi, Isabelle Sagnes, Luc Le Gratiet, Abdelmounaim Harouri, Michiel Wouters, Iacopo Carusotto, Alberto Amo, Maxime Richard, Anna Minguzzi, Leonie Canet, Sylvain Ravets, Jacqueline Bloch
Summary: This article studies the evolution and universal behavior of the phase in driven-dissipative systems, and finds that it belongs to the KPZ universality class through experimental and theoretical analysis. It reveals the fundamental physical differences between driven non-equilibrium systems and their equilibrium counterparts.
Article
Multidisciplinary Sciences
Ivan Gnusov, Stella Harrison, Sergey Alyatkin, Kirill Sitnik, Julian Toepfer, Helgi Sigurdsson, Pavlos Lagoudakis
Summary: In this study, the rotating bucket experiment was realized for the optically trapped quantum fluid of light based on the exciton-polariton Bose-Einstein condensate in a semiconductor microcavity. The appearance of quantized vortices was observed, providing a means for fundamental studies of different superfluids.
Article
Materials Science, Multidisciplinary
Zhedong Zhang, Shixuan Zhao, Dangyuan Lei
Summary: In this study, a full quantum theory beyond the mean-field regime is developed for an exciton-polariton condensate to understand quantum fluctuations. The researchers find that nonlinearity leads to fast relaxation correlated with the pump, resulting in quantum condensation above threshold. By increasing the pump intensity, a nonequilibrium phase transition towards the condensation of lower polaritons occurs, with a transition in statistics from thermal to super-Poissonian and then to a nonclassical distribution. The results highlight the role of dark states in polariton fluctuations and reveal the nonclassical counting statistics of emitted photons.
Article
Materials Science, Multidisciplinary
Denis Aristov, Helgi Sigurdsson, G. Pavlos Lagoudakis
Summary: This study investigates the modification of the spatial coupling parameter between interacting ballistic exciton-polariton condensates caused by photonic spin-orbit coupling in planar semiconductor microcavities. The authors propose a strategy to enhance the coupling strength between next-nearest neighbors, contrary to the conventional spatial coupling hierarchy. This strategy takes advantage of the dominant high-momentum components in the ballistic condensates, which lead to rapid precession of the polariton pseudospin. Consequently, the interaction strength between condensate pairs experiences distance-periodic screening, resulting in significant changes to synchronization and condensation threshold solutions.
Article
Multidisciplinary Sciences
Mengjie Wei, Wouter Verstraelen, Konstantinos Orfanakis, Arvydas Ruseckas, Timothy C. H. Liew, Ifor D. W. Samuel, Graham A. Turnbull, Hamid Ohadi
Summary: The authors demonstrate the on-the-fly reconfigurable optical trapping of organic polariton condensates, which are delocalized over a macroscopic distance from the excitation region. This study holds great potential for future research on polaritonic lattice physics.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Nguyen Thanh Phuc
Summary: Room-temperature Bose-Einstein condensates of exciton polaritons have been achieved in organic molecular systems due to strong light-matter interaction, strong exciton binding energy, and low effective mass. These condensates have shown potential in nonlinear optics and optoelectronic applications, and have demonstrated Bose enhancement in excitation-energy transfer processes.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Chuan Tian, Linqi Chen, Yingjun Zhang, Liqing Zhu, Wenping Hu, Yichun Pan, Zheng Wang, Fangxin Zhang, Long Zhang, Hongxing Dong, Weihang Zhou
Summary: We observed coherent oscillations in the relaxation dynamics of an exciton-polariton condensate driven by parametric scattering processes. The high scattering efficiency of these parametric scatterings, due to the interbranch scattering scheme and nonlinear polariton-polariton interactions, leads to the fast depletion of the polariton condensate and periodic shut-off of the bosonic stimulation processes, resulting in relaxation oscillations. By employing polariton-reservoir interactions, the oscillation dynamics in the time domain can be projected onto the energy space.
