Chirality in confined nanospaces has brought some new insights into chirality transfer,amplification,and chiroptical properties.However,chirality switching,which is a common phenomenon in biological systems,has never ...Chirality in confined nanospaces has brought some new insights into chirality transfer,amplification,and chiroptical properties.However,chirality switching,which is a common phenomenon in biological systems,has never been realized in confined environments.Herein,we report a type of hexagonal metallacages that shows good host-vip interactions with ethoxy pillar[5]arene and pillar[6]arene,as confirmed by single-crystal X-ray analysis.Importantly,when a chiral pillar[5]arene-based molecular universal joint(MUJ)is used as the vip,the host-vip complexation would drive the alkyl ring of the MUJ flip from outside to inside the cavity of its pillar[5]arene unit,which enables the configuration change along with the chirality inversion of the MUJ.Moreover,the host-vip complexation facilitates the chirality transfer from vips to hosts,giving circularly polarized luminescence to the system.This study provides a unique metallacage-pillararene recognition motif for the chirality switching of planar chiral pillararenes,which will promote the construction of host-vip systems with tunable chirality for advanced applications.展开更多
Based on the nonequilibrium Green function method and density functional theory calculations, we theoretically investigate the effect of chirality on the electronic transport properties of thioxanthene-based molecular...Based on the nonequilibrium Green function method and density functional theory calculations, we theoretically investigate the effect of chirality on the electronic transport properties of thioxanthene-based molecular switch. The molecule comprises the switch which can exhibit different chiralities, that is, cis-form and trans-form by ultraviolet or visible irradiation. The results clearly reveal that the switching behaviors can be realized when the molecule converts between cis-form and trans-form. ~urthermore, the on-off ratio can be modulated by the chirality of the carbon nanotube electrodes. The maximum on-off ratio can reach 109 at 0.4 V for the armchair junction, suggesting potential applications of this type of junctions in future design of functional molecular devices.展开更多
Recently circularly polarized luminescence(CPL)materials have attracted significant interest.Introducing reversible dynamic property to these materials has been a key focus in cutting-edge fields,such as in high-level...Recently circularly polarized luminescence(CPL)materials have attracted significant interest.Introducing reversible dynamic property to these materials has been a key focus in cutting-edge fields,such as in high-level information encryption.Here,we provided a novel and general strategy involving handednessselective filtration and ground-state chiral self-recovery(CSR)in double film system to address this issue.Based on this strategy,we achieved CPL switch through the reversible modulation of ground-state chirality including absorption and scattering circular dichroism(CD)signals over the full UV-visible wavelength range(365-700 nm)in a single azobenzene polymer(PAzo)film.More importantly,by flexibly changing the type of fluorescent films,it is convenient to achieve general excited-state CSR,that is reversible switching of full-color including ideal white(CIE coordinate(0.33,0.33)),as well as room-temperature phosphorescent CPL.All these CPL signals without almost any intensity decay after three cycles of onand-off switching.Experimental results indicated that the trans-cis isomerization and ordered rearrangement of azobenzene units in PAzo film were the fundamental reasons for realizing CPL switching.Finally,based on this system we achieved dynamic visual encryption and decryption process including multiple decryption methods.This study provides an effective method for constructing a universally applicable chiroptical switch in excited state.展开更多
Linearly polarized(LP)modes are popular for fiber-optic communication systems,yet on-chip LP mode manipulation remains challenging.We propose a method for chiral switching of LP modes without encircling exceptional po...Linearly polarized(LP)modes are popular for fiber-optic communication systems,yet on-chip LP mode manipulation remains challenging.We propose a method for chiral switching of LP modes without encircling exceptional points in non-Hermitian systems.By adjusting one waveguide's radius and trajectory in a dual-coupled system,chiral LP mode switching is achieved,with output direction determined by the path.More importantly,the proposed device can simultaneously support two polarization states,which is highly significant for compatibility with polarization-division multiplexing systems.展开更多
