Article
Mathematics, Applied
Simon Pigeon, Amandine Aftalion
Summary: We studied the condition under which turbulence can be generated when a resonantly driven exciton-polariton superfluid flows against an obstacle. The critical velocity is estimated by the transition of an operator from elliptic to hyperbolic, based on ideas developed by Frisch et al. (1992) for a superfluid flow around an obstacle. Analytical estimates based on pump amplitude and energy detuning are found to be consistent with numerical computations.
PHYSICA D-NONLINEAR PHENOMENA
(2021)
Article
Chemistry, Multidisciplinary
Yago del Valle-Inclan Redondo, Christian Schneider, Sebastian Klembt, Sven Hoefling, Seigo Tarucha, Michael D. Fraser
Summary: We have created a rotating polariton condensate at gigahertz frequencies by off-resonantly pumping with a rotating optical stirrer composed of structured laser modes. The results show that the rotating polariton condensate acquires angular momentum exceeding the critical 1n/particle and demonstrates deterministic nucleation and capture of quantized vortices with a handedness controlled by the pump rotation direction. This study enables new opportunities for exploring open dissipative superfluidity, ordering of non-Hermitian quantized vortex matter, and topological states in a highly nonlinear, photonic platform.
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
Physics, Multidisciplinary
D. G. Suarez-Forero, F. Riminucci, V Ardizzone, N. Karpowicz, E. Maggiolini, G. Macorini, G. Lerario, F. Todisco, M. De Giorgi, L. Dominici, D. Ballarini, G. Gigli, A. S. Lanotte, K. West, K. Baldwin, L. Pfeiffer, D. Sanvitto
Summary: Exciton-polaritons are hybrid light-matter excitations resulting from coupling of a photonic mode and an excitonic resonance. They exhibit optical third-order nonlinearities and can be greatly enhanced by inducing aligned electric dipoles in their excitonic part. This research demonstrates that dipolar interactions can be used to enhance parametric effects in waveguide polaritons, providing a reliable experimental measurement of direct dipolar enhancement of polariton-polariton interactions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Tristan H. Harder, Meng Sun, Oleg A. Egorov, Ihor Vakulchyk, Johannes Beierlein, Philipp Gagel, Monika Emmerling, Christian Schneider, Ulf Peschel, Ivan G. Savenko, Sebastian Klembt, Sven Hofling
Summary: The study focuses on topological defect modes in a one-dimensional Su-Schrieffer-Heeger lattice, observing highly coherent polariton lasing and confirming excitonic contribution through the application of an external magnetic field. Experimental findings of robust lasing and high temporal coherence are accurately reproduced by a combination of models, providing deeper insight into topological effects on microlasers.
Article
Multidisciplinary Sciences
Kai Peng, Renjie Tao, Louis Haeberle, Quanwei Li, Dafei Jin, Graham R. Fleming, Stephane Kena-Cohen, Xiang Zhang, Wei Bao
Summary: In this study, a series of quantum fluid phase transitions from classical fluids to superfluids and supersonic fluids were observed in halide perovskite single crystals at room temperature. This provides a foundation for exploring non-equilibrium quantum fluid many-body physics at room temperature.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
V Ardizzone, F. Riminucci, S. Zanotti, A. Gianfrate, M. Efthymiou-Tsironi, D. G. Suarez-Forero, F. Todisco, M. De Giorgi, D. Trypogeorgos, G. Gigli, K. Baldwin, L. Pfeiffer, D. Ballarini, H. S. Nguyen, D. Gerace, D. Sanvitto
Summary: This study discovered bound states in the continuum (BICs) in a planar photonic crystal lattice, which have a long lifetime and are not affected by radiation. The researchers also demonstrated non-equilibrium Bose-Einstein condensation occurring in the BIC. By combining bosonic condensation and symmetry-protected radiation eigenmodes, they showed a way to impart topological properties onto macroscopic quantum states.
