Interface enhanced superconductivity over 50 K has been discovered in monolayer Fe Se films grown on several TiO_2-terminated oxide substrates.Whether such phenomenon exists in other oxide substrates remains an extrem...Interface enhanced superconductivity over 50 K has been discovered in monolayer Fe Se films grown on several TiO_2-terminated oxide substrates.Whether such phenomenon exists in other oxide substrates remains an extremely interesting topic.Here we report enhanced superconductivity with an onset transition temperature of 18 K in monolayer Fe Se on Mg O(001) substrate by transport measurement.Scanning transmission electron microscopy investigation on the interface structure indicates that Fe Se films grow epitaxially on Mg O(001) and that overlayer Fe atoms diffuse into the top two layers of Mg O and substitute Mg atoms.Our density functional theory calculations reveal that this substitution promotes the charge transfer from the Mg O substrate to the Fe Se films,an essential process that also occurs in monolayer Fe Se on TiO_2-terminated oxides and contributes to the enhanced superconductivity therein.Our finding suggests that superconductivity enhancement in monolayer Fe Se films on oxides substrates is rather general as long as charge transfer is allowed at the interface,thus pointing out an explicit direction for searching for new high temperature superconductivity by interface engineering.展开更多
VIA是用户级集群系统工业标准.深入研究了VIA的规范和协议,设计和实现了一种高性能的用户级网卡--XUNI(PCI-X based user lever network interface),达到高带宽、低延迟,系统具有良好的计算通信重叠性.该网卡可以用于集群系统,也非常适...VIA是用户级集群系统工业标准.深入研究了VIA的规范和协议,设计和实现了一种高性能的用户级网卡--XUNI(PCI-X based user lever network interface),达到高带宽、低延迟,系统具有良好的计算通信重叠性.该网卡可以用于集群系统,也非常适用于高速网络存储系统.展开更多
Y2000-62527-3 0103997路由选择和交换(含6篇论文)=Routing and switching[会,英]//Proceedings of 14th International Parallel &Distributed Processing Symposium.—3～52(HC)本部分6篇论文的内容有:多媒体路由仪的交换调度,高...Y2000-62527-3 0103997路由选择和交换(含6篇论文)=Routing and switching[会,英]//Proceedings of 14th International Parallel &Distributed Processing Symposium.—3～52(HC)本部分6篇论文的内容有:多媒体路由仪的交换调度,高性能多用户系统区域网接口卡的微结构,电路交换模型中超立方广播,极多网络中路由选择性能改进,IBM SP 交换互联 NT 集群的有效虚拟接口结构支持,在似 RS/6000 SP 的双向多级互联网络中的自适应路由选择。展开更多
针对IA-64平台地址空间和数据空间的特点,该文给出一种简单有效的地址转换与数据表示方法,在此基础上提出可以有效保持虚拟接口结构(v irtua l in terfacearch itecture,V IA)各层抽象描述与具体实现相一致的设计方案。在自主研制的V I...针对IA-64平台地址空间和数据空间的特点,该文给出一种简单有效的地址转换与数据表示方法,在此基础上提出可以有效保持虚拟接口结构(v irtua l in terfacearch itecture,V IA)各层抽象描述与具体实现相一致的设计方案。在自主研制的V IA通信硬件基础上,实现了一个软硬件有机结合的实例THV IA 64。测试结果表明THV IA 64不仅可以稳定运行,而且具有很高的通信性能,8 B延迟为9μs,最大带宽为119 M B/s。对比数据表明V IA在IA-64平台上可以展示出更好的性能。展开更多
基金supported by the National Natural Science Foundation of China(11574174,11774193,11790311,11404183,11474030,21573121 and 51421002)the National Basic Research Program of China(2015CB921000)+1 种基金the President Foundation of China Academy of Engineering Physics(YZJJLX2016010)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB07030200)
文摘Interface enhanced superconductivity over 50 K has been discovered in monolayer Fe Se films grown on several TiO_2-terminated oxide substrates.Whether such phenomenon exists in other oxide substrates remains an extremely interesting topic.Here we report enhanced superconductivity with an onset transition temperature of 18 K in monolayer Fe Se on Mg O(001) substrate by transport measurement.Scanning transmission electron microscopy investigation on the interface structure indicates that Fe Se films grow epitaxially on Mg O(001) and that overlayer Fe atoms diffuse into the top two layers of Mg O and substitute Mg atoms.Our density functional theory calculations reveal that this substitution promotes the charge transfer from the Mg O substrate to the Fe Se films,an essential process that also occurs in monolayer Fe Se on TiO_2-terminated oxides and contributes to the enhanced superconductivity therein.Our finding suggests that superconductivity enhancement in monolayer Fe Se films on oxides substrates is rather general as long as charge transfer is allowed at the interface,thus pointing out an explicit direction for searching for new high temperature superconductivity by interface engineering.
文摘VIA是用户级集群系统工业标准.深入研究了VIA的规范和协议,设计和实现了一种高性能的用户级网卡--XUNI(PCI-X based user lever network interface),达到高带宽、低延迟,系统具有良好的计算通信重叠性.该网卡可以用于集群系统,也非常适用于高速网络存储系统.
文摘Y2000-62527-3 0103997路由选择和交换(含6篇论文)=Routing and switching[会,英]//Proceedings of 14th International Parallel &Distributed Processing Symposium.—3～52(HC)本部分6篇论文的内容有:多媒体路由仪的交换调度,高性能多用户系统区域网接口卡的微结构,电路交换模型中超立方广播,极多网络中路由选择性能改进,IBM SP 交换互联 NT 集群的有效虚拟接口结构支持,在似 RS/6000 SP 的双向多级互联网络中的自适应路由选择。
文摘针对IA-64平台地址空间和数据空间的特点,该文给出一种简单有效的地址转换与数据表示方法,在此基础上提出可以有效保持虚拟接口结构(v irtua l in terfacearch itecture,V IA)各层抽象描述与具体实现相一致的设计方案。在自主研制的V IA通信硬件基础上,实现了一个软硬件有机结合的实例THV IA 64。测试结果表明THV IA 64不仅可以稳定运行,而且具有很高的通信性能,8 B延迟为9μs,最大带宽为119 M B/s。对比数据表明V IA在IA-64平台上可以展示出更好的性能。