Article
Physics, Multidisciplinary
H. P. Zahn, V. P. Singh, M. N. Kosch, L. Asteria, L. Freystatzky, K. Sengstock, L. Mathey, C. Weitenberg
Summary: Driving a many-body system out of equilibrium leads to the emergence and decay of transient states, which can manifest as pattern and domain formation. In this study, we experimentally and theoretically investigate the out-of-equilibrium dynamics of a bosonic lattice model subjected to a strong dc field, and observe the emergence of pronounced density-wave patterns.
Article
Physics, Multidisciplinary
Wei Qi, Xiao-Gang Guo, Liang-Wei Dong, Xiao-Fei Zhang
Summary: We investigate the modulational instability of a resonant polariton condensate in a discrete lattice using a discrete gain-saturation model. The dispersion relation for modulational instability is derived by linear-stability analysis. The effects of pumping strength, nonlinearity, detuning strength, and coupling strength on modulational instability are studied. The interplay between these parameters is found to dramatically alter the conditions for modulational instability. We believe that the predicted results in this study can provide useful guidance for future experimental exploration of exciton-polariton condensates in lattices.
Article
Physics, Multidisciplinary
E. Estrecho, M. Pieczarka, M. Wurdack, M. Steger, K. West, L. N. Pfeiffer, D. W. Snoke, A. G. Truscott, E. A. Ostrovskaya
Summary: In this study, low-energy, low-momentum collective oscillations of an exciton-polariton condensate in a round box trap were observed, with the frequencies of dipole and breathing modes consistent with a weakly interacting two-dimensional trapped Bose gas. The extracted speed of sound from the dipole oscillation frequency was found to be smaller than the Bogoliubov sound, partially due to the influence of the incoherent reservoir. These findings provide insights into the effects of reservoir, dissipation, energy relaxation, and finite temperature on the superfluid properties of exciton-polariton condensates and other two-dimensional open-dissipative quantum fluids.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Andrew Salij, Roel Tempelaar
Summary: This study explores the interaction between chiral cavity photons and exciton polaritons in monolayer transition-metal dichalcogenides, revealing coherent mixing of valley polarization induced by polaritons and the lifting of degeneracy, allowing for wavelength-selective access to valley pseudospin.
Article
Physics, Multidisciplinary
Sebastian Pres, Bernhard Huber, Matthias Hensen, Daniel Fersch, Enno Schatz, Daniel Friedrich, Victor Lisinetskii, Ruben Pompe, Bert Hecht, Walter Pfeiffer, Tobias Brixner
Summary: In this study, the local detection of nanoscale plasmon quantum wave packets was achieved using plasmon-assisted electron emission as a signal in coherent two-dimensional nanoscopy. The existence of a plasmon quantum wave packet was demonstrated, and an improved model for plasmon-assisted electron emission processes was provided.
Article
Materials Science, Multidisciplinary
Nguyen Ha My Dang, Simone Zanotti, Emmanuel Drouard, Celine Chevalier, Gaelle Trippe-Allard, Mohamed Amara, Emmanuelle Deleporte, Vincenzo Ardizzone, Daniele Sanvitto, Lucio Claudio Andreani, Christian Seassal, Dario Gerace, Hai Son Nguyen
Summary: Exciton-polaritons are hybrid excitations resulting from the strong coupling between an active excitonic material and photonic resonances. The experimental investigation of the formation of polariton BICs, arising from the mixing between hybrid inorganic-organic perovskite excitons and an optical bound state in a continuum, confirms the transfer of the topological nature of the photonic BIC to the polariton BIC, paving the way for room temperature polaritonic devices.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Davide Nigro, Vincenzo D'Ambrosio, Daniele Sanvitto, Dario Gerace
Summary: This paper introduces an integrated quantum logic device based on two-body polaritonic interaction, highlighting the quantum correlations of polaritons in low-density regime and their potential applications in quantum information processing and metrology.
