The existence of a single topologically protected edge state in the first bulk bandgap for acoustic/elastic valley Hall insulators(VHIs)with zigzag interface configurations(ZICs)is well known.However,in this work,we s...The existence of a single topologically protected edge state in the first bulk bandgap for acoustic/elastic valley Hall insulators(VHIs)with zigzag interface configurations(ZICs)is well known.However,in this work,we show that an ultra-broadband edgestate pair in this bandgap can be created using the inverse design by topology optimization.The valley Hall insulator design increases the operational bandwidth 121%compared with an existing valley Hall insulator from recent literature and exhibits extreme field confinement,where more than 99%of the field intensity is concentrated within three unit-cells from the interface.One-way propagation and topological robustness towards small cavity defects are confirmed for the full bandwidth.The exploitation of such edge-state pairs of valley Hall insulators opens an avenue for realizing broadband confined edge modes.In tests for disorder and bend defects,we show that the additional ZIC,with a different operational frequency interval,encountered at the defects,degrades the transmission for bend and disorder defects which may prove significant for the application of VHIs.Through an alternative topology optimization method based on two ZICs,we further increase their common operational bandwidth.展开更多
Co-catalyst engineering has significantly bolstered the tunable photoinduced charge migration/separation in solar-driven photoelectrochemical(PEC)technology,but intricate synthesis procedures,unfavorable long-term sta...Co-catalyst engineering has significantly bolstered the tunable photoinduced charge migration/separation in solar-driven photoelectrochemical(PEC)technology,but intricate synthesis procedures,unfavorable long-term stability,high cost,and difficult interface configuration modulation retard the exploration of robust,stable,easily accessible,novel and highly efficient artificial photosystems.Herein,we conceptually unravel that a solid non-conjugated insulating polymer of poly(allylamine hydrochloride)(PAH)is able to function as an ideal interfacial co-catalyst to accelerate the charge separation of metal oxide(MO)substrates.展开更多
基金supported by the China Scholarship Council(CSC)the Danmarks Grundforskningsfond(Grant No.DNRF147)。
文摘The existence of a single topologically protected edge state in the first bulk bandgap for acoustic/elastic valley Hall insulators(VHIs)with zigzag interface configurations(ZICs)is well known.However,in this work,we show that an ultra-broadband edgestate pair in this bandgap can be created using the inverse design by topology optimization.The valley Hall insulator design increases the operational bandwidth 121%compared with an existing valley Hall insulator from recent literature and exhibits extreme field confinement,where more than 99%of the field intensity is concentrated within three unit-cells from the interface.One-way propagation and topological robustness towards small cavity defects are confirmed for the full bandwidth.The exploitation of such edge-state pairs of valley Hall insulators opens an avenue for realizing broadband confined edge modes.In tests for disorder and bend defects,we show that the additional ZIC,with a different operational frequency interval,encountered at the defects,degrades the transmission for bend and disorder defects which may prove significant for the application of VHIs.Through an alternative topology optimization method based on two ZICs,we further increase their common operational bandwidth.
基金supported by the National Natural Science Foundation of China(No.21703038,22072025)The financial support from the State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Science is acknowledged(No.20240018).
文摘Co-catalyst engineering has significantly bolstered the tunable photoinduced charge migration/separation in solar-driven photoelectrochemical(PEC)technology,but intricate synthesis procedures,unfavorable long-term stability,high cost,and difficult interface configuration modulation retard the exploration of robust,stable,easily accessible,novel and highly efficient artificial photosystems.Herein,we conceptually unravel that a solid non-conjugated insulating polymer of poly(allylamine hydrochloride)(PAH)is able to function as an ideal interfacial co-catalyst to accelerate the charge separation of metal oxide(MO)substrates.
