Results 41 to 50 of about 17,657 (203)

Berry phases and zero-modes in toroidal topological insulator

, 2016
An effective Hamiltonian describing the surface states of a toroidal topological insulator is obtained, and it is shown to support both bound-states and charged zero-modes.
Carvalho-Santos, V. L., Fonseca, J. M., Moura-Melo, W. A., Pereira, A. R.   +3 more
core   +2 more sources

Symmetry Enhanced Unconventional Spin Current Anisotropy in a Collinear Antiferromagnet

Advanced Functional Materials, EarlyView.
Spin‐orbit torques (SOTs) are investigated in epitaxial FeSn, a topological antiferromagnet with kagome lattice symmetry. Combining experimental and theoretical approaches, the study identifies a six‐fold conventional damping‐like spin‐orbit torque (DL SOT), along with the coexistence of both six‐fold and uniaxial unconventional field‐like torque (FL ...
Pankhuri Gupta, Kacho Imtiyaz Ali Khan, Akash Kumar, Pratik Sahu, Rekha Agarwal, Artem Litvinenko, Nidhi Kandwal, Ram Singh Yadav, Birabar Ranjit Kumar Nanda, Johan Åkerman, Pranaba Kishor Muduli   +10 more
wiley   +1 more source

Moyal products -- a new perspective on quasi-hermitian quantum mechanics

, 2006
The rationale for introducing non-hermitian Hamiltonians and other observables is reviewed and open issues identified. We present a new approach based on Moyal products to compute the metric for quasi-hermitian systems.
Barrett B R, Bender C M, Bender C M, Berry M V, Bratteli O, Dobaczewski J, F G Scholtz, Geyer H B Scholtz F G, H B Geyer, Heiss W D, Jones H F, Kato T, Mostafazadeh A, Mostafazadeh A, Moyal J E, Schucan T H, Shapere A   +16 more
core   +1 more source

Majorana bound state of a Bogoliubov-de Gennes-Dirac Hamiltonian in arbitrary dimensions [PDF]

, 2011
We study a Majorana zero-energy state bound to a hedgehog-like point defect in a topological superconductor described by a Bogoliubov-de Gennes (BdG)-Dirac type effective Hamiltonian. We first give an explicit wave function of a Majorana state by solving
Fujiwara, Takanori, Fukui, Takahiro, Imura, Ken-Ichiro   +2 more
core   +2 more sources

Fast‐Responding O2 Gas Sensor Based on Luminescent Europium Metal‐Organic Frameworks (MOF‐76)

Advanced Functional Materials, EarlyView.
Luminescent MOF‐76 materials based on Eu(III) and mixed Eu(III)/Y(III) show rapid and reversible changes in emission intensity in response to O2 with very short response times. The effect is based on triplet quenching of the linker ligands that act as photosensitizers. Average emission lifetimes of a few milliseconds turn out to be mostly unaffected by
Zhenyu Zhao, Christian Weinberger, Jakob Steube, Matthias Bauer, Martin Brehm, Michael Tiemann   +5 more
wiley   +1 more source

Emerging topological multiferroics from the 2D Rice-Mele model

npj 2D Materials and Applications
We introduce a two-dimensional dimerized lattice model that reveals a remarkable feature: the emergence of a complex, non-trivial topological multiferroic phase marked by zero Berry curvature and a significant Berry connection that influences the model’s
Patricio Vergara, Guidobeth Sáez, Mario Castro, Sebastián Allende, Álvaro S. Núñez   +4 more
doaj   +1 more source

Monopole and Berry Phase in Momentum Space in Noncommutative Quantum Mechanics

, 2004
To build genuine generators of the rotations group in noncommutative quantum mechanics, we show that it is necessary to extend the noncommutative parameter $\theta $ to a field operator, which one proves to be only momentum dependent.
A. Bérard, A. Bérard, A. Das, A. Konechny, A.A Deriglazov, Alain Bérard, C. Duval, D.J. Thouless, G. Dunne, H. Poincaré, H. Snyder, Hervé Mohrbach, J. Belissard, J. Gamboa, J. Romero, J.E. Moyal, M. Chaichan, M. Onoda, M. Sheikh-Jabbari, M.V. Berry, N. Seiberg, P. Horvathy, P.A.M. Dirac, R. Jackiw, S. Ghosh, S.M. Carroll, V.P. Nair, Z. Fang   +27 more
core   +1 more source

Direct Evidence of Topological Dirac Fermions in a Low Carrier Density Correlated 5d Oxide

Advanced Functional Materials, EarlyView.
The 5d oxide BiRe2O6 is discovered as a low‐carrier‐density topological semimetal hosting symmetry‐protected Dirac fermions stabilized by nonsymmorphic symmetries. Angle‐resolved photoemission spectroscopy, quantum oscillations, and magnetotransport measurements reveal gapless Dirac cones, quasi‐2D Fermi surfaces, high carrier mobility, and a field ...
Premakumar Yanda, Jorge Cardenas‐Gamboa, Ding Pei, François Bertran, Leila Noohinejad, Snehashish Chatterjee, Changjiang Yi, Iñigo Robredo, Horst Borrmann, Maia G. Vergniory, Chandra Shekhar, Claudia Felser   +11 more
wiley   +1 more source

Topological nature of nonlinear optical effects in solids

, 2016
There are a variety of nonlinear optical effects including higher harmonic generations, photovoltaic effects, and nonlinear Kerr rotations. They are realized by the strong light irradiation to materials that results in nonlinear polarizations in the ...
Morimoto, Takahiro, Nagaosa, Naoto
core   +1 more source

Fermi Surface Nesting and Anomalous Hall Effect in Magnetically Frustrated Mn2PdIn

Advanced Functional Materials, EarlyView.
Mn2PdIn, a frustrated inverse Heusler alloy, showing electronic‐structure driven anomalous Hall effect with Weyl crossings, Fermi‐surface nesting and near‐zero magnetization ideal for low‐magnetization spintronics. Abstract Noncollinear magnets with near‐zero net magnetization and nontrivial bulk electronic topology hold significant promise for ...
Afsar Ahmed, Arnab Bhattacharya, Prashant Singh, Ajay Kumar, Tukai Singha, Anis Biswas, Yaroslav Mudryk, I. Das   +7 more
wiley   +1 more source