Results 101 to 110 of about 259,006 (285)

Designer gapped and tilted Dirac cones in lateral graphene superlattices

APL Quantum
We show that a planar array of bipolar waveguides in graphene can be used to engineer gapped and tilted two-dimensional Dirac cones within the electronic band structure.
A. Wild, R. R. Hartmann, E. Mariani, M. E. Portnoi   +3 more
doaj   +1 more source

Dirac Algebroids in Lagrangian and Hamiltonian Mechanics

, 2011
We present a unified approach to constrained implicit Lagrangian and Hamiltonian systems based on the introduced concept of Dirac algebroid. The latter is a certain almost Dirac structure associated with the Courant algebroid on the dual $E^\ast$ to a ...
Brown, Cendra, Cortés, Cortés, Cortés, Courant, Crainic, deLeón, Dirac, Dorfman, Grabowska, Grabowska, Grabowska, Grabowska, Grabowska, Grabowska, Grabowski, Grabowski, Grabowski, Grabowski, Grabowski, Iglesias, Iglesias, Janusz Grabowski, Katarzyna Grabowska, Konieczna, Kosmann-Schwarzbach, Libermann, Martínez, Martínez, Martínez, Pradines, Tulczyjew, Tulczyjew, Tulczyjew, Urbański, Weinstein, Yoshimura, Yoshimura   +38 more
core   +1 more source

Microwave Absorption for Detection of Dirac Fermions in SnTe Films

Advanced Materials Interfaces, EarlyView.
Microwave absorption can detect Dirac fermions in samples exposed to the atmosphere. Results showed that although topological surface states are robust against environmental degradation, they are not detectable by electrical transport measurements. Hence, microwave absorption can detect Dirac fermions even in samples whose surfaces have deteriorated ...
Wellington P. do Prado, Jorge A. Navarro‐Giraldo, Muhammad Tahsin, Vinicius T. Santana, Eduardo Abramof, Paulo H. O. Rappl, Suelen de Castro, Marcelos L. Peres, Petr Neugebauer   +8 more
wiley   +1 more source

High-entropy engineering of the crystal and electronic structures in a Dirac material

Nature Communications
Dirac and Weyl semimetals are a central topic of contemporary condensed matter physics, and the discovery of new compounds with Dirac/Weyl electronic states is crucial to the advancement of topological materials and quantum technologies.
Antu Laha, Suguru Yoshida, Francisco Marques dos Santos Vieira, Hemian Yi, Seng Huat Lee, Sai Venkata Gayathri Ayyagari, Yingdong Guan, Lujin Min, Jose Gonzalez Jimenez, Leixin Miao, David Graf, Saugata Sarker, Weiwei Xie, Nasim Alem, Venkatraman Gopalan, Cui-Zu Chang, Ismaila Dabo, Zhiqiang Mao   +17 more
doaj   +1 more source

Hidden symmetry and protection of Dirac points on the honeycomb lattice

, 2014
The honeycomb lattice possesses a novel energy band structure, which is characterized by two distinct Dirac points in the Brillouin zone, dominating most of the physical properties of the honeycomb structure materials. However, up till now, the origin of
Chen, Wei, Hou, Jing-Min
core   +1 more source

Nambu–Dirac Structures for Lie Algebroids

Letters in Mathematical Physics, 2002
minor ...
openaire   +2 more sources

Direct Photocurrent Detection of Optical Vortex Based on the Orbital Photo Galvanic Effect: Progress, Challenge, and Perspective

Advanced Science, EarlyView.
Direct orbital angular momentum (OAM) detection through the orbital photogalvanic effect offers a scalable route for integrated optoelectronics. This perspective evaluates symmetry‐driven material selection and demonstrates how electrode matrices enable the resolution of complex, mixed OAM modes.
Jinluo Cheng, Dehong Yang, Weiming Wang, Chang Xu, Zipu Fan, Dong Sun   +5 more
wiley   +1 more source

Lifshitz Transition in Correlated Topological Semimetals

Advanced Science, EarlyView.
Theoretical calculations reveal that in YPtBi and GdPtBi, strong electronic correlations shift topological Dirac nodes away from the Fermi level by forming large hole pockets. This effect is sensitive to temperature and arises from interactions among 4d or 4f electrons, offering insights into Fermi surface engineering in quantum materials.
Byungkyun Kang, Myoung‐Hwan Kim, Chul Hong Park, Anderson Janotti, Eunja Kim   +4 more
wiley   +1 more source

Random Time‐Space Coding Metasurfaces for Spatial Control of the Temporal Statistics of Electromagnetic Fields

Advanced Science, EarlyView.
A probabilistic framework based on random time‐space coding metasurfaces enables control of the spatial distribution of electromagnetic fields temporal statistics. By tailoring the marginal and joint distributions of random codes, electromagnetic fields with desired mean and variance patterns are realized, enabling simultaneous transmission and jamming.
Jia Cheng Li, Jiang Han Bao, Che Liu, Tie Jun Cui   +3 more
wiley   +1 more source

Quantum oscillations in the type-II Dirac semi-metal candidate PtSe2

New Journal of Physics, 2018
Three-dimensional topological semi-metals carry quasiparticle states that mimic massless relativistic Dirac fermions, elusive particles that have never been observed in nature.
Hao Yang, Marcus Schmidt, Vicky Süss, Mun Chan, Fedor F Balakirev, Ross D McDonald, Stuart S P Parkin, Claudia Felser, Binghai Yan, Philip J W Moll   +9 more
doaj   +1 more source