Article
Materials Science, Multidisciplinary
M. Em. Spotnitz, N. H. Kwong, R. Binder
Summary: This article investigates the polariton Bardeen-Cooper-Schrieffer (BCS) state in a semiconductor microcavity, which is an example of symmetry-broken states in open systems. Fluctuations of the order parameter are an important tool for characterizing this state. By forming a condensate with composite particles, the set of zero-momentum fluctuations spans an infinite-dimensional electron-hole mode subspace. The study shows that collective fluctuation modes with orbital angular momentum different from that of the order parameter can be obtained with terahertz radiation, and that these modes, which are not Higgs modes, can result in terahertz gain.
Article
Chemistry, Multidisciplinary
Marco Dusel, Simon Betzold, Tristan H. Harder, Monika Emmerling, Johannes Beierlein, Juergen Ohmer, Utz Fischer, Ronny Thomale, Christian Schneider, Sven Hofling, Sebastian Klembt
Summary: This study demonstrates exciton-polariton lasing for topological defects at room temperature, using red fluorescent protein and a patterned mirror cavity. The results pave the way for exploring interacting boson many-body physics under ambient conditions.
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
Materials Science, Multidisciplinary
Sangeet S. Kumar, Brendan C. Mulkerin, Meera M. Parish, Jesper Levinsen
Summary: This study investigates the interactions between electrons and exciton-polaritons in a two-dimensional semiconductor microcavity, and finds that the interaction strength can be resonantly enhanced by coupling to a trion. A microscopic theory is developed to sum up all possible diagrams in the polariton-electron scattering process, and an analytic approximation of the interaction strength is derived based on universal low-energy scattering theory. The findings suggest that the trion resonance in polariton-electron scattering can appear in a wide range of microcavity systems with few semiconductor layers.
Article
Materials Science, Multidisciplinary
D. W. Snoke, V. Hartwell, J. Beaumariage, S. Mukherjee, Y. Yoon, D. M. Myers, M. Steger, Z. Sun, K. A. Nelson, L. N. Pfeiffer
Summary: In this paper, a series of experiments on polariton-polariton interactions in GaAs/AlxGa1-xAs microcavity polariton structures are reviewed and compared, and an updated analysis of these experiments is presented. The results show that the energy shift of the spectral lines as well as measurements sensitive to the polariton scattering rate are important for calibrating the interaction parameter at low excitation density. The adjusted value of the interaction parameter is lower than previous reports but still higher than theoretically predicted.
Article
Nanoscience & Nanotechnology
Jiaxin Zhao, Antonio Fieramosca, Ruiqi Bao, Wei Du, Kevin Dini, Rui Su, Jiangang Feng, Yuan Luo, Daniele Sanvitto, Timothy C. H. Liew, Qihua Xiong
Summary: Researchers have observed nonlinear optical parametric polaritons in a WS2 monolayer microcavity, which opens up new possibilities for the development of all-optical valley polariton nonlinear devices.
NATURE NANOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Jiaxin Zhao, Antonio Fieramosca, Kevin Dini, Ruiqi Bao, Wei Du, Rui Su, Yuan Luo, Weijie Zhao, Daniele Sanvitto, Timothy C. H. Liew, Qihua Xiong
Summary: Monolayer transition-metal dichalcogenide (TMD) materials have unique properties and promising applications in optoelectronic devices. By vertically stacking TMD materials, researchers can control the electronic and optical properties. The integration of TMD heterostructures in planar microcavities is important for controlling light-matter interactions and forming robust polaritons. The authors demonstrate the systematic control of coupling strength by embedding multiple WS2 monolayers in a planar microcavity and observe the presence of long-living dark excitations.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Guangyao Li, Meera M. Parish, Jesper Levinsen
Summary: Recent experiments in exciton-polariton systems have provided precise measurements of the polariton-polariton interaction constant, crucial for controlling the nonlinear dynamics of polariton condensates. By utilizing a new microscopic description involving electrons, holes, and photons, researchers performed accurate calculations of the interaction constants, showing varying results under different light-matter coupling strengths.
