Exploring unconventional topological quasiparticles and their associated exotic physical properties has become a hot topic in condensed matter physics,thus stimulating extensive interest in recent years.Here,in contra...Exploring unconventional topological quasiparticles and their associated exotic physical properties has become a hot topic in condensed matter physics,thus stimulating extensive interest in recent years.Here,in contrast to the double-Weyl phonons(the topological chiral charge+2)in the trigonal and hexagonal crystal systems,we propose that the unconventional double-Weyl without counterparts in high-energy physics can emerge in the phonons of cubic structures,i.e.,SrSi_(2).展开更多
Realization of nontrivial band topology in condensed matter systems is of great interest in recent years.Using first-principles calculations and symmetry analysis,we propose an exotic topological phase with tunable fe...Realization of nontrivial band topology in condensed matter systems is of great interest in recent years.Using first-principles calculations and symmetry analysis,we propose an exotic topological phase with tunable ferromagnetic Weyl fermions in a halfmetallic oxide CrP_(2)O_(7).In the absence of spin–orbit coupling(SOC),we reveal that CrP_(2)O_(7) possesses a hybrid nodal ring.When SOC is present,the spin-rotation symmetry is broken.As a result,the hybrid nodal ring shrinks to discrete nodal points and forms different types of Weyl points.The Fermi arcs projected on the(100)surface are clearly visible,which can contribute to the experimental study for the topological properties of CrP_(2)O_(7).In addition,the calculated quasiparticle interference patterns are also highly desirable for the experimental study of CrP_(2)O_(7).Our findings provide a good candidate of ferromagnetic Weyl semimetals,and are expected to realize related topological applications with their attracted features.展开更多
基金This work is supported by the Guangdong Natural Science Funds for Distinguished Young Scholars(No.2017B030306008)the National Natural Science Foundation of China(Nos.11974160,11674148,and 11334003)+2 种基金the China Postdoctoral Science Foundation(No.2019M652686)the Natural Science Basic Research Plan in Shaanxi Province of China(No.2018JQ1083)the Center for Computational Science and Engineering of Southern University of Science and Technology.
文摘Exploring unconventional topological quasiparticles and their associated exotic physical properties has become a hot topic in condensed matter physics,thus stimulating extensive interest in recent years.Here,in contrast to the double-Weyl phonons(the topological chiral charge+2)in the trigonal and hexagonal crystal systems,we propose that the unconventional double-Weyl without counterparts in high-energy physics can emerge in the phonons of cubic structures,i.e.,SrSi_(2).
基金This work is supported by the National Natural Science Foundation of China(NSFC,Grant Nos.11674148,11334003,and 11847301)the Guangdong Natural Science Funds for Distinguished Young Scholars(No.2017B030306008)+5 种基金the Fundamental Research Funds for the Central Universities(Nos.cqu2018CDHB1B01,2019CDXYWL0029,and 2019CDJDWL0005)the China Postdoctoral Science Foundation(No.2019M652686)the Natural Science Basic Research plan in Shaanxi Province of China(Grant No.2018JQ1083)the Scientific Research Program Funded by Shaanxi Provincial Education Department(Grant No.17JK0041)the Baoji University of Arts and Sciences Key Research(Grant No.:ZK2017009)the Science,Technology,and Innovation Commission of Shenzhen Municipality(No.ZDSYS20170303165926217).
文摘Realization of nontrivial band topology in condensed matter systems is of great interest in recent years.Using first-principles calculations and symmetry analysis,we propose an exotic topological phase with tunable ferromagnetic Weyl fermions in a halfmetallic oxide CrP_(2)O_(7).In the absence of spin–orbit coupling(SOC),we reveal that CrP_(2)O_(7) possesses a hybrid nodal ring.When SOC is present,the spin-rotation symmetry is broken.As a result,the hybrid nodal ring shrinks to discrete nodal points and forms different types of Weyl points.The Fermi arcs projected on the(100)surface are clearly visible,which can contribute to the experimental study for the topological properties of CrP_(2)O_(7).In addition,the calculated quasiparticle interference patterns are also highly desirable for the experimental study of CrP_(2)O_(7).Our findings provide a good candidate of ferromagnetic Weyl semimetals,and are expected to realize related topological applications with their attracted features.