scholarly journals Spontaneous magnetization and Hall effect in superconductors with broken time-reversal symmetry

2002 ◽  
Vol 57 (6) ◽  
pp. 892-897 ◽  
Author(s):  
B Horovitz ◽  
A Golub
2020 ◽  
Vol 6 (23) ◽  
pp. eaaz8809 ◽  
Author(s):  
Libor Šmejkal ◽  
Rafael González-Hernández ◽  
T. Jungwirth ◽  
J. Sinova

Electrons, commonly moving along the applied electric field, acquire in certain magnets a dissipationless transverse velocity. This spontaneous Hall effect, found more than a century ago, has been understood in terms of the time-reversal symmetry breaking by the internal spin structure of a ferromagnetic, noncolinear antiferromagnetic, or skyrmionic form. Here, we identify previously overlooked robust Hall effect mechanism arising from collinear antiferromagnetism combined with nonmagnetic atoms at noncentrosymmetric positions. We predict a large magnitude of this crystal Hall effect in a room temperature collinear antiferromagnet RuO2 and catalog, based on symmetry rules, extensive families of material candidates. We show that the crystal Hall effect is accompanied by the possibility to control its sign by the crystal chirality. We illustrate that accounting for the full magnetization density distribution instead of the simplified spin structure sheds new light on symmetry breaking phenomena in magnets and opens an alternative avenue toward low-dissipation nanoelectronics.


2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Z. Z. Du ◽  
C. M. Wang ◽  
Shuai Li ◽  
Hai-Zhou Lu ◽  
X. C. Xie

2021 ◽  
Vol 118 (8) ◽  
pp. e2013386118 ◽  
Author(s):  
Sami Dzsaber ◽  
Xinlin Yan ◽  
Mathieu Taupin ◽  
Gaku Eguchi ◽  
Andrey Prokofiev ◽  
...  

Nontrivial topology in condensed-matter systems enriches quantum states of matter to go beyond either the classification into metals and insulators in terms of conventional band theory or that of symmetry-broken phases by Landau’s order parameter framework. So far, focus has been on weakly interacting systems, and little is known about the limit of strong electron correlations. Heavy fermion systems are a highly versatile platform to explore this regime. Here we report the discovery of a giant spontaneous Hall effect in the Kondo semimetal Ce3Bi4Pd3 that is noncentrosymmetric but preserves time-reversal symmetry. We attribute this finding to Weyl nodes—singularities of the Berry curvature—that emerge in the immediate vicinity of the Fermi level due to the Kondo interaction. We stress that this phenomenon is distinct from the previously detected anomalous Hall effect in materials with broken time-reversal symmetry; instead, it manifests an extreme topological response that requires a beyond-perturbation-theory description of the previously proposed nonlinear Hall effect. The large magnitude of the effect in even tiny electric and zero magnetic fields as well as its robust bulk nature may aid the exploitation in topological quantum devices.


2011 ◽  
Vol 107 (6) ◽  
Author(s):  
Yunyou Yang ◽  
Zhong Xu ◽  
L. Sheng ◽  
Baigeng Wang ◽  
D. Y. Xing ◽  
...  

2013 ◽  
Vol 22 (6) ◽  
pp. 067201 ◽  
Author(s):  
Li Sheng ◽  
Hui-Chao Li ◽  
Yun-You Yang ◽  
Dong-Ning Sheng ◽  
Ding-Yu Xing

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Zhihai He ◽  
Hongming Weng

AbstractIn a system with broken inversion symmetry, a second-order nonlinear Hall effect can survive even in the presence of time-reversal symmetry. In this work, we show that a giant nonlinear Hall effect can exist in twisted bilayer WTe2 system. The Berry curvature dipole of twisted bilayer WTe2 (θ = 29.4°) can reach up to ~1400 Å, which is much larger than that in previously reported nonlinear Hall systems. In twisted bilayer WTe2 system, there exist abundant band anticrossings and band inversions around the Fermi level, which brings a complicated distribution of Berry curvature, and leads to the nonlinear Hall signals that exhibit dramatically oscillating behavior in this system. Its large amplitude and high tunability indicate that the twisted bilayer WTe2 can be an excellent platform for studying the nonlinear Hall effect.


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