Article
Multidisciplinary Sciences
James Q. Quach, Kirsty E. McGhee, Lucia Ganzer, Dominic M. Rouse, Brendon W. Lovett, Erik M. Gauger, Jonathan Keeling, Giulio Cerullo, David G. Lidzey, Tersilla Virgili
Summary: The rate at which matter emits or absorbs light can be changed by the environment. This study focuses on the phenomenon of superabsorption, which is harder to demonstrate due to the challenges of probing ultrafast processes. A paradigmatic model of a quantum battery, made of a microcavity enclosing a molecular dye, is implemented to observe charging dynamics and demonstrate superextensive charging rates and storage capacity. Decoherence is found to play a crucial role in stabilizing energy storage.
Article
Physics, Multidisciplinary
Kirill P. Kalinin, Natalia G. Berloff
Summary: The advantage of unconventional computing architectures is demonstrated by solving different instances of problems, and a criterion for optimization simplicity is proposed to classify the complexity of these instances. Different neuromorphic architectures can optimize instances according to this criterion, and the Ising model on the Mobius ladder graph is shown to be easy for Ising machines. By studying various graphs, it is found that the computational complexity lies between P and NP-hard classes and there are a significant number of polynomially simple instances.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Moritz Cygorek, Michael Cosacchi, Alexei Vagov, Vollrath Martin Axt, Brendon W. Lovett, Jonathan Keeling, Erik M. Gauger
Summary: Analyzing open quantum systems is difficult due to the complexity of their environments, but an automated method for identifying efficient representations can aid in numerical simulations. While some environments can be accurately described, approximations may be necessary in cases of large Hilbert spaces. Accurate numerical methods exist, but are primarily limited to environments with Gaussian correlations.
Article
Physics, Multidisciplinary
Samuel N. Alperin, Natalia G. Berloff
Summary: This paper investigates a generic mechanism of breather formation by simultaneously driving a polariton condensate with both nonresonant and nth order resonant pump frequencies. It constructs a family of exotic breathers with nontrivial discrete order of rotational symmetry for the second order resonance. Furthermore, it demonstrates the spontaneous emergence of crystalline and glassy orderings of lattices of polygonal breathers, depending on the degree of polygonal excitations at the lattice sites.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Piper Fowler-Wright, Brendon W. Lovett, Jonathan Keeling
Summary: This article demonstrates a method to simulate a model of many molecules with strong coupling to many vibrational modes and collective coupling to a single photon mode. By combining different methods and approximations, the steady state and photoluminescence spectrum of the model under incoherent pumping are analyzed. This approach allows for the simulation of many-body systems with strong coupling to multiple environments and extraction of both static and dynamical properties.
PHYSICAL REVIEW LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Marvin Syed, Natalia G. Berloff
Summary: Many physical systems with dynamical evolution have been proposed and realized as promising alternatives to conventional computing, as they can solve optimization problems at their steady state. Systems of oscillators such as coherent Ising and XY machines based on lasers, optical parametric oscillators, memristors, polariton and photon condensates are particularly promising due to their scalability, low power consumption, and room temperature operation. Our work shows that the canonical Andronov-Hopf networks can capture the bifurcation behavior of physical optimizers, and by transforming any physical optimizer into the canonical network, the success of the physical XY-Ising machine depends on the control of network parameters. This allows for the hybridization of ideas across different physical platforms.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Physics, Multidisciplinary
L. Q. English, A. V. Zampetaki, K. P. Kalinin, N. G. Berloff, P. G. Kevrekidis
Summary: This paper explores the application of networks of nonlinear electronic oscillators in solving combinatorial optimization problems. Experimental results show that by driving the oscillator networks into subharmonic response, energy minimization can be achieved on specific graphs. Theoretical modeling accurately predicts experimental results and extends them to larger graphs.
