Breathers are localized structures that undergo a periodic oscillation in their duration and amplitude. Optical microresonators, benefiting from their high-quality factor, provide an ideal test bench for studying brea...Breathers are localized structures that undergo a periodic oscillation in their duration and amplitude. Optical microresonators, benefiting from their high-quality factor, provide an ideal test bench for studying breathing phenomena. In a monochromatically pumped microresonator system, intrinsic breathing instabilities are widely observed in the form of temporal dissipative Kerr solitons which only exist in the effectively red-detuned regime.Here, we demonstrate a novel bichromatic pumping scheme to create compulsive breathing microcombs via respectively distributing two pump lasers at the effectively blue-and red-detuned sides of a single resonance.We experimentally discover the artificial cnoidal wave breathers and molecular crystal-like breathers in a photonic chip-based silicon nitride microresonator and theoretically describe their intriguing temporal dynamics based on the bichromatic pumping Lugiato–Lefever equation. In particular, the corresponding breathing microcombs exhibit diverse comb line spacing ranging from 2 to 17 times the free spectral range of the microresonator.Our discovery not only provides a simple yet robust method to harness microcombs with reconfigurable comb line spacing but also reveals a new class of breathing waves in driven dissipative nonlinear systems.展开更多
Aqueous zinc(Zn)-ion batteries(AZIBs)present safe and environmentally friendly features thereby emerging as an attractive energy storage device.The V_(2)O_(5)-based cathodes are promising because of their high theoret...Aqueous zinc(Zn)-ion batteries(AZIBs)present safe and environmentally friendly features thereby emerging as an attractive energy storage device.The V_(2)O_(5)-based cathodes are promising because of their high theoretical capacity and energy density.However,insufficient interlayer distance,easy dissolution and structural collapse due to irreversible crystalline phase transition limit the development of V_(2)O_(5)cathodes in AZIBs.Herein,doubly modified V_(2)O_(5)-based cathode which was in-situ intercalated by polyaniline(PANI)and composited with MXene(Ti_(3)C_(2)T_(x))(denoted PVM)were synthesized by one-step method for the first time.The in situ intercalation of PANI provides a channel for the rapid diffusion of Zn2+and the heterogeneous structures effectively promote charge transfer and enable structural integrity of cathode during cycling.Meanwhile,the conductivity of PVM electrode is greatly improved.Specifically,the PVM electrode shows a superior rate performance of 82 mAh·g^(-1)after 2000 cycles at 10 A·g^(-1).And it shows high pseudocapacitance behavior(80.23%capacitor contribution ratio at 0.1 mV·s^(-1)).A novel method of intercalation composite modification for the cathode is proposed,which provides fundamental guidance for the development of high-performance cathodes for AZIBs.展开更多
基金Fundamental Research Funds for the Provincial Universities of Zhejiang (GK239909299001-026)Natural Science Foundation of Zhejiang Province (LQ24F050016)+2 种基金National Natural Science Foundation of China (61971065,62301195, 12261131503)Innovation Program for Quantum Science and Technology (2023ZD0301500)Shenzhen-Hong Kong Cooperation Zone for Technology and Innovation(HZQBKCZYB2020050)。
文摘Breathers are localized structures that undergo a periodic oscillation in their duration and amplitude. Optical microresonators, benefiting from their high-quality factor, provide an ideal test bench for studying breathing phenomena. In a monochromatically pumped microresonator system, intrinsic breathing instabilities are widely observed in the form of temporal dissipative Kerr solitons which only exist in the effectively red-detuned regime.Here, we demonstrate a novel bichromatic pumping scheme to create compulsive breathing microcombs via respectively distributing two pump lasers at the effectively blue-and red-detuned sides of a single resonance.We experimentally discover the artificial cnoidal wave breathers and molecular crystal-like breathers in a photonic chip-based silicon nitride microresonator and theoretically describe their intriguing temporal dynamics based on the bichromatic pumping Lugiato–Lefever equation. In particular, the corresponding breathing microcombs exhibit diverse comb line spacing ranging from 2 to 17 times the free spectral range of the microresonator.Our discovery not only provides a simple yet robust method to harness microcombs with reconfigurable comb line spacing but also reveals a new class of breathing waves in driven dissipative nonlinear systems.
基金This work was supported by the China Postdoctoral Science Foundation(Nos.2022M720420 and 2022TQ0031).
文摘Aqueous zinc(Zn)-ion batteries(AZIBs)present safe and environmentally friendly features thereby emerging as an attractive energy storage device.The V_(2)O_(5)-based cathodes are promising because of their high theoretical capacity and energy density.However,insufficient interlayer distance,easy dissolution and structural collapse due to irreversible crystalline phase transition limit the development of V_(2)O_(5)cathodes in AZIBs.Herein,doubly modified V_(2)O_(5)-based cathode which was in-situ intercalated by polyaniline(PANI)and composited with MXene(Ti_(3)C_(2)T_(x))(denoted PVM)were synthesized by one-step method for the first time.The in situ intercalation of PANI provides a channel for the rapid diffusion of Zn2+and the heterogeneous structures effectively promote charge transfer and enable structural integrity of cathode during cycling.Meanwhile,the conductivity of PVM electrode is greatly improved.Specifically,the PVM electrode shows a superior rate performance of 82 mAh·g^(-1)after 2000 cycles at 10 A·g^(-1).And it shows high pseudocapacitance behavior(80.23%capacitor contribution ratio at 0.1 mV·s^(-1)).A novel method of intercalation composite modification for the cathode is proposed,which provides fundamental guidance for the development of high-performance cathodes for AZIBs.
