We build a double quantum-dot system with Coulomb coupling and aim at studying connections among the entropy production,free energy,and information flow.By utilizing concepts in stochastic thermodynamics and graph the...We build a double quantum-dot system with Coulomb coupling and aim at studying connections among the entropy production,free energy,and information flow.By utilizing concepts in stochastic thermodynamics and graph theory analysis,Clausius and nonequilibrium free energy inequalities are built to interpret local second law of thermodynamics for subsystems.A fundamental set of cycle fluxes and affinities is identified to decompose two inequalities by using Schnakenberg's network theory.Results show that the thermodynamic irreversibility has energy-related and information-related contributions.A global cycle associated with the feedback-induced information flow would pump electrons against the bias voltage,which implements a Maxwell demon.展开更多
Various exciton species in transition metal dichalcogenides(TMDs),such as neutral excitons,trions(charged excitons),dark excitons,and biexcitons,have been individually discovered with distinct light-matter interaction...Various exciton species in transition metal dichalcogenides(TMDs),such as neutral excitons,trions(charged excitons),dark excitons,and biexcitons,have been individually discovered with distinct light-matter interactions.In terms of valley-spin locked band structures and electron-hole configurations,these exciton species demonstrate flexible control of emission light with degrees of freedom(DOFs)such as intensity,polarization,frequency,and dynamics.However,it remains elusive to fully manipulate different exciton species on demand for practical photonic applications.Here,we investigate the contrasting light-matter interactions to control multiple DOFs of emission light in a hybrid monolayer WSe2-Ag nanowire(NW)structure by taking advantage of various exciton species.These excitons,including trions,dark excitons,and biexcitons,are found to couple independently with propagating surface plasmon polaritons(SPPs)of Ag NW in quite different ways,thanks to the orientations of transition dipoles.Consistent with the simulations,the dark excitons and dark trions show extremely high coupling efficiency with SPPs,while the trions demonstrate directional chiral-coupling features.This study presents a crucial step towards the ultimate goal of exploiting the comprehensive spectrum of TMD excitons for optical information processing and quantum optics.展开更多
基金Project supported by the National Natural Science Foundation(Grant No.11805159)the First Batch of National First-class Undergraduate Courses of China(2020)+1 种基金the Natural Science Foundation of Fujian Province,China(Grant No.2019J05003)Teaching Research Program of Thermodynamics and Statistical Physics in the Institution of Higher Education of China(2019).
文摘We build a double quantum-dot system with Coulomb coupling and aim at studying connections among the entropy production,free energy,and information flow.By utilizing concepts in stochastic thermodynamics and graph theory analysis,Clausius and nonequilibrium free energy inequalities are built to interpret local second law of thermodynamics for subsystems.A fundamental set of cycle fluxes and affinities is identified to decompose two inequalities by using Schnakenberg's network theory.Results show that the thermodynamic irreversibility has energy-related and information-related contributions.A global cycle associated with the feedback-induced information flow would pump electrons against the bias voltage,which implements a Maxwell demon.
基金supported by National Key R&D Program of China(Grant No.2021YFA1401100)National Natural Science Foundation of China(NSFC,Grant No.62005202,12074297,62261160386)+5 种基金the Fundamental Research Funds for the Central Universities(No.2042023kf0195)Guangdong Basic and Applied Basic Research Foundation(No.2023A1515011222)China Postdoctoral Science Fund,No.4 Special Funding(Pre-Station)-2022TQ0235China Postdoctoral Science Fund,No.2 Special Funding(Pre-Station)-2020TQ0234.K.W.T.T.acknowledge support from JSPS KAKENHI(Grant Numbers 19H05790,20H00354,and 21H05233)A3 Foresight by JSPS.We thank the Core Facility of Wuhan University for the AFM measurements.
文摘Various exciton species in transition metal dichalcogenides(TMDs),such as neutral excitons,trions(charged excitons),dark excitons,and biexcitons,have been individually discovered with distinct light-matter interactions.In terms of valley-spin locked band structures and electron-hole configurations,these exciton species demonstrate flexible control of emission light with degrees of freedom(DOFs)such as intensity,polarization,frequency,and dynamics.However,it remains elusive to fully manipulate different exciton species on demand for practical photonic applications.Here,we investigate the contrasting light-matter interactions to control multiple DOFs of emission light in a hybrid monolayer WSe2-Ag nanowire(NW)structure by taking advantage of various exciton species.These excitons,including trions,dark excitons,and biexcitons,are found to couple independently with propagating surface plasmon polaritons(SPPs)of Ag NW in quite different ways,thanks to the orientations of transition dipoles.Consistent with the simulations,the dark excitons and dark trions show extremely high coupling efficiency with SPPs,while the trions demonstrate directional chiral-coupling features.This study presents a crucial step towards the ultimate goal of exploiting the comprehensive spectrum of TMD excitons for optical information processing and quantum optics.
