Articles in 2023

The colour of light entails rich information even at the single-photon level. However, frequency-resolving single-photon detectors that simultaneously feature high detection efficiency and low timing jitter remain elusive. In this paper, the authors propose a nanoscale architecture for single-photon detectors to bridge the gap, opening a promising avenue toward a plethora of sensing and imaging applications.

Spin torque nano-oscillators (STNOs) have been proposed as the building blocks of Ising machines for solving combinatorial optimization problems. In this study, the authors experimentally demonstrate how the short-range magnetic coupling between a pair of STNOs controls their ability to lock with an external second harmonic signal.

Charge transfer in perovskite oxide heterostructures could break the delicate balance among charge, spin, orbital and lattice order at the interface, producing exotic phenomena that cannot be observed in bulk materials. Here, the authors observe an opposite charge transfer direction in two 3d/5d perovskite oxide heterostructures SrIrO₃/LaNiO₃ and SrIrO₃/NdNiO₃, investigate the triggered interfacial orbital and lattice reconstructions, and discuss their manipulation on transport and magnetic characteristics.

Optomechanics deals with the control and applications of mechanical effects of light on matter. Here, these effects on single-material and multimaterial larger particles with size ranging from 20 nm to a 1 μm are investigated in proximity of epsilon-near-zero metamaterials exploiting different theoretical methods.

Using mathematical structures to characterize quantum circuits and states may lead to systematic development of quantum algorithms. Here, the authors propose a “unitary dependence theory” to characterize the behaviours of quantum circuits and states in terms of how quantum gates manipulate qubits and determine their measurement probabilities.

Molecular hydrogen has a simple structure that makes it a unique benchmark for molecular quantum physics. The authors determined the transition energy of its fundamental Q(1) vibrational line with an unprecedented parts-per-billion accuracy by a novel spectrometer that combines Stimulated-Raman-Scattering with comb calibration of optical frequencies.

The dynamics of charge separation, where the underlying mechanisms are a complex interplay of many contributing factors, govern the properties and performance of solar cells. Here, the authors investigate the role of vibrational motion in the charge dynamics of donor-acceptor networks using a non-perturbative simulation tool.

Back-action limited measurements of many-body quantum systems are a challenging topic of relevance to open quantum systems and quantum metrology. This work makes important contributions in that direction by experimentally measuring and theoretically modeling via a quantum-trajectories approach coherence in an atomic Bose-Einstein condensate coupled to a far-off-resonant laser beam.

Quintet formation is a part of a photochemical energy conversion process, which could be exploited to help achieve higher efficiency values for photovoltaics. Here, the authors propose a stochastic and coherent resonance mechanism for formation of the quintet spin state in singlet fission materials, that is still viable in the strong-exchange regime.

Spontaneous pattern formation in physical system is governed by the competition between intrinsic and extrinsic length scales, causing the emergence of complex spatiotemporal profiles. The authors demonstrate that spatial nonuniformity sets Faraday-wave patterns in motion, and clearly identify the zigzag and drift dynamics in their wave crests.

In the modified Haldane model, antichiral edge states appear at the boundary of zigzag honeycomb nanoribbons. These flow oppositely at the boundary and the center of the ribbon. In this work, the authors show how to decorate the system boundary to control the edge modes’ current and spin polarization. They show how to form a three-terminal system where an unpolarized current splits into two fully spin-polarized ones.

The Clausius inequality is a way of analysing the entropy of a given process and its routes can be found in the second law of thermodynamics. Here, the authors study the non-equilibrium thermodynamics of an ultracold atomic gas in order to confirm the validity of two generalized Clausius inequalities and provide insight into the processes of thermodynamic inequalities and nonequilibrium processes.

Optical rogue waves emerge as the optical analogue to oceanic rogue waves, namely as a temporally rare fluctuations characterized by exceptionally high intensities. The authors observe the emergence and the real-time dynamics of such intensity bursts undergoing nonlinear spatial transformation in spatiotemporally mode-locked fiber lasers.

Active systems made of self-propelled units are widespread in nature, and Active Brownian particles (ABPs) are one of the simplest such system The authors theoretically and numerically investigate the collective assembly of ABPs finding a new re-entrant phase that enables motility-induced phase separation, which is dependent solely on activity.

Understanding the interaction of active matter with the random environment is relevant to the navigation of living entities within disordered media. This study introduces a minimal model of active particles that are repelled by both each other and the randomly distributed obstacles to reveal new chiral modes of collective patterns as a function of the quenched noise due to the stochastic nature of the environment.

Third-harmonic generation frequency combs grant telecom pump laser sources the direct and simultaneous access to both the near infrared and the visible spectral regions. The authors model the broadband and temporally dispersive dual-comb generation, and identify conditions for accessing a regime supporting two distinct and coexisting cavity solitons.

Current Rydberg quantum processors suffer from limitations in fidelity and scalability. Here, the authors address these limitations by proposing highly controllable multi-qubit operations that utilize the Fermi scattering of Rydberg electrons trapped in an optical lattice.

Precise modelling of solar cells devices under various conditions is essential to guide improvements in optimisation and performance of future technologies. Here, the authors present a holistic numerical model, verified with real-world data of thin-film CIGS modules, that can conduct loss analysis and predict the energy yield of thin film solar cells.

Electron-phonon coupling plays a fundamental role in the properties of conventional superconductors and is typically understood using BCS theory. Here, the authors study electron-phonon dynamics in the weak-coupling regime of Eliashberg theory identifying the similarities and differences between the two models in the dirty limit.

Fast and high-resolution Fourier transform spectrometers are indispensable for cutting-edge infrared spectroscopy. In this study, the authors employed a newly-designed fast-rotating retroreflective, broadband delay line demonstrating fast dual-comb spectroscopy with a single mid-infrared optical comb from a quantum cascade laser emitting at 8 micrometers.