Magnetic vortices hold great promise for advanced information storage applications due to their quartet degenerate states and high topological stability.The key to their application lies on meticulous control of its p...Magnetic vortices hold great promise for advanced information storage applications due to their quartet degenerate states and high topological stability.The key to their application lies on meticulous control of its polarity and chirality,which traditionally relies on magnetic fields,currents,and spin waves.However,the vortex core’s intrinsic precession under these stimuli hampers fast switching of the polarity and chirality.Here,we demonstrate a fast and precise control of polarity and chirality in magnetic vortices using combined femtosecond(fs)laser and tiny magnetic fields via micromagnetic simulations on Permalloy nanodisks.The fs laser pulse induces an ultrafast quench effect to establish the initial paramagnetic state,while the simultaneously applied magnetic fields precisely target the final vortex structure.Intriguingly,a 110 mT out-ofplane field and a 7 mT in-plane circular field are sufficient to realize precise control of the polarity and chirality on sub-nanosecond time scale,respectively,which are much lower than that of the previous work.Our approach guarantees fast and reliable switching of magnetic vortex polarity and chirality,paving the groundwork for a high-speed quaternary data storage and contributing a novel perspective to the fundamentals of spintronics.展开更多
Dissipative Rydberg gases are an outstanding platform for the investigation of many-body open systems.Despite the wealth of existing studies,the non-equilibrium dynamics of dissipative Rydberg gases has rarely been ex...Dissipative Rydberg gases are an outstanding platform for the investigation of many-body open systems.Despite the wealth of existing studies,the non-equilibrium dynamics of dissipative Rydberg gases has rarely been examined or harnessed through the lens of non-Hermitian physics,which is intrinsic to open systems.Here we report the experimental observation of chiral switching between many-body steady states in a dissipative thermal Rydberg vapor,which is underlain by an exceptional structure in the Liouvillian eigenspectrum of the system.Similar to typical chiral state transfer in non-Hermitian systems,as the parameters are adiabatically varied around a closed contour,depending on the chirality of the parameter modulation,the Rydberg vapor can change between two collective steady states with distinct Rydberg excitations and optical transmissions.Adopting a mean-field description,we reveal that both the existence of the bistable steady states and chiral dynamics derive from the Liouvillian exceptional structure,where two exceptional lines merge at a higher-order exceptional point.Such a non-Hermitian perspective of the dissipative Rydberg gas not only provides a new paradigm for chiral mode switching through many-body parameters,as we demonstrate experimentally,but also paves the way for devising novel applications based on the unique features of non-Hermitian physics.展开更多
In this paper,a method to excite chiral quasi-bound states in the continuum(Q-BICs)using an asymmetric interface is proposed for the first time,to our knowledge.The chirality of a metasurface can be controlled by vary...In this paper,a method to excite chiral quasi-bound states in the continuum(Q-BICs)using an asymmetric interface is proposed for the first time,to our knowledge.The chirality of a metasurface can be controlled by varying the medium of the active layer,achieving a maximum circular dichroism(CD)value of 0.9.Two types of reconfigurable chiral Q-BIC metasurfaces,a single-biased chiral Q-BIC metasurface(SBCBM)and a dual-biased chiral Q-BIC metasurface(DBCBM),are proposed,facilitated by the use of the electronically controlled material polyaniline(PANI).This enables electrically reconfigurable chiral Q-BIC with a maximum CD variability range from-0.9 to+0.9.These results highlight significant potential applications in fields such as reconfigurable devices,optical chiral switching,and environmental monitoring.展开更多
基金National Natural Science Foundation of China,Grant/Award Numbers:22301238,22171219,22222112Innovation Talent Promotion Plan of Shaanxi Province for Science and Technology Innovation Team,Grant/Award Number:2023-CX-TD-51+6 种基金China Postdoctoral Science Foundation,Grant/Award Number:2023M732161Xi’an Association for Science and Technology Youth Talent Support Program,Grant/Award Number:20240345Key Research and Development Program of Shaanxi,Grant/Award Numbers:2020GXLH-Y-019,2022KXJ-141Innovation Capability Support Program of Shaanxi,Grant/Award Numbers:2019GHJD-14,2021TD-40Science and Technology Talent Support Program of Shaanxi Provincial People’s Hospital,Grant/Award Number:2021LJ-05Technology Innovation Leading Program of Shaanxi,Grant/Award Number:2022KXJ-141Science and Technology Program of Xi’an,Grant/Award Number:23ZDCYJSGG0037-2022。
文摘Chirality in confined nanospaces has brought some new insights into chirality transfer,amplification,and chiroptical properties.However,chirality switching,which is a common phenomenon in biological systems,has never been realized in confined environments.Herein,we report a type of hexagonal metallacages that shows good host-vip interactions with ethoxy pillar[5]arene and pillar[6]arene,as confirmed by single-crystal X-ray analysis.Importantly,when a chiral pillar[5]arene-based molecular universal joint(MUJ)is used as the vip,the host-vip complexation would drive the alkyl ring of the MUJ flip from outside to inside the cavity of its pillar[5]arene unit,which enables the configuration change along with the chirality inversion of the MUJ.Moreover,the host-vip complexation facilitates the chirality transfer from vips to hosts,giving circularly polarized luminescence to the system.This study provides a unique metallacage-pillararene recognition motif for the chirality switching of planar chiral pillararenes,which will promote the construction of host-vip systems with tunable chirality for advanced applications.
