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非掺杂型Si/SiGe异质结外延与表征
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作者 耿鑫 张结印 +9 位作者 卢文龙 明铭 刘方泽 符彬啸 褚逸昕 颜谋回 王保传 张新定 郭国平 张建军 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第11期297-304,共8页
以自旋为编码单元的硅基半导体量子计算与传统微电子工艺兼容,易拓展且可以同位素纯化提高退相干时间,因而备受关注.本研究工作通过分子束外延生长了高质量非掺杂型Si/SiGe异质结并测试了二维电子气迁移率.球差电镜观察到原子级尖锐界面... 以自旋为编码单元的硅基半导体量子计算与传统微电子工艺兼容,易拓展且可以同位素纯化提高退相干时间,因而备受关注.本研究工作通过分子束外延生长了高质量非掺杂型Si/SiGe异质结并测试了二维电子气迁移率.球差电镜观察到原子级尖锐界面,原子力显微镜表征显示其表面均方根粗糙度仅为0.44 nm,低温下迁移率达到20.21×10^(4)cm^(2)·V^(–1)·s^(–1).不同栅压下载流子浓度和迁移率的幂指数为1.026,材料丁格比值在7—12之间,表明载流子主要受到背景杂质散射和半导体/氧化物的界面散射. 展开更多
关键词 Si/SiGe异质结 二维电子气 霍尔迁移率 硅基量子计算
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基于DEA-TOPSIS模型的水上应急资源配置效率评价 被引量:7
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作者 郭国平 周超林 +2 位作者 吴兵 陈厚忠 王新立 《安全与环境学报》 CAS CSCD 北大核心 2019年第1期134-139,共6页
合理配置水上应急资源能有效提升水上搜救效率。在建立了3层评价指标体系的基础上,以应急资源加权的投入产出比为目标函数,引入数据包络分析方法构建了水上应急资源配置效率评价模型,并结合逼近理想排序法对救援效率进行综合排序。以长... 合理配置水上应急资源能有效提升水上搜救效率。在建立了3层评价指标体系的基础上,以应急资源加权的投入产出比为目标函数,引入数据包络分析方法构建了水上应急资源配置效率评价模型,并结合逼近理想排序法对救援效率进行综合排序。以长江江苏段10个分支局的应急资源配置为例,获取各分支局的投入冗余值,并对其进行排序。结果表明,该模型能获取应急资源配置的冗余程度,从而分析水上应急资源配置效率,为海事主管机关优化水上应急资源配置提供借鉴。 展开更多
关键词 安全工程 DEA TOPSIS 水上应急资源配置 效率评价
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具有水上事故特征的目标P-中位应急救助选址优化及方法 被引量:4
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作者 郭国平 王庆珺 +1 位作者 吴兵 张春玮 《安全与环境学报》 CAS CSCD 北大核心 2018年第3期1047-1052,共6页
科学地进行应急救助基地选址是提高应急资源利用效率和应急服务水平的关键,以南京海事辖区为例,对事故多发水域应急救助基地的布局规划和覆盖分配进行了优化研究。总结了辖区水域中影响应急救助站点选址的因素,有辖区事故重点水域分布... 科学地进行应急救助基地选址是提高应急资源利用效率和应急服务水平的关键,以南京海事辖区为例,对事故多发水域应急救助基地的布局规划和覆盖分配进行了优化研究。总结了辖区水域中影响应急救助站点选址的因素,有辖区事故重点水域分布、桥区水域、锚地3个因素,运用DBSCAN算法确定了辖区事故重点水域的分布情况,结合桥区水域、锚地影响因素,引入安全风险权重系数,利用P-中位建立了应急救助站点选址数学模型。构建的选址模型目标函数在满足设置的约束条件下取最小值,即实现了救援用时最少或救援距离最短。最后运用免疫算法求解选址优化数学模型。经过计算,在考虑时效性的基础上,较好地实现了应急救助对辖区水域的全覆盖和重点水域的重点覆盖。 展开更多
关键词 公共安全 DBSCAN算法 P-中位 免疫算法 选址
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Charge States and Transition of Double Quantum Dot in the Few-Electron Regime
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作者 ZHOU Cheng WANG Li +3 位作者 TU Tao HAN Tian-Yi LI Hai-Ou guo guo-ping 《Chinese Physics Letters》 SCIE CAS CSCD 2013年第5期1-3,共3页
We present transport characterizations of a fully tunable double quantum dot over the few electron number down to zero,which is defined by means of surface gates on top of a GaAs/AlGaAs heterostructure.We also perform... We present transport characterizations of a fully tunable double quantum dot over the few electron number down to zero,which is defined by means of surface gates on top of a GaAs/AlGaAs heterostructure.We also perform numerical simulations to map out the charge stability diagram,which is consistent with the measurements.The results demonstrate that the electric control in the double dot can be significantly enhanced by improving the design of the device structure,which provides potential advantages for quantum information processing. 展开更多
关键词 QUANTUM TRANSITION ELECTRON
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Transport through a Gate Tunable Graphene Double Quantum Dot
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作者 ZHOU Cheng TU Tao +4 位作者 WANG Li LI Hai-Ou CAO Gang guo Guang-Can guo guo-ping 《Chinese Physics Letters》 SCIE CAS CSCD 2012年第11期194-197,共4页
We demonstrate how molecular states of coupled graphene quantum dots are probed in transport experiments.The applied method measures the sequential tunneling of electrons through the double dot and hence resolves the ... We demonstrate how molecular states of coupled graphene quantum dots are probed in transport experiments.The applied method measures the sequential tunneling of electrons through the double dot and hence resolves the molecular state transport channel simultaneously.The overlap of the two dots'wavefunctions,and in turn,the tunnel coupling between the two dots are controlled by the local gates.These results imply the relevance of our graphene device for implementing a quantum manipulation by adjusting the electrodes. 展开更多
