Results 31 to 40 of about 5,377,924 (61)
Topological Band Theory for Non-Hermitian Hamiltonians. [PDF]
Physical Review Letters, 2017 We develop the topological band theory for systems described by non-Hermitian Hamiltonians, whose energy spectra are generally complex. After generalizing the notion of gapped band structures to the non-Hermitian case, we classify "gapped" bands in one ...
Huitao Shen, B. Zhen, L. Fu
semanticscholar +1 more source
, 2018 A discrete non-linear $\sigma$-model is obtained by triangulate both the space-time $M^{d+1}$ and the target space $K$. If the path integral is given by the sum of all the complex homomorphisms $\phi: M^{d+1} \to K$, with an partition function that is ...
Lan, Tian +2 more
core +1 more source
On order-bounded subsets of locally solid Riesz spaces
, 2015 In a topological Riesz space there are two types of bounded subsets: order bounded subsets and topologically bounded subsets. It is natural to ask (1) whether an order bounded subset is topologically bounded and (2) whether a topologically bounded subset
Hong, Liang
core +1 more source
Comprehensive search for topological materials using symmetry indicators [PDF]
Nature, 2018 Over the past decade, topological materials—in which the topology of electron bands in the bulk material leads to robust, unconventional surface states and electromagnetism—have attracted much attention.
F. Tang, H. Po, A. Vishwanath, X. Wan
semanticscholar +1 more source
Topological Signal Processing Over Simplicial Complexes [PDF]
IEEE Transactions on Signal Processing, 2019 The goal of this paper is to establish the fundamental tools to analyze signals defined over a topological space, i.e. a set of points along with a set of neighborhood relations.
S. Barbarossa, S. Sardellitti
semanticscholar +1 more source
Observation of topological valley transport of sound in sonic crystals [PDF]
Nature Physics, 2016 Valleytronics — exploiting a system’s pseudospin degree of freedom — is being increasingly explored in sonic crystals. Now, valley transport of sound is reported for a macroscopic triangular-lattice array of rod-like scatterers in a 2D air waveguide. The
Jiuyang Lu +6 more
semanticscholar +1 more source
Momentum-space imaging of Cooper pairing in a half-Dirac-gas topological superconductor [PDF]
Nature Physics, 2014 Superconductivity involving topological Dirac electrons has recently been proposed as a platform between concepts in high-energy and condensed-matter physics. It has been predicted that supersymmetry and Majorana fermions, both of which remain elusive in
Su-Yang Xu +16 more
semanticscholar +1 more source
All-Si valley-Hall photonic topological insulator [PDF]
Conference on Lasers and Electro-Optics, 2016 An all-Si photonic structure emulating the quantum-valley-Hall effect is proposed. We show that it acts as a photonic topological insulator (PTI), and that an interface between two such PTIs can support edge states that are free from scattering.
Tzuhsuan Ma, G. Shvets
semanticscholar +1 more source
Topological nodal-line fermions in spin-orbit metal PbTaSe2
Nature Communications, 2016 Topological semimetals can support one-dimensional Fermi lines or zero-dimensional Weyl points in momentum space, where the valence and conduction bands touch.
G. Bian +23 more
semanticscholar +1 more source
Soft topological space and topology on the Cartesian product
, 2016 Matejdes Milan
semanticscholar +1 more source