COMMUNICATIONS PHYSICS
(2022)
Editorial Material
Chemistry, Physical
Jonathan Keeling, Graham Turnbull
Summary: Time-dependent pump-probe studies of polaritonic transport at the interface of a distributed Bragg reflector between organic molecules and Bloch surface waves formed by strong coupling reveal a transition from diffusive to ballistic behavior.
Article
Quantum Science & Technology
Ronen M. Kroeze, Brendan P. Marsh, Kuan-Yu Lin, Jonathan Keeling, Benjamin L. Lev
Summary: In this work, a confocal-cavity-QED microscope is used to achieve cooperativity exceeding 110, which is comparable to the best single-mode cavities. This is made possible by the dispersive coupling to the atoms of many near-degenerate modes in the cavity, providing important insights for studying quantum many-body physics in the driven-dissipative setting.
Review
Quantum Science & Technology
Nikita Stroev, Natalia G. Berloff
Summary: This review provides an overview of photonics computing, which utilizes photons, photons coupled with matter, and optics-related technologies for efficient computational purposes. It covers the history and development of photonics computing, focusing on optimization tasks and neural network implementations. The authors examine special-purpose optimizers, mathematical descriptions of photonics optimizers, and discuss various applications such as logistics, finance, machine learning, and image processing. The paper also explores the technological advancements and challenges in photonics computing, as well as the prospects and potential applications of optical quantum computing.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Gerald E. Fux, Dainius Kilda, Brendon W. Lovett, Jonathan Keeling
Summary: We propose a general numerical method for computing the dynamics and multitime correlations of chains of quantum systems coupled to structured environments. The method combines the process tensor formalism for general open quantum systems with time-evolving block decimation for one-dimensional chains, reducing numerical complexity and enabling a wide range of applications. We demonstrate its effectiveness by studying thermalization of individual spins in a short XYZ Heisenberg chain and diffusion dynamics in a longer XY chain where each site couples to its own bath.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Antti J. Moilanen, Kristin B. Arnardottir, Jonathan Keeling, Paivi Torma
Summary: In this study, the dynamics of multimode polariton lasing in organic microcavities is investigated using a second-order cumulant equation approach. By analyzing the time evolution of photon mode occupations, it is shown that the presence of multiple lasing peaks in time-integrated mode occupations can be attributed to either bimodal lasing or temporal switching between several modes. The origin of the temporal switching is found to be different in the weak and strong coupling regimes.
Article
Materials Science, Multidisciplinary
M. Ahsan Zeb, Peter G. Kirton, Jonathan Keeling
Summary: We study how polariton condensation affects charge transport in organic materials. We find that the hopping process in these materials can create excitations starting from a state with finite excitation density. However, thermal factors suppress these excitations in typical room temperature materials, and ground-state processes dominate. We also discover that the hopping rate is exponentially sensitive to condensate density, matter-light coupling, and cavity photon detuning.
Article
Optics
Yiu-Fung Chiu, Aidan Strathearn, Jonathan Keeling
Summary: This study introduces a numerical method for determining the Hamiltonian of mean force (HMF) Gibbs state for a quantum system strongly coupled to a reservoir. By comparing real-time and imaginary-time propagation, the study confirms the accuracy of the HMF Gibbs state in predicting steady states. The method showcases the potential of the imaginary-time TEMPO approach in exploring reservoir-induced entanglement between qubits.
Article
Materials Science, Multidisciplinary
A. Tiene, J. Levinsen, J. Keeling, M. M. Parish, F. M. Marchetti
Summary: This article studies the optical absorption spectrum of doped two-dimensional semiconductors in the spin-valley polarized limit. It demonstrates that the three-body trion state must have p-wave symmetry and evaluates the optical properties of the system. It also explores the impact of different doping conditions on the system's optical properties.