基金Supported by the National Natural Science Foundation of China under Grant No 11004156the Natural Science Foundation of Shaanxi Province under Grant No 2014JM1025+2 种基金the Science and Technology Star Project of Shaanxi Province under Grant No2016KJXX-38the Special Foundation of Key Academic Subjects Development of Shaanxi Province under Grant No 2008-169the Xi'an Polytechnic University Young Scholar Supporting Plan under Grant No 2013-06
文摘Based on the nonequilibrium Green function method and density functional theory calculations, we theoretically investigate the effect of chirality on the electronic transport properties of thioxanthene-based molecular switch. The molecule comprises the switch which can exhibit different chiralities, that is, cis-form and trans-form by ultraviolet or visible irradiation. The results clearly reveal that the switching behaviors can be realized when the molecule converts between cis-form and trans-form. ~urthermore, the on-off ratio can be modulated by the chirality of the carbon nanotube electrodes. The maximum on-off ratio can reach 109 at 0.4 V for the armchair junction, suggesting potential applications of this type of junctions in future design of functional molecular devices.
基金the financial support from the National Natural Science Foundation of China(Nos.22301206,92356305 and 22301208)Natural Science Foundation of Anhui Province(No.2308085J15)+5 种基金Natural Science Foundation of Anhui Provincial Higher Education Institutions(No.2023AH010012)China Post-doctoral Science Foundation(No.2022M722312)the Key Laboratory of Polymeric Material Design and Synthesis for Biomedical Functionthe Priority Academic Program Development(PAPD)of Jiangsu Higher Education InstitutionsJiangsu Funding Program for Excellent Postdoctoral Talentthe Program of Innovative Research Team of Soochow University。
文摘Recently circularly polarized luminescence(CPL)materials have attracted significant interest.Introducing reversible dynamic property to these materials has been a key focus in cutting-edge fields,such as in high-level information encryption.Here,we provided a novel and general strategy involving handednessselective filtration and ground-state chiral self-recovery(CSR)in double film system to address this issue.Based on this strategy,we achieved CPL switch through the reversible modulation of ground-state chirality including absorption and scattering circular dichroism(CD)signals over the full UV-visible wavelength range(365-700 nm)in a single azobenzene polymer(PAzo)film.More importantly,by flexibly changing the type of fluorescent films,it is convenient to achieve general excited-state CSR,that is reversible switching of full-color including ideal white(CIE coordinate(0.33,0.33)),as well as room-temperature phosphorescent CPL.All these CPL signals without almost any intensity decay after three cycles of onand-off switching.Experimental results indicated that the trans-cis isomerization and ordered rearrangement of azobenzene units in PAzo film were the fundamental reasons for realizing CPL switching.Finally,based on this system we achieved dynamic visual encryption and decryption process including multiple decryption methods.This study provides an effective method for constructing a universally applicable chiroptical switch in excited state.
基金supported by the National Natural Science Foundation of China(Nos.62125503 and 62261160388)the Natural Science Foundation of Hubei Province(No.2023AFA028)+3 种基金the Technology Innovation Program of Hubei Province(Major Science and Technology Project)(No.2024BAA001)the Hubei Optical Fundamental Research Center(No.HBO2025TQ004)the High Quality Development Special Project of the Ministry of Industry and Information Technologythe China Association for Science and Technology Youth Talent Support Engineering Doctoral Program。
文摘Linearly polarized(LP)modes are popular for fiber-optic communication systems,yet on-chip LP mode manipulation remains challenging.We propose a method for chiral switching of LP modes without encircling exceptional points in non-Hermitian systems.By adjusting one waveguide's radius and trajectory in a dual-coupled system,chiral LP mode switching is achieved,with output direction determined by the path.More importantly,the proposed device can simultaneously support two polarization states,which is highly significant for compatibility with polarization-division multiplexing systems.
