The cocatalysts or dual of photocatalysts are indispensable for high efficiency in artificial photosynthesis solar fuel production. However, the reaction activity increased by cannot be directly ascribed to accelerated catalytic kinetics, since photogenerated charges involved elementary steps photocatalytic reactions. To date, diverging views about show that their exact role photocatalysis is not well understood yet. Herein, we image local separation charge carriers across single crystals...

Abstract Ferroelectric materials with spontaneous polarization‐induced internal electric fields have drawn increasing attention in solar fuel production due to the intrinsic polarized structure. However, origination of charge separation these at nano/microlevel is ambiguous owing complexity multielectric fields. Besides, observed ability far from theoretical expectation. Herein, by spatially resolved surface photovoltage spectroscopy, it clearly demonstrated that depolarization field...

Abstract Controlling the interaction of polarization light with an asymmetric nanostructure such as a metal/semiconductor heterostructure provides opportunities for tuning surface plasmon excitation and near‐field spatial distribution. However, effects on interfacial charge transport photocatalysis plasmonic photocatalysts are unclear. Herein, we reveal dependence separation distribution in Au/TiO 2 nanoparticles under 45° incident illumination at single‐particle level using combination...

We study a single-photon band structure in one-dimensional coupled-resonator optical waveguide that chirally couples to an array of two-level quantum emitters (QEs). The chiral interaction between the resonator mode and QE can break time-reversal symmetry without magneto-optical effect external or synthetic magnetic field. As result, nonreciprocal edge states, gaps, flat bands appear. By using such system, including finite number unit cells working gap, we achieve frequency-multiplexed...

Nanoparticle photocatalysts present the obvious characteristic of heterogeneity in structure, energy, and function at spatial temporal scales. Understanding nature variations reaction dynamics photosynthetic solar energy conversion systems single particle level is crucial importance to clarify underlying mechanism photocatalytic reactions. In this review, we focus on advanced characterization tools employed reveal physical chemical properties space time. We highlight recent significant...

Exploring the properties and applications of topological quantum states is essential to better understand matter. Here, we theoretically study a quasi-one-dimensional atom array. In low-energy regime, array equivalent superatom. Driving superatom in cavity, interaction between light states. We find that edge exhibit topology-protected coherence, which can be characterized from photon transmission. This coherence helps us superradiance-subradiance transition, also its finite-size scaling...

Topological matter and topological optics have been studied in many systems, with promising applications materials science photonics technology. These advances motivate the study of interaction between light, as well protection light-matter interactions. In this work, we a waveguide-interfaced atom array. The is nontrivially modified by topology, yielding optical phenomena. We find topology-enhanced photon absorption from waveguide for large Purcell factor, i.e.,...

We introduce a simple method to realize and detect photonic topological Chern insulators with one-dimensional circiut quantum electrodynamics arrays. By periodically modulating the couplings of array, we show that this model can be mapped into two-dimensional insulator model. In addition allowing study insulators, approach also provides natural platform realise experimentally Laughlin's pumping argument. Based on scattering theory input-output formalism, edge state probed directly invariant...

A key issue for redox reactions in plasmon-induced photocatalysis, particularly water oxidation, is the concentration of surface-accumulating charges (electrons or holes) at a reaction site artificial photosynthesis. However, where plasmonic charge accumulated catalyst's surface, and how to improve local density active sites, remains unknown because it difficult identify exact spatial location charge, with regard holes. Herein, we show that single particle level, plasmon-coupling-induced...

A primary motivation for studying topological matter regards the protection of order from its environment. In this work, we study a emitter array coupled to an electromagnetic The photon-emitter coupling produces nonlocal interactions between emitters. Using periodic boundary conditions all ranges environment-induced interactions, chiral symmetry inherent is preserved. This protects Hamiltonian and induces parity in Lindblad operator. phase transition occurs at critical related energy...

Photocatalytic production of chemicals and fuels with H2 evolution has raised broad interest due to the carbon emission-free feature. In this context, selective fast scission methanol C–H bonds for coproduction ethylene glycol (EG) over metal–semiconductor composites remains be achieved. Here, we demonstrate that indium nanoparticles (In NPs) a low work function (<4.3 eV) increase selectivity activity ZnIn2S4 bonds. By accepting electrons from NPs, enriched tends activate bond instead O–H...

Surface plasmon resonance-induced charge separation plays key roles in plasmon-related applications, especially photocatalysis and photovoltaics. Plasmon coupling nanostructures exhibit extraordinary behaviors hybrid states, phonon scattering, ultrafast dephasing, but plasmon-induced these materials remains unknown. Here, we design Schottky-free Au nanoparticle (NP)/NiO/Au nanoparticles-on-a-mirror plasmonic photocatalysts to support interfacial hole transfer, evidenced by surface...