COMMUNICATIONS PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Saransh Raj Gosain, Edith Bellet-Amalric, Martien den Hertog, Regis Andre, Joel Cibert
Summary: This study investigates the early stage of semiconductor nanowire growth where the diffusion length of sidewall adatoms is short due to strong desorption. Experimental results of ZnSe nanowire growth using molecular beam epitaxy are described and interpreted using the Burton-Cabrera-Frank model for step propagation along the sidewalls. The results are compared to other II-VI and III-V nanowires, highlighting the role of growth parameters and resulting nanowire shape.
Article
Nanoscience & Nanotechnology
Amir Rahmani, David Colas, Nina Voronova, Kazem Jamshidi-Ghaleh, Lorenzo Dominici, Fabrice P. Laussy
Summary: This study theoretically analyzes the propagation of phase singularities under the strong coupling between light and matter, using resonant pulsed pumping. The generation of phase singularities is found to be related to the dispersion of polaritons and the motion of vortices, and the morphology of singularities is analyzed in the pseudospin space.
Article
Physics, Multidisciplinary
Albert F. Adiyatullin, Lavi K. Upreti, Corentin Lechevalier, Clement Evain, Francois Copie, Pierre Suret, Stephane Randoux, Pierre Delplace, Alberto Amo
Summary: By implementing a synthetic photonic lattice in a two-coupled ring system, we have successfully designed an anomalous Floquet metal that exhibits two different topological properties in its gapless bulk. Firstly, this synthetic lattice features bands characterized by a winding number, which emerges from the breakup of inversion symmetry and is directly linked to the appearance of Bloch suboscillations in its bulk. Secondly, the Floquet nature of the lattice leads to well-known anomalous insulating phases with topological edge states. The combination of broken inversion symmetry and periodic time modulation studied here enriches the range of topological phases available in lattices subject to Floquet driving, and suggests the potential emergence of novel phases when periodic modulation is combined with the breakup of spatial symmetries.
PHYSICAL REVIEW LETTERS
(2023)
News Item
Optics
Fabrice P. Laussy
Summary: The study of a light-matter fluid of exciton-polaritons verifies the presence of an inverse energy cascade in two-dimensional quantum turbulence.
Article
Optics
R. Panico, P. Comaron, M. Matuszewski, A. S. Lanotte, D. Trypogeorgos, G. Gigli, M. De Giorgi, V. Ardizzone, D. Sanvitto, D. Ballarini
Summary: Turbulent phenomena are observed in both classical and quantum fluids, with the latter requiring precise manipulation of quantum fluids. In this study, we measured the turbulent dynamics of a two-dimensional quantum fluid of exciton-polaritons, a hybrid light-matter quasiparticle. The formation of clusters of quantum vortices was triggered by the increase of the incompressible kinetic energy per vortex, demonstrating the tendency of the vortex-gas towards highly excited configurations despite the dissipative nature of the system. These findings provide a foundation for investigating quantum turbulence in two-dimensional fluids of light.
Article
Physics, Multidisciplinary
Eduardo Zubizarreta Casalengua, Elena del Valle, Fabrice P. Laussy
Summary: In this paper, we discuss the two-photon correlations from side peaks formed when a two-level system emitter is coherently driven with a detuning between the driving source and the emitter. We combine the theories of frequency-resolved photon correlations and homodyning to provide a neat picture compatible with perturbative two-photon scattering. This has implications for controlling, enhancing, and exploring new regimes of multiphoton emission. We also propose a way to demonstrate the quantum coherent nature of the process solely through photoluminescence observations.