基金supported by the National Key Research and Development Program of China(Grant No.2020YFA0309300)the National Natural Science Foundation of China(NSFC)(Grant Nos.12127803 and 12304146)+5 种基金China Postdoctoral Science Foundation(No.2023M741828)Science and Technology Projects in Guangzhou(Grant No.202201000008)Guangdong Basic and Applied Basic Research Foundation(Grant Nos.2021B1515120047 and 2023B1515020112)the Natural Science Foundation of Tianjin(Grant No.20JCJQJC00210)the 111 Project(Grant No.B23045)the“Fundamental Research Funds for the Central Universities”,Nankai University(Grant Nos.63213040,C029211101,C02922101,ZB22000104,DK2300010207,63243194,and 9242000728).
文摘Magnetic vortices hold great promise for advanced information storage applications due to their quartet degenerate states and high topological stability.The key to their application lies on meticulous control of its polarity and chirality,which traditionally relies on magnetic fields,currents,and spin waves.However,the vortex core’s intrinsic precession under these stimuli hampers fast switching of the polarity and chirality.Here,we demonstrate a fast and precise control of polarity and chirality in magnetic vortices using combined femtosecond(fs)laser and tiny magnetic fields via micromagnetic simulations on Permalloy nanodisks.The fs laser pulse induces an ultrafast quench effect to establish the initial paramagnetic state,while the simultaneously applied magnetic fields precisely target the final vortex structure.Intriguingly,a 110 mT out-ofplane field and a 7 mT in-plane circular field are sufficient to realize precise control of the polarity and chirality on sub-nanosecond time scale,respectively,which are much lower than that of the previous work.Our approach guarantees fast and reliable switching of magnetic vortex polarity and chirality,paving the groundwork for a high-speed quaternary data storage and contributing a novel perspective to the fundamentals of spintronics.
基金supported by the Innovation Program for Quantum Science and Technology(2024ZD0300900)the National Natural Science Foundation of China(12134014,61905234,11974335,12374337,and 12374479)+3 种基金the Key Research Program of Frontier Sciences,CAS(QYZDYSSW-SLHO03)University of Science and Technology of China Research Funds of the Double First-Class Initiative(YD2030002007)the Fundamental Research Funds for the Central Universities(WK2470000035)the Innovation Program for Quantum Science and Technology(2021ZD0301200).
文摘Dissipative Rydberg gases are an outstanding platform for the investigation of many-body open systems.Despite the wealth of existing studies,the non-equilibrium dynamics of dissipative Rydberg gases has rarely been examined or harnessed through the lens of non-Hermitian physics,which is intrinsic to open systems.Here we report the experimental observation of chiral switching between many-body steady states in a dissipative thermal Rydberg vapor,which is underlain by an exceptional structure in the Liouvillian eigenspectrum of the system.Similar to typical chiral state transfer in non-Hermitian systems,as the parameters are adiabatically varied around a closed contour,depending on the chirality of the parameter modulation,the Rydberg vapor can change between two collective steady states with distinct Rydberg excitations and optical transmissions.Adopting a mean-field description,we reveal that both the existence of the bistable steady states and chiral dynamics derive from the Liouvillian exceptional structure,where two exceptional lines merge at a higher-order exceptional point.Such a non-Hermitian perspective of the dissipative Rydberg gas not only provides a new paradigm for chiral mode switching through many-body parameters,as we demonstrate experimentally,but also paves the way for devising novel applications based on the unique features of non-Hermitian physics.
基金National Natural Science Foundation of China(61205095)。
文摘In this paper,a method to excite chiral quasi-bound states in the continuum(Q-BICs)using an asymmetric interface is proposed for the first time,to our knowledge.The chirality of a metasurface can be controlled by varying the medium of the active layer,achieving a maximum circular dichroism(CD)value of 0.9.Two types of reconfigurable chiral Q-BIC metasurfaces,a single-biased chiral Q-BIC metasurface(SBCBM)and a dual-biased chiral Q-BIC metasurface(DBCBM),are proposed,facilitated by the use of the electronically controlled material polyaniline(PANI).This enables electrically reconfigurable chiral Q-BIC with a maximum CD variability range from-0.9 to+0.9.These results highlight significant potential applications in fields such as reconfigurable devices,optical chiral switching,and environmental monitoring.
