【摘 要】
：
Beryllium is a simple alkali earth metal,but has been the target of intensive studies for decades because of its unusual electron behaviors at surfaces.Puzzling aspects include(i)severe deviations fro
【机 构】
：
Shenyang National Laboratory for Materials Sciences,Institute of Metal Research,Chinese Academy of S
【出 处】
：
第13届中日双边先进能源系统和聚变裂变工程材料会议(CIS-13)
论文部分内容阅读
Beryllium is a simple alkali earth metal,but has been the target of intensive studies for decades because of its unusual electron behaviors at surfaces.Puzzling aspects include(i)severe deviations from the description of the nearly free electron picture,(ii)anomalously large electron-phonon coupling effect,and(iii)giant Friedal oscillations.The underlying origins for such anomalous surface electron behaviors have been under active debate,but with no consensus.Here,by means of first-principle calculations,we discover that this pure metal system,surprisingly,harbors the Dirac node line(DNL)that in turn helps to rationalize many of the existing puzzles.The DNL is featured by a closed line consisting of linear band crossings and its induced topological surface band agrees well with previous photoemission spectroscopy observation on Be(0001)surface.We further reveal that each of the elemental alkali earth metals of Mg,Ca,and Sr also harbors the DNL,and speculate that the fascinating topological property of DNL might naturally exist in other elemental metals as well.
其他文献
N36 zirconium ally was developed by NPIC as a fuel rod cladding and other component materials for the use in nuclear reactor cores.The lead test rods of N36 cladding which was fabricated using low-def
The first candidate material for fusion blanket is the reduced-activation ferritic/martensitic(RAFM)steels,such as F82H steel and JLF-1 steel.While,advanced materials,such as oxide-dispersion-strength
Oxide dispersion strengthened(ODS)steel attracts increasing attention as nuclear structural materials owing to its superior mechanical properties and high resistance to irradiation.Oxide/matrix interf
Dissimilar joining of oxide dispersion strengthened(ODS)steel and reduced activation ferritic/martensitic(RAFM)steel would be required for the construction of advanced reactors to increase the flexibl
Oxide dispersion strengthened(ODS)steel,because of its excellent anti-radiation performance and high temperature mechanical properties,is becoming the most promising structural materials of fusion rea
The developments of the high power neutron sources with liquid metal targets driven by proton accelerators are carried out to provide various applications including the transmutation of nuclear wastes
Beryllium(Be)is one of candidate materials for neutron multipliers for fusion reactors.However,some problems have been anticipated such as hydrogen generation reaction with vapor and volumetric swelli
As an enhanced accident tolerant fuel(ATF)for BWR at severe accident condition,FeCrAl-ODS ferritic steels have been developed,and their applicability is being studied under the Japanese MEXT program.A
Beryllium intermetallic compounds(beryllides)such as Be12Ti,Be12V,are the most promising advanced neutron multipliers in demonstration power reactors because of low swelling and high stability at high
Reduced activation ferritic/martensitic(RAFM)steels were highly recommended as the structure materials for tritium plasma and breeding blanket in the next generation of fusion reactors due to its bett