Topological Dirac nodal lines and surface charges in fcc alkaline earth metals
نویسندگان
چکیده
منابع مشابه
Topological Dirac nodal lines and surface charges in fcc alkaline earth metals
In nodal-line semimetals, the gaps close along loops in k space, which are not at high-symmetry points. Typical mechanisms for the emergence of nodal lines involve mirror symmetry and the π Berry phase. Here we show via ab initio calculations that fcc calcium (Ca), strontium (Sr) and ytterbium (Yb) have topological nodal lines with the π Berry phase near the Fermi level, when spin-orbit interac...
متن کاملTopological surface states in nodal superconductors.
Topological superconductors have become a subject of intense research due to their potential use for technical applications in device fabrication and quantum information. Besides fully gapped superconductors, unconventional superconductors with point or line nodes in their order parameter can also exhibit nontrivial topological characteristics. This article reviews recent progress in the theore...
متن کاملTri-Dirac Surface Modes in Topological Superconductors
Chen Fang, B. Andrei Bernevig and Matthew J. Gilbert Department of Physics, University of Illinois, Urbana IL 61801-3080 Micro and Nanotechnology Laboratory, University of Illinois, Urbana IL 61801 Department of Physics, Princeton University, Princeton NJ 08544 Department of Electrical and Computer Engineering, University of Illinois, Urbana IL 61801 and Department of Electronics Engineering, U...
متن کاملEmergence of topological nodal loops in alkaline-earth hexaborides XB6 (X = Ca, Sr, and Ba) under pressure.
Based on first-principles calculations, we report that external pressure can induce a topological phase transition in alkaline-earth hexaborides, XB6 (X = Ca, Sr, and Ba). It was revealed that XB6 are transformed from trivial semiconductors to topological node-line semimetals under moderate pressure when the spin-orbit coupling (SOC) is ignored. The band inversion between the B p-orbitals at th...
متن کاملGrain boundary and surface energies of fcc metals.
Interfacial energies of five high-angle singular grain boundaries ~GB’s! in seven fcc metals—Ag, Al, Au, Cu, Ni, Pd, and Pt—are calculated employing lattice statics at 0 K using embedded-atom-method potentials. The results disagree with predictions of broken-bond models. The GB energies, however, exhibit a good linear relationship with the c44 elastic constants of these elements. This implies t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature Communications
سال: 2017
ISSN: 2041-1723
DOI: 10.1038/ncomms14022