Results 41 to 50 of about 259,006 (285)
Crystals, 2021 A single-component molecular crystal [Pd(dddt)2] has been shown to exhibit almost temperature-independent resistivity under high pressure, leading theoretical studies to propose it as a three-dimensional (3D) Dirac electron system.
Hengbo Cui +5 more
doaj +1 more source
Observation of a Dirac nodal line in AlB2 [PDF]
, 2018 We have performed angle-resolved photoemission spectroscopy of AlB2 which is isostructural to high-temperature superconductor MgB2. Using soft-x-ray photons, we accurately determined the three-dimensional bulk band structure and found a highly ...
Hori, Kentaro +10 more
core +3 more sources
Formal deformations of Dirac structures
Journal of Geometry and Physics, 2007 LaTeX 2e, 26 pages, no figures.
Keller, Frank, Waldmann, Stefan
openaire +2 more sources
Reduction of Stokes-Dirac structures and gauge symmetry in port-Hamiltonian systems
, 2012 Stokes-Dirac structures are infinite-dimensional Dirac structures defined in terms of differential forms on a smooth manifold with boundary. These Dirac structures lay down a geometric framework for the formulation of Hamiltonian systems with a nonzero ...
Scherpen, Jacquelien M. A. +2 more
core +1 more source
DIRAC STRUCTURES FROM LIE INTEGRABILITY [PDF]
International Journal of Geometric Methods in Modern Physics, 2012 We prove that a pair (F = vector sub-bundle of TM, its annihilator) yields an almost Dirac structure which is Dirac if and only if F is Lie integrable. Then a flat Ehresmann connection on a fiber bundle ξ yields two complementary, but not orthogonally, Dirac structures on the total space M of ξ.
openaire +1 more source
Complex Kerr Geometry, Twistors and the Dirac Electron
, 2008 The Kerr-Newman spinning particle displays some remarkable relations to the Dirac electron and has a reach spinor structure which is based on a twistorial description of the Kerr congruence determined by the Kerr theorem. We consider the relation between
A Burinskii +20 more
core +1 more source
Letters in Mathematical Physics, 2000 The Courant bracket defined originally on the sections of the vector bundle TM ⊕ T*M → M is extended to the direct sum of the 1-jet vector bundle and its dual. The extended bracket allows one to interpret many structures encountered in differential geometry in terms of Dirac structures. We give here a new approach to conformal Jacobi structures.
openaire +3 more sources
Dirac structures in vakonomic mechanics
Journal of Geometry and Physics, 2015 In this paper, we explore dynamics of the nonholonomic system called vakonomic mechanics in the context of Lagrange-Dirac dynamical systems using a Dirac structure and its associated Hamilton-Pontryagin variational principle. We first show the link between vakonomic mechanics and nonholonomic mechanics from the viewpoints of Dirac structures as well as
Jiménez, Fernando, Yoshimura, Hiroaki
openaire +3 more sources
Indagationes Mathematicae, 2014 A Dirac structure is a Lagrangian subbundle of a Courant algebroid, $L\subset\mathbb{E}$, which is involutive with respect to the Courant bracket. In particular, $L$ inherits the structure of a Lie algebroid. In this paper, we introduce the more general notion of a pseudo-Dirac structure: an arbitrary subbundle, $W\subset\mathbb{E}$, together with a ...
openaire +3 more sources
A new form of Ca3P2 with a ring of Dirac nodes
APL Materials, 2015 We report the synthesis and crystal structure of a new high-temperature form of Ca3P2. The crystal structure was determined through Rietveld refinements of synchrotron powder x-ray diffraction data.
Lilia S. Xie +5 more
doaj +1 more source