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Nanograin network memory with reconfigurable percolation paths for synaptic interactions
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作者 Hoo-Cheol Lee Jungkil kim +6 位作者 ha-reem kim Kyoung-Ho kim Kyung-Jun Park Jae-Pil So Jung Min Lee Min-Soo Hwang Hong-Gyu Park 《Light(Science & Applications)》 SCIE EI CSCD 2023年第6期1040-1050,共11页
The development of memory devices with functions that simultaneously process and store data is required for efficient computation.To achieve this,artificial synaptic devices have been proposed because they can constru... The development of memory devices with functions that simultaneously process and store data is required for efficient computation.To achieve this,artificial synaptic devices have been proposed because they can construct hybrid networks with biological neurons and perform neuromorphic computation.However,irreversible aging of these electrical devices causes unavoidable performance degradation.Although several photonic approaches to controlling currents have been suggested,suppression of current levels and switching of analog conductance in a simple photonic manner remain challenging.Here,we demonstrated a nanograin network memory using reconfigurable percolation paths in a single Si nanowire with solid core/porous shell and pure solid core segments.The electrical and photonic control of current percolation paths enabled the analog and reversible adjustment of the persistent current level,exhibiting memory behavior and current suppression in this single nanowire device.In addition,the synaptic behaviors of memory and erasure were demonstrated through potentiation and habituation processes.Photonic habituation was achieved using laser illumination on the porous nanowire shell,with a linear decrease in the postsynaptic current.Furthermore,synaptic elimination was emulated using two adjacent devices interconnected on a single nanowire.Therefore,electrical and photonic reconfiguration of the conductive paths in Si nanograin networks will pave the way for next-generation nanodevice technologies. 展开更多
关键词 electrical PERCOLATION NETWORK
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Room-temperature lasing from nanophotonic topological cavities 被引量:8
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作者 Daria Smirnova Aditya Tripathi +4 位作者 Sergey Kruk Min-Soo Hwang ha-reem kim Hong-Gyu Park Yuri Kivshar 《Light(Science & Applications)》 SCIE EI CAS CSCD 2020年第1期823-830,共8页
The study of topological phases of light underpins a promising paradigm for engineering disorder-immune compact photonic devices with unusual properties.Combined with an optical gain,topological photonic structures pr... The study of topological phases of light underpins a promising paradigm for engineering disorder-immune compact photonic devices with unusual properties.Combined with an optical gain,topological photonic structures provide a novel platform for micro-and nanoscale lasers,which could benefit from nontrivial band topology and spatially localized gap states.Here,we propose and demonstrate experimentally active nanophotonic topological cavities incorporating Ⅲ-Ⅴ semiconductor quantum wells as a gain medium in the structure.We observe room-temperature lasing with a narrow spectrum,high coherence,and threshold behaviour.The emitted beam hosts a singularity encoded by a triade cavity mode that resides in the bandgap of two interfaced valley-Hall periodic photonic lattices with opposite parity breaking.Our findings make a step towards topologically controlled ultrasmall light sources with nontrivial radiation characteristics. 展开更多
关键词 LASING SINGULARITY NARROW
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