scholarly journals First-principles calculations on the spin anomalous Hall effect of ferromagnetic alloys

2021 ◽  
Vol 5 (10) ◽  
Author(s):  
Yoshio Miura ◽  
Keisuke Masuda
Keyword(s):  
Hall Effect ◽  
First Principles ◽  
Anomalous Hall Effect ◽  
First Principles Calculations ◽  
Ferromagnetic Alloys

scholarly journals Interface-induced sign reversal of the anomalous Hall effect in magnetic topological insulator heterostructures

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Fei Wang ◽  
Xuepeng Wang ◽  
Yi-Fan Zhao ◽  
Di Xiao ◽  
Ling-Jie Zhou ◽  
...  
Keyword(s):  
Hall Effect ◽  
Electric Fields ◽  
First Principles ◽  
Berry Phase ◽  
Condensed Matter ◽  
Anomalous Hall Effect ◽  
First Principles Calculations ◽  
Sign Reversal ◽  
Berry Curvature ◽  
Topological Materials

AbstractThe Berry phase picture provides important insights into the electronic properties of condensed matter systems. The intrinsic anomalous Hall (AH) effect can be understood as the consequence of non-zero Berry curvature in momentum space. Here, we fabricate TI/magnetic TI heterostructures and find that the sign of the AH effect in the magnetic TI layer can be changed from being positive to negative with increasing the thickness of the top TI layer. Our first-principles calculations show that the built-in electric fields at the TI/magnetic TI interface influence the band structure of the magnetic TI layer, and thus lead to a reconstruction of the Berry curvature in the heterostructure samples. Based on the interface-induced AH effect with a negative sign in TI/V-doped TI bilayer structures, we create an artificial “topological Hall effect”-like feature in the Hall trace of the V-doped TI/TI/Cr-doped TI sandwich heterostructures. Our study provides a new route to create the Berry curvature change in magnetic topological materials that may lead to potential technological applications.

scholarly journals Tailoring the anomalous Hall effect of SrRuO3 thin films by strain: A first principles study

2021 ◽  
Vol 129 (9) ◽  
pp. 093904
Author(s):  
Kartik Samanta ◽  
Marjana Ležaić ◽  
Stefan Blügel ◽  
Yuriy Mokrousov
Keyword(s):  
Thin Films ◽  
Hall Effect ◽  
First Principles ◽  
Anomalous Hall Effect ◽  
First Principles Study

Prediction of flatness-driven quantum spin Hall effect in functionalized germanene and stanene

2016 ◽  
Vol 18 (40) ◽  
pp. 28134-28139 ◽  
Author(s):  
Run-wu Zhang ◽  
Wei-xiao Ji ◽  
Chang-wen Zhang ◽  
Ping Li ◽  
Pei-ji Wang
Keyword(s):  
Hall Effect ◽  
First Principles ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
First Principles Calculations ◽  
Quantum Spin Hall Effect ◽  
Chemical Functionalization ◽  
Quantum Spin Hall

We used first-principles calculations to predict a class of new QSH phases for f-Ge(Sn)X2 films, which are useful for applications because of not only their sizable nontrivial bulk gaps, but also the tunability of the QSH states by chemical functionalization.

Evidence for Oxygen DX Centers in AlGaN

1998 ◽  
Vol 512 ◽  
Author(s):  
M. D. Mccluskey ◽  
N. M. Johnson ◽  
C. G. Van De Walle ◽  
D. P. Bour ◽  
M. Kneissl ◽  
...  
Keyword(s):  
Activation Energy ◽  
Hall Effect ◽  
First Principles ◽  
Aluminum Content ◽  
Threshold Energy ◽  
Persistent Photoconductivity ◽  
First Principles Calculations ◽  
Theoretical Predictions ◽  
Hall Effect Measurements ◽  
Theoretical Evidence

ABSTRACTExperimental and theoretical evidence is presented for oxygen DX centers in AlxGa1−xN. As the aluminum content increases, Hall effect measurements reveal an increase in the electron activation energy, consistent with the emergence of a deep DX level from the conduction band. Persistent photoconductivity is observed in Al0 39Ga0. 61N:O at temperatures below 150 K after exposure to light, with an optical threshold energy of 1.3 eV, in excellent agreement with first-principles calculations. Unlike oxygen, silicon does not exhibit DX-like behavior, in agreement with previous theoretical predictions.