关键词 hence OVERLAP QUANTUM
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Pulse Designed Coherent Dynamics of a Quantum Dot Charge Qubit
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作者 CAO Gang WANG Li +3 位作者 TU Tao LI Hai-Ou XIAO Ming guo guo-ping 《Chinese Physics Letters》 SCIE CAS CSCD 2012年第3期29-32,共4页
We propose an effective method to design the working parameters of a pulse-driven charge qubit implemented with double quantum dot.It is shown that intrinsic qubit population leakage to undesired states in the control... We propose an effective method to design the working parameters of a pulse-driven charge qubit implemented with double quantum dot.It is shown that intrinsic qubit population leakage to undesired states in the control and measurement process can be determined by the simulation of coherent dynamics of the qubit and minimized by choosing proper working parameters such as pulse shape.The result demonstrated here bodes well for future quantum gate operations and quantum computing applications. 展开更多
关键词 QUANTUM operations DESIRED
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Multipartite Spin Entangled States in Quantum Dots with a Quantum Databus Based on Nano Electro-Mechanical Resonator
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作者 ZHU Zhi-Cheng TU Tao guo guo-ping 《Chinese Physics Letters》 SCIE CAS CSCD 2011年第4期19-21,共3页
We propose an efficient method to create multipartite spin entangled states in quantum dots coupled to a nano electro-mechanical resonator array.Our method,based on the interaction between electron spins confined in q... We propose an efficient method to create multipartite spin entangled states in quantum dots coupled to a nano electro-mechanical resonator array.Our method,based on the interaction between electron spins confined in quantum dots and the motion of magnetized nano electro-mechanical resonators,can enable a coherent spin-spin coupling over long distances and in principle be applied to an arbitrarily large number of electronic spins. 展开更多
关键词 QUANTUM arbitrarily parti
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Ground States and Excited States in a Tunable Graphene Quantum Dot
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作者 WANG Lin-Jun CAO Gang +5 位作者 TU Tao LI Hai-Ou ZHOU Cheng HAO Xiao-Jie guo Guang-Can guo guo-ping 《Chinese Physics Letters》 SCIE CAS CSCD 2011年第6期248-250,共3页
We prepare an etched gate tunable quantum dot in single-layer graphene and present transport measurement in this system.We extract the information of the ground states and excited states of the graphene quantum dot,as... We prepare an etched gate tunable quantum dot in single-layer graphene and present transport measurement in this system.We extract the information of the ground states and excited states of the graphene quantum dot,as denoted by the presence of characteristic Coulomb blockade diamond diagrams.The results demonstrate that the quantum dot in single-layer graphene bodes well for future quantum transport study and quantum computing applications. 展开更多
关键词 QUANTUM EXCITED STATES
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基于FAHP-云模型的CAPE型船舶内河航行安全评估 被引量:9
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作者 刘超凡 郭国平 +1 位作者 吴兵 吕洁印 《武汉理工大学学报》 CAS 2021年第7期29-35,47,共8页
针对内河通航环境特点和CAPE型船舶航行性能特点,筛选航行安全风险因子,建立CAPE型船舶航行安全风险分析模型,以FAHP(模糊层次分析法)求取各风险因子权重,再结合云模型运算规则,获取目标事件风险等级。以长江江阴水道为例,建立基于FAHP... 针对内河通航环境特点和CAPE型船舶航行性能特点,筛选航行安全风险因子,建立CAPE型船舶航行安全风险分析模型,以FAHP(模糊层次分析法)求取各风险因子权重,再结合云模型运算规则,获取目标事件风险等级。以长江江阴水道为例,建立基于FAHP-云模型的CAPE型船舶航行风险评估模型。经过模型分析,绘制CAPE型船舶在航道航行的风险云图,直观获得航行风险等级为"一般风险"。评估结果与水域实际情况符合,其为主管机关判断CAPE型船舶可否进入内河相应航段航行的决策起到技术支撑作用;同时对CAPE型船舶航行安全保障方案提供借鉴。 展开更多
关键词 FAHP-云模型 CAPE型船舶 内河航行 通航风险分析
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