以前谈到过物联网（Internet of Things）和物连网（Networks of Things）的区别，目前的许多物联网应用其实大部分都是以“物连网”的形态存在，这是由“物”的“所有权”性质决定的。例如公安系统的消防和安防物联网主要存在于内网（I...以前谈到过物联网（Internet of Things）和物连网（Networks of Things）的区别，目前的许多物联网应用其实大部分都是以“物连网”的形态存在，这是由“物”的“所有权”性质决定的。例如公安系统的消防和安防物联网主要存在于内网（Intranet）和专网（Extranet）中，展开更多
In 1929,Weyl H.proposed that the massless solution of the Dirac equation represents a pair of a new type of particles,the so-called Weyl fermions[1].However,their existence as a fundamental particle remains evasive af...In 1929,Weyl H.proposed that the massless solution of the Dirac equation represents a pair of a new type of particles,the so-called Weyl fermions[1].However,their existence as a fundamental particle remains evasive after more than eight decades.Neutrinos were once considered to be Weyl fermions until its mass was found.Recently,it was proposed that Weyl fermions can be hosted in a class of exotic condensed matter,so called Weyl semimetal(WSM),展开更多
In this study, we used the crystal structure search method and first-principles calculations to systematically explore the highpressure phase diagrams of the TaAs family(NbP, NbAs, TaP, and TaAs). Our calculation resu...In this study, we used the crystal structure search method and first-principles calculations to systematically explore the highpressure phase diagrams of the TaAs family(NbP, NbAs, TaP, and TaAs). Our calculation results show that NbAs and TaAs have similar phase diagrams, the same structural phase transition sequence I4_1 md→P6 m2→P2_1/c→Pm3 m, and slightly different transition pressures. The phase transition sequence of NbP and TaP differs somewhat from that of NbAs and TaAs, in which new structures emerge, such as the Cmcm structure in NbP and the Pmmn structure in TaP. Interestingly, we found that in the electronic structure of the high-pressure phase P6 m2-NbAs, there are coexistingWeyl points and triple degenerate points, similar to those found in high-pressure P6 m2-TaAs.展开更多
文摘以前谈到过物联网（Internet of Things）和物连网（Networks of Things）的区别，目前的许多物联网应用其实大部分都是以“物连网”的形态存在，这是由“物”的“所有权”性质决定的。例如公安系统的消防和安防物联网主要存在于内网（Intranet）和专网（Extranet）中，
文摘In 1929,Weyl H.proposed that the massless solution of the Dirac equation represents a pair of a new type of particles,the so-called Weyl fermions[1].However,their existence as a fundamental particle remains evasive after more than eight decades.Neutrinos were once considered to be Weyl fermions until its mass was found.Recently,it was proposed that Weyl fermions can be hosted in a class of exotic condensed matter,so called Weyl semimetal(WSM),
基金supported by the National Key R&D Program of China(Grant No.2016YFA0300404)the National Key Projects for Basic Research in China(Grant No.2015CB921202)+4 种基金the National Natural Science Foundation of China(Grant Nos.11574133,and 51372112)the Natural Science Foundation Jiangsu Province(Grant No.BK20150012)the Science Challenge Project(Grant No.TZ2016001)the Fundamental Research Funds for the Central UniversitiesSpecial Program for Applied Research on Super Computation of the National Natural Science FoundationGuangdong Joint Fund
文摘In this study, we used the crystal structure search method and first-principles calculations to systematically explore the highpressure phase diagrams of the TaAs family(NbP, NbAs, TaP, and TaAs). Our calculation results show that NbAs and TaAs have similar phase diagrams, the same structural phase transition sequence I4_1 md→P6 m2→P2_1/c→Pm3 m, and slightly different transition pressures. The phase transition sequence of NbP and TaP differs somewhat from that of NbAs and TaAs, in which new structures emerge, such as the Cmcm structure in NbP and the Pmmn structure in TaP. Interestingly, we found that in the electronic structure of the high-pressure phase P6 m2-NbAs, there are coexistingWeyl points and triple degenerate points, similar to those found in high-pressure P6 m2-TaAs.
