一、美国粮食管理署的构成和职能
一战爆发后，法国北部和比利时德国占领区的人民开始遭到饥荒的威胁。当时，赫伯特·克拉克·胡佛（Herbert Clark Hoover）作为一名独立的采矿顾问。正在伦敦帮助考察。然而，面对欧洲的战争...一、美国粮食管理署的构成和职能
一战爆发后，法国北部和比利时德国占领区的人民开始遭到饥荒的威胁。当时，赫伯特·克拉克·胡佛（Herbert Clark Hoover）作为一名独立的采矿顾问。正在伦敦帮助考察。然而，面对欧洲的战争和饥荒，胡佛立即参与了比利时救济委员会的工作，展开救济行动，五百多名义务工作者在他的领导下负责分发食物、衣服、船票和现金。展开更多
Based on first-principles calculations and symmetry arguments,we reveal that the non-centrosymmetric ternary tetradymite BiSbTe_(3) possesses exotic dual topological features of Weyl semimetallic phases with Z_(2) ind...Based on first-principles calculations and symmetry arguments,we reveal that the non-centrosymmetric ternary tetradymite BiSbTe_(3) possesses exotic dual topological features of Weyl semimetallic phases with Z_(2) index(1:000).The results show that the helical Dirac-type surface states protected by the time-reversal symmetry are present in the vicinity of the Brillouin zone center,which is consistent with the experimental report.Furthermore,we show that four pairs of Weyl points reside exactly at the Fermi level,which are guaranteed to be located on high-symmetry planes due to mirror symmetries.The helical surface states and the projected Weyl nodes are well separated in the momentum space,facilitating their observations in experiments.This work not only uncovers a unique quantum phenomenon with dual topological features in the tetradymite family but also paves a fascinating avenue for exploring the coexistence of multi-topological states with wide applications.展开更多
文摘一、美国粮食管理署的构成和职能
一战爆发后，法国北部和比利时德国占领区的人民开始遭到饥荒的威胁。当时，赫伯特·克拉克·胡佛（Herbert Clark Hoover）作为一名独立的采矿顾问。正在伦敦帮助考察。然而，面对欧洲的战争和饥荒，胡佛立即参与了比利时救济委员会的工作，展开救济行动，五百多名义务工作者在他的领导下负责分发食物、衣服、船票和现金。
基金Supported by the National Natural Science Foundation of China(Grant Nos.11604032,11674040,and 51672270)the Fundamental Research Funds for the Central Universities(Grant No.106112016CDJZR308808).
文摘Based on first-principles calculations and symmetry arguments,we reveal that the non-centrosymmetric ternary tetradymite BiSbTe_(3) possesses exotic dual topological features of Weyl semimetallic phases with Z_(2) index(1:000).The results show that the helical Dirac-type surface states protected by the time-reversal symmetry are present in the vicinity of the Brillouin zone center,which is consistent with the experimental report.Furthermore,we show that four pairs of Weyl points reside exactly at the Fermi level,which are guaranteed to be located on high-symmetry planes due to mirror symmetries.The helical surface states and the projected Weyl nodes are well separated in the momentum space,facilitating their observations in experiments.This work not only uncovers a unique quantum phenomenon with dual topological features in the tetradymite family but also paves a fascinating avenue for exploring the coexistence of multi-topological states with wide applications.
