Results 121 to 130 of about 1,301,436 (336)

A theory on perturbations of the Dirac operator

Journal of Inequalities and Applications, 1999
We consider perturbations of a first-order differential operator with matrix coefficients known as the Dirac operator. These operators have one singular point which is allowed to be either zero or infinity.
Melescue Suzanne Collier
doaj  

Yukawa-Lorentz symmetry of interacting non-Hermitian birefringent Dirac fermions

SciPost Physics
The energy spectra of linearly dispersing gapless spin-3/2 Dirac fermions display birefringence, featuring two effective Fermi velocities, thus breaking the space-time Lorentz symmetry.
Sk Asrap Murshed, Bitan Roy
doaj   +1 more source

Dirac Operators in Gauge Theory [PDF]

, 2015
This paper is a mixture of expository material and current research material. Among new results are examples of generalised harmonic spinors and their gauged version, the generalised Seiberg-Witten equations.
Haydys, Andriy, Kauffman, Louis H., Manturov, V. O.   +2 more
openaire   +2 more sources

Microscopic Insights into Magnetic Warping and Time‐Reversal Symmetry Breaking in Topological Surface States of Rare‐Earth‐Doped Bi2Te3

Advanced Materials, EarlyView.
Magnetic doping of the topological insulator Bi2Te3 with erbium adatoms induces out‐of‐plane magnetism and breaks time‐reversal symmetry, opening a Dirac gap and driving a Fermi surface transition from hexagonal to star‐of‐David geometry. Microscopy, spectroscopy, and magnetic dichroism reveal atomically controlled magnetic interactions that tailor the
Beatriz Muñiz Cano, Fabián Calleja, Ji Dai, Massimo Tallarida, Vera Marinova, Alessandro Barla, Marc G. Cuxart, Pierluigi Gargiani, Gonzalo N. Molina, José Angel Silva‐Guillén, Adriana I. Figueroa, Kevin García‐Díez, Sergio O. Valenzuela, Aitor Mugarza, Amadeo L. Vázquez de Parga, Rodolfo Miranda, Francisco Guinea, Manuela Garnica, Miguel A. Valbuena   +18 more
wiley   +1 more source

Generalised Dirac-Schrödinger operators and the Callias Theorem

Forum of Mathematics, Sigma
We consider generalised Dirac-Schrödinger operators, consisting of a self-adjoint elliptic first-order differential operator $\mathcal {D}$ with a skew-adjoint ‘potential’ given by a (suitable) family of unbounded operators.
Koen van den Dungen
doaj   +1 more source

Semiclassical limits for the QCD Dirac operator

, 2005
We identify three semiclassical parameters in the QCD Dirac operator. Mutual coupling of the different types of degrees of freedom (translational, colour and spin) depends on how the semiclassical limit is taken.
Amann, Banks, Bargman, Berbenni-Bitsch, Berry, Berry, Berry, Bolte, Bolte, Bolte, Bolte, Bolte, Bolte, Boya, Frisk, Gnutzmann, Gnutzmann, Gnutzmann, Guhr, Guhr, Guhr, Gutzwiller, Haake, Hannay, Janik, Keppeler, Kirillov, Littlejohn, Meinrenken, Montgomery, Osborn, Paul, Pletyukhov, Pletyukhov, Shuryak, Shushpanov, Smilga, Stefan Keppeler, Thomas, Thomas Guhr, Verbaarschot, Verbaarschot, Wong, Zyablyuk, ’t Hooft   +44 more
core   +2 more sources

Resolving the Structural Duality of Graphene Grain Boundaries

Advanced Materials, EarlyView.
Cantilever ncAFM resolves the atomic structure of grain boundaries in graphene, revealing coexisting stable and metastable types. Both contain pentagon/heptagon defects, but metastable GBs show irregular geometries. Modeling shows metastable GBs form under compression, exhibiting vertical corrugation, while stable GBs are flat.
Haojie Guo, Emiliano Ventura‐Macías, Mariano D. Jiménez‐Sánchez, Nicoleta Nicoara, Pierre Mallet, Jean‐Yves Veuillen, Vincent T. Renard, Antonio J. Martínez‐Galera, Pablo Pou, Julio Gómez‐Herrero, Rubén Pérez, Iván Brihuega   +11 more
wiley   +1 more source

On Huygens' principle for Dirac operators associated to electromagnetic fields

Anais da Academia Brasileira de Ciências, 2001
We study the behavior of massless Dirac particles, i.e., solutions of the Dirac equation with m = 0 in the presence of an electromagnetic field. Our main result (Theorem 1) is that for purely real or imaginary fields any Huygens type (in Hadamard's sense)
CHALUB FABIO A.C.C.
doaj  

Minimally doubled fermions and spontaneous chiral symmetry breaking

EPJ Web of Conferences, 2018
Chiral symmetry breaking in massless QCD is a very important feature in the current understanding of low energy physics. Low - lying Dirac modes are suitable to help us understand the spontaneous chiral symmetry breaking, since the formation of a non ...
Osmanaj (Zeqirllari) Rudina, Hyka (Xhako) Dafina   +1 more
doaj   +1 more source