We theoretically investigate the transport properties of a weak coherent input field scattered by an ensemble $\mathrm{\ensuremath{\Lambda}}$-type atoms coupled to one-dimensional photonic crystal waveguide. In our model, are randomly located in lattice along axis. analyze transmission spectrum mediated tunable long-range atomic interactions and observe highest-energy dip. The results show that dip location is associated with number atoms, which provides accurate measuring tool for...

ABSTRACT Understanding how applied voltage drives the electrocatalytic reaction at nanoscale is a fundamental scientific problem, particularly in non-metallic electrocatalysts, due to their low intrinsic carrier concentration. Herein, using monolayer molybdenum disulfide (MoS2) as model system of catalyst, potential drops across basal plane MoS2 (ΔVsem) and electric double layer (ΔVedl) are decoupled quantitatively function through in-situ surface microscopy. We visualize evolution band...

Quantum matter with exotic topological order has potential applications in quantum computation. However, present experiments, the manipulations on states are still challenging. We here propose an architecture for optical control of matter. consider a superconducting qubit array Su-Schrieffer-Heeger (SSH) Hamiltonian which couples to microwave cavity. Based parity properties array, we spectroscopy method observe phase transition, i.e., edge-to-bulk transition. This new can be achieved by...

We theoretically investigate the quantum scattering of a weak coherent input field interacting with an ensemble $\mathrm{\ensuremath{\Lambda}}$-type three-level atoms coupled to one-dimensional waveguide. With effective non-Hermitian Hamiltonian, we study collective interaction between mediated by waveguide mode. In our scheme, are randomly placed in lattice along axis Many interesting optical properties occur waveguide-atom system, such as electromagnetically induced transparency. quantify...

Abstract Controlling the interaction of polarization light with an asymmetric nanostructure such as a metal/semiconductor heterostructure provides opportunities for tuning surface plasmon excitation and near‐field spatial distribution. However, effects on interfacial charge transport photocatalysis plasmonic photocatalysts are unclear. Herein, we reveal dependence separation distribution in Au/TiO 2 nanoparticles under 45° incident illumination at single‐particle level using combination...

Optical mirrors determine cavity properties by means of light reflection. Imperfect reflection gives rise to open cavities with photon loss. We study an made atom-dimer a tunable spectrum. find that the atomic shows anti-$\mathcal{PT}$ symmetry. The phase transition controlled couplings in indicates emergence two degenerate supermodes. Interestingly, threshold mirror is identified for realizing strong coherent cavity-atom coupling. This reveals criterion produce good cavity. Moreover,...

We theoretically study the optical properties of an ensemble two-level atoms coupled to a one-dimensional waveguide. In our model, are randomly located in lattice sites along The results reveal that transport atomic influenced by constant and filling factor sites. also focus on mirror configuration quantify effect inhomogeneous broadening resonant transition scattering spectrum. Furthermore, we find initial bunching persistent quantum beats appear photon-photon correlation function...

The involvement between electron transfer (ET) and catalytic reaction at the electrocatalyst surface makes electrochemical process challenging to understand control. Even ET process, a primary step, is still ambiguous because it unclear how related nanostructured electrocatalyst. Herein, locally enhanced current dominated by mass transport effect corner edge sites bounded {111} facets on single Au triangular nanoplates was clearly imaged. After decoupling effect, rate constant of measured be...

We have proposed a sensor for real-time and online measurement of dew/frost point temperature using tunable diode laser absorption spectroscopy (TDLAS) technique. Initial experiments demonstrated its feasibility technical advantages in comparison to chilled mirror hygrometer (CMH). The TDLAS we developed has range from -93 °C + 14.5 °C, with uncertainly less than 2%, response time about 0.8 s, which is much faster that the (ranging several minutes hours). A TDLAS-based many advantages, such...

Collective quantum states, such as subradiant and superradiant are useful for controlling optical responses in many-body systems. In this work, we study novel collective phenomena waveguide-coupled Bragg atom arrays with inhomogeneous frequencies. For atoms without free-space dissipation, collectively induced transparency is produced by destructive interference between states. a large array, multi-frequency photon can be obtained considering different Interestingly, find absorption (CIA)...

Understanding the role of surface charges in catalytic reaction is great importance to fundamental science photoelectrochemistry (PEC). However, spatial heterogeneities charge transfer sites and at electrode/electrolyte interface obscures process. Herein, we quantified relationship between local current hydrogen evolution (HER) density using operando spatially resolved photovoltage microscopy on Pt/Ti array p-Si photoelectrode. We found that islands worked as main collect areas but sole...

Cold neutral atoms provide a versatile and controllable platform for emulating various quantum systems. Despite efforts to develop artificial gauge fields in these systems, realizing unique ideal-solenoid-shaped magnetic field within the domain any real-world physical system remains elusive. Here we propose scheme generate "hairline" solenoid with an extremely small size around 1 micrometer which is smaller than typical coherence length cold atoms. Correspondingly, interference effects will...