Article
Multidisciplinary Sciences
Anna Grudinina, Maria Efthymiou-Tsironi, Vincenzo Ardizzone, Fabrizio Riminucci, Milena De Giorgi, Dimitris Trypogeorgos, Kirk Baldwin, Loren Pfeiffer, Dario Ballarini, Daniele Sanvitto, Nina Voronova
Summary: Characterizing the spectra of low-lying elementary excitations is crucial for studying bosonic quantum fluids, but the low occupancy of non-condensate states makes them difficult to observe. However, recent advancements in coupling electromagnetic resonance to semiconductor excitons have allowed the realization of low-threshold Bose-Einstein condensation in symmetry-protected bound states in the continuum. In this study, the authors investigate the peculiarities of the Bogoliubov excitation spectrum in this system, revealing interesting features such as energy-flat parts, linearization at non-zero momenta, and anisotropic sound velocity.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Gabriel Caceres-Aravena, Bastian Real, Diego Guzman-Silva, Paloma Vildoso, Ignacio Salinas, Alberto Amo, Tomoki Ozawa, Rodrigo A. Vicencio
Summary: In this work, the transfer of photonic modes between topological edge states in a one-dimensional photonic lattice is demonstrated experimentally. The transfer is shown to remain effective even in the presence of a high density of states and hopping impurities. The dynamics of the waveguide lattice are explored using a wavelength-scan method. These results provide an alternative approach to the implementation of efficient transfer protocols.
Article
Materials Science, Multidisciplinary
F. P. M. Mendez-Cordoba, F. J. Rodriguez, C. Tejedor, L. Quiroga
Summary: We study the ability to modify the connectivity of Majorana fermions through selective cavity coupling. By selectively accessing light-matter interactions with specific physical sites, we demonstrate the displacement of topological qubits (TQs) associated with nonlocal Majorana fermion pairing from the edges to the bulk of a topological chain. Our comprehensive study using density matrix renormalization group method confirms analytical insights and reveals emergent cavity photon features. Furthermore, we show that the development of high nontrivial matter correlations leaves measurable nonclassical photon imprints in the cavity, providing innovative ways to dynamically generate TQ nonlocal correlations in hybrid photonic solid-state systems.
Article
Optics
Gaetan Leveque, Yan Pennec, Pascal Szriftgiser, Alberto Amo, Alejandro Martinez
Summary: The realization of photonic crystal waveguides with high topological protection allows for robust light propagation and compact device design through sharp bends and splitters. This study evaluates the conversion between helical topological edge modes at sharp bends and splitters using valley topological triangular resonators coupled to an input waveguide. Numerical simulations show evidence of backward scattering and helicity conversion at cavity corners and splitters, which can result in transmission minima and split resonances. A phenomenological model is introduced to quantify these effects and compare with numerical simulations, demonstrating the importance of helicity conversion at corners and sharp bends. This approach enables predictive calculations for large devices and is crucial for the design of photonic devices with compactness and low losses through topological conduction of electromagnetic waves.
Article
Physics, Multidisciplinary
R. Panico, G. Macorini, L. Dominici, M. De Giorgi, G. Gigli, D. Sanvitto, D. Ballarini, A. S. Lanotte
Summary: The kinematic properties of a rotating vortex lattice imprinted on a freely expanding polariton quantum fluid were studied. By directly measuring the phase and modulus of the complex-valued macroscopic wavefunction, and extracting velocity and angular momentum profiles across the condensate, it was found that corrections to the vortex trajectories may be induced by the non-uniform and unsteady background density profile, resulting in fractional orbital angular momentum per particle.
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS
(2022)
Article
Optics
Juan Camilo Lopez Carreno, Eduardo Zubizarreta Casalengua, Blanca Silva, Elena del Valle, Fabrice P. Laussy
Summary: This article describes some of the main external mechanisms that lead to a loss of antibunching in quantum light, including contamination by noise, time jitter in photon detection, and the effect of frequency filtering. The formalism for describing time jitter is derived and connected to the existing formalism for frequency filtering. The emission from a two-level system under both incoherent and coherent driving is studied, with analytical solutions revealing unexpected structures in the transitions from perfect antibunching to thermal or uncorrelated emission.