Anomalous hall effect in disordered ferromagnetic alloys of the transition metals

1987 ◽  
Vol 30 (1) ◽  
pp. 49-60 ◽  
Author(s):  
A. V. Bedyaev ◽  
A. N. Voloshinskii ◽  
A. B. Granovskii ◽  
N. V. Ryzhanova
Keyword(s):  
Transition Metals ◽  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Ferromagnetic Alloys

First-principles study of bilayer hexagonal structure of SN2 nanosheet: a highly stable non-metal platform for the quantum anomalous Hall effect

2021 ◽  
Author(s):  
Yanli Wang ◽  
Yi Ding
Keyword(s):  
Transition Metal ◽  
Hall Effect ◽  
First Principles ◽  
Transition Metal Dichalcogenides ◽  
Anomalous Hall Effect ◽  
Hexagonal Structure ◽  
Two Dimensional ◽  
First Principles Study ◽  
Quantum Anomalous Hall Effect ◽  
Metal Dichalcogenides

Although layered metal dinitrides (MN2) have been proposed as the cousins of transition-metal dichalcogenides, the non-MoS2-type geometries are found to be more favourable in two-dimensional (2D) MN2 nanosheets. In this...

scholarly journals Coverage-dependent magnetic and electronic properties of graphene with Co adatoms

2021 ◽  
pp. 2150165
Author(s):  
Min Gao ◽  
Jun Hu
Keyword(s):  
Electronic Properties ◽  
First Principles ◽  
Dirac Point ◽  
2D Materials ◽  
Anomalous Hall Effect ◽  
Spin Moment ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Spin Polarized ◽  
Topological States

Decorating two-dimensional (2D) materials with transition-metal adatoms is an effective way to bring about new physical properties that are intriguing for applications in electronics and spintronics devices. Here, we systematically studied the coverage-dependent magnetic and electronic properties of graphene decorated by Co adatoms, based on first-principles calculations. We found that if the Co coverage is larger than 1/3[Formula: see text]ML, the Co atoms will aggregate to form a Co monolayer and then a van der Waals bilayer system between the Co monolayer and graphene forms. When the Co coverage is [Formula: see text][Formula: see text]ML, the Co adatom is spin-polarized with spin moment varying from 1.1 to 1.4[Formula: see text][Formula: see text]. The [Formula: see text] and [Formula: see text] orbitals of Co hybridize significantly with the [Formula: see text] bands of graphene, which generates a series of new bands in the energy range from [Formula: see text][Formula: see text]eV to 1[Formula: see text]eV with respect to the Dirac point of graphene. In most cases, the new bands near the Fermi level lead to topological states characterized by the quantum anomalous Hall effect.

Quantum spin Hall effect in two-dimensional hydrogenated SnPb alloy films

2018 ◽  
Vol 20 (14) ◽  
pp. 9610-9615
Author(s):  
Miaojuan Ren ◽  
Min Yuan ◽  
Xinlian Chen ◽  
Weixiao Ji ◽  
Ping Li ◽  
...  
Keyword(s):  
Hall Effect ◽  
First Principles ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Band Structures ◽  
Alloy Films ◽  
Quantum Spin Hall Effect ◽  
Quantum Spin Hall

Using first-principles calculations, we studied the geometric and band structures of 20 possible configurations of buckled hydrogenated SnPb alloy (SnxPb8−xH8) films.

On the sign of the anomalous hall effect in ferromagnetic alloys

1975 ◽  
Vol 55 (2) ◽  
pp. 118-120 ◽  
Author(s):  
J.W.F. Dorleijn ◽  
A.R. Miedema
Keyword(s):  
Hall Effect ◽  
Anomalous Hall Effect ◽  
Ferromagnetic Alloys
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