scholarly journals Competing magnetic orders and multipolar Weyl fermions in 227 pyrochlore iridates

2021 ◽  
Vol 103 (24) ◽  
Author(s):  
Konstantinos Ladovrechis ◽  
Tobias Meng ◽  
Bitan Roy
Keyword(s):  
Magnetic Orders ◽  
Weyl Fermions

Non-collinear magnetism & multiferroicity: the perovskite case

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Eric Bousquet ◽  
Andrés Cano
Keyword(s):  
Reference Materials ◽  
Perovskite Oxides ◽  
Direct Application ◽  
Spin Hamiltonian ◽  
Multiferroic Properties ◽  
Magnetic Orders

AbstractThe most important types of non-collinear magnetic orders that are realized in simple perovskite oxides are outlined in relation to multiferroicity. These orders are classified and rationalized in terms of a mimimal spin Hamiltonian, based on which the notion of spin-driven ferroelectricity is illustrated. These concepts find direct application in reference materials such as BiFeO3, GdFeO3and TbMnO3whose multiferroic properties are briefly reviewed.

scholarly journals Anomalous transport due to Weyl fermions in the chiral antiferromagnets Mn3X, X = Sn, Ge

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Taishi Chen ◽  
Takahiro Tomita ◽  
Susumu Minami ◽  
Mingxuan Fu ◽  
Takashi Koretsune ◽  
...  
Keyword(s):  
Technological Innovation ◽  
Essential Role ◽  
Condensed Matter ◽  
Zero Field ◽  
Theoretical Studies ◽  
Planar Hall Effect ◽  
Topological States ◽  
Experimental And Theoretical Studies ◽  
Weyl Fermions

AbstractThe recent discoveries of strikingly large zero-field Hall and Nernst effects in antiferromagnets Mn3X (X = Sn, Ge) have brought the study of magnetic topological states to the forefront of condensed matter research and technological innovation. These effects are considered fingerprints of Weyl nodes residing near the Fermi energy, promoting Mn3X (X = Sn, Ge) as a fascinating platform to explore the elusive magnetic Weyl fermions. In this review, we provide recent updates on the insights drawn from experimental and theoretical studies of Mn3X (X = Sn, Ge) by combining previous reports with our new, comprehensive set of transport measurements of high-quality Mn3Sn and Mn3Ge single crystals. In particular, we report magnetotransport signatures specific to chiral anomalies in Mn3Ge and planar Hall effect in Mn3Sn, which have not yet been found in earlier studies. The results summarized here indicate the essential role of magnetic Weyl fermions in producing the large transverse responses in the absence of magnetization.

scholarly journals Nonlocal annihilation of Weyl fermions in correlated systems

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
L. Crippa ◽  
A. Amaricci ◽  
N. Wagner ◽  
G. Sangiovanni ◽  
J. C. Budich ◽  
...  
Keyword(s):  
Correlated Systems ◽  
Weyl Fermions

Multiple Weyl fermions and tunable quantum anomalous Hall effect in 2D half-metal with huge spin-related energy gap

2021 ◽  
Vol 551 ◽  
pp. 149390
Author(s):  
Weizhen Meng ◽  
Xiaoming Zhang ◽  
Weiwang Yu ◽  
Ying Liu ◽  
Lu Tian ◽  
...  
Keyword(s):  
Hall Effect ◽  
Energy Gap ◽  
Anomalous Hall Effect ◽  
Half Metal ◽  
Related Energy ◽  
Quantum Anomalous Hall Effect ◽  
Weyl Fermions

scholarly journals Magnetic dynamics with Weyl fermions

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Yaroslav Tserkovnyak
Keyword(s):  
Magnetic Dynamics ◽  
Weyl Fermions

scholarly journals MnNBr Monolayer: A High‐Temperature Ferromagnetic Half‐Metal with Type‐II Weyl Fermions

2021 ◽  
Vol 15 (7) ◽  
pp. 2170027
Author(s):  
Yongting Shi ◽  
Lingjun Li ◽  
Xin Cui ◽  
Tielei Song ◽  
Zhifeng Liu
Keyword(s):  
High Temperature ◽  
Type Ii ◽  
Half Metal ◽  
Weyl Fermions

scholarly journals Possible Weyl fermions in the magnetic Kondo system CeSb

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Chunyu Guo ◽  
Chao Cao ◽  
Michael Smidman ◽  
Fan Wu ◽  
Yongjun Zhang ◽  
...  
Keyword(s):  
Kondo System ◽  
Weyl Fermions

scholarly journals Symmetry-enriched quantum spin liquids in (3 + 1)d

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Po-Shen Hsin ◽  
Alex Turzillo
Keyword(s):  
Gauge Theory ◽  
Gauge Field ◽  
Quantum Spin ◽  
Global Symmetry ◽  
Spin Liquids ◽  
Systematic Method ◽  
Bosonic Field ◽  
Quantum Phases ◽  
Symmetry Protected ◽  
Weyl Fermions

Abstract We use the intrinsic one-form and two-form global symmetries of (3+1)d bosonic field theories to classify quantum phases enriched by ordinary (0-form) global symmetry. Different symmetry-enriched phases correspond to different ways of coupling the theory to the background gauge field of the ordinary symmetry. The input of the classification is the higher-form symmetries and a permutation action of the 0-form symmetry on the lines and surfaces of the theory. From these data we classify the couplings to the background gauge field by the 0-form symmetry defects constructed from the higher-form symmetry defects. For trivial two-form symmetry the classification coincides with the classification for symmetry fractionalizations in (2 + 1)d. We also provide a systematic method to obtain the symmetry protected topological phases that can be absorbed by the coupling, and we give the relative ’t Hooft anomaly for different couplings. We discuss several examples including the gapless pure U(1) gauge theory and the gapped Abelian finite group gauge theory. As an application, we discover a tension with a conjectured duality in (3 + 1)d for SU(2) gauge theory with two adjoint Weyl fermions.

Electronic Structure Transformation in a Magnetized Topological Semimetal

2021 ◽  
Vol 1 ◽  
Keyword(s):  
Electronic Structure ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Localized States ◽  
Structure Transformation ◽  
Nodal Lines ◽  
Topological Semimetal ◽  
Magnetic Domain Walls ◽  
Magnetic Orders ◽  
Topological Semimetals

We theoretically show that the nodal structures in topological semimetals, including Weyl points and nodal lines, can be switched by magnetic orders, accompanied by localized states at magnetic domain walls.

Sign in / Sign up

Export Citation Format

Share Document