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View article: Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi <sub>2</sub> Te <sub>4</sub>
Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi <sub>2</sub> Te <sub>4</sub> Open
Quantum anomalous Hall goes intrinsic Quantum anomalous Hall effect—the appearance of quantized Hall conductance at zero magnetic field—has been observed in thin films of the topological insulator Bi 2 Se 3 doped with magnetic atoms. The d…
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Weighted Mobility Open
Engineering semiconductor devices requires an understanding of charge carrier mobility. Typically, mobilities are estimated using Hall effect and electrical resistivity meausrements, which are are routinely performed at room temperature an…
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Large anomalous Hall effect driven by a nonvanishing Berry curvature in the noncolinear antiferromagnet Mn <sub>3</sub> Ge Open
A large anomalous Hall effect is observed in the triangular antiferromagnet Mn 3 Ge arising from an intrinsic electronic Berry phase.
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Magnetic Weyl semimetal phase in a Kagomé crystal Open
Magnetic Weyl semimetals Weyl semimetals (WSMs)—materials that host exotic quasiparticles called Weyl fermions—must break either spatial inversion or time-reversal symmetry. A number of WSMs that break inversion symmetry have been identifi…
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Crystal time-reversal symmetry breaking and spontaneous Hall effect in collinear antiferromagnets Open
Identification of a previously overlooked spontaneous Hall effect mechanism creates opportunities in low-dissipation spintronics.
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The Quantum Anomalous Hall Effect: Theory and Experiment Open
The quantum anomalous Hall effect is defined as a quantized Hall effect realized in a system without an external magnetic field. The quantum anomalous Hall effect is a novel manifestation of topological structure in many-electron systems a…
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Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KV <sub>3</sub> Sb <sub>5</sub> Open
The anomalous Hall effect soars when Dirac quasiparticles meet frustrated magnetism.
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Spin Torque Study of the Spin Hall Conductivity and Spin Diffusion Length in Platinum Thin Films with Varying Resistivity Open
We report measurements of the spin torque efficiencies in perpendicularly magnetized Pt/Co bilayers where the Pt resistivity ρ_{Pt} is strongly dependent on thickness t_{Pt}. The dampinglike spin Hall torque efficiency per unit current den…
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Interface-driven topological Hall effect in SrRuO <sub>3</sub> -SrIrO <sub>3</sub> bilayer Open
Electronic transport measurements reveal the formation of swirling spin textures, skyrmions, at high-quality oxide interface.
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<i>Colloquium</i>: Quantum anomalous Hall effect Open
The quantum Hall (QH) effect, quantized Hall resistance combined with zero longitudinal resistance, is the characteristic experimental fingerprint of Chern insulators—topologically nontrivial states of two-dimensional matter with broken ti…
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Concurrence of anomalous Hall effect and charge density wave in a superconducting topological kagome metal Open
As one of the most fundamental physical phenomena, the anomalous Hall effect\n(AHE) typically occurs in ferromagnetic materials but is not expected in the\nconventional superconductors. Here, we have observed a giant AHE in kagome\nsuperco…
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Topological Weyl semimetals in the chiral antiferromagnetic materials Mn<sub>3</sub>Ge and Mn<sub>3</sub>Sn Open
Recent experiments revealed that Mn3Sn and Mn3Ge exhibit a strong anomalous\nHall effect at room temperature, provoking us to explore their electronic\nstructures for topological properties. By ab initio band structure\ncalculations, we ha…
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Above-room-temperature strong intrinsic ferromagnetism in 2D van der Waals Fe3GaTe2 with large perpendicular magnetic anisotropy Open
The absence of two-dimensional (2D) van der Waals (vdW) ferromagnetic crystals with both above-room-temperature strong intrinsic ferromagnetism and large perpendicular magnetic anisotropy (PMA) severely hinders practical applications of 2D…
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Mechanism for Anomalous Hall Ferromagnetism in Twisted Bilayer Graphene Open
Motivated by the recent observation of an anomalous Hall effect in twisted bilayer graphene, we use a lowest Landau level model to understand the origin of the underlying symmetry-broken correlated state. This effective model is rooted in …
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Chiral Anomaly as the Origin of the Planar Hall Effect in Weyl Semimetals Open
In condensed matter physics, the term "chiral anomaly" implies the violation of the separate number conservation laws of Weyl fermions of different chiralities in the presence of parallel electric and magnetic fields. One effect of the chi…
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Enhanced spin–orbit torques by oxygen incorporation in tungsten films Open
The origin of spin–orbit torques, which are generated by the conversion of charge-to-spin currents in non-magnetic materials, is of considerable debate. One of the most interesting materials is tungsten, for which large spin–orbit torques …
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Cluster multipole theory for anomalous Hall effect in antiferromagnets Open
We introduce a cluster extension of multipole moments to discuss the\nanomalous Hall effect (AHE) in both ferromagnetic (FM) and antiferromagnetic\n(AFM) states in a unified framework. We first derive general symmetry\nrequirements for the…
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Spontaneous Anomalous Hall Effect Arising from an Unconventional Compensated Magnetic Phase in a Semiconductor Open
The anomalous Hall effect, commonly observed in metallic magnets, has been established to originate from the time-reversal symmetry breaking by an internal macroscopic magnetization in ferromagnets or by a noncollinear magnetic order. Here…
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Tuning the spin Hall effect of Pt from the moderately dirty to the superclean regime Open
We systematically measure and analyze the spin diffusion length and the spin Hall effect in Pt with a wide range of conductivities using the spin absorption method in lateral spin valve devices. We observe a linear relation between the spi…
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Measuring Hall viscosity of graphene’s electron fluid Open
Electron hydrodynamics in graphene Electrons can move through graphene in a manner reminiscent of fluids, if the conditions are right. Two groups studied the nature of this hydrodynamic flow in different regimes (see the Perspective by Luc…
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A Centrosymmetric Hexagonal Magnet with Superstable Biskyrmion Magnetic Nanodomains in a Wide Temperature Range of 100–340 K Open
Superstable biskyrmion magnetic nanodomains are experimentally observed for the first time in a hexagonal MnNiGa, a common and easily produced centrosymmetric material. The biskyrmion states in MnNiGa thin plates, as determined by the comb…
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Notes on Anomaly Induced Transport Open
Chiral anomalies give rise to dissipationless transport phenomena such as the\nchiral magnetic and vortical effects. In these notes I review the theory from a\nquantum field theoretic, hydrodynamic and holographic perspective. A physical\n…
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MOCVD grown epitaxial β-Ga2O3 thin film with an electron mobility of 176 cm2/V s at room temperature Open
In this work, we report record electron mobility values in unintentionally doped β-Ga2O3 films grown by metal-organic chemical vapor deposition. Using degenerately Sn-doped regrown n+ β-Ga2O3 contact layers, we were able to maintain Ohmic …
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Highly-ordered wide bandgap materials for quantized anomalous Hall and magnetoelectric effects Open
An interplay of spin-orbit coupling and intrinsic magnetism is known to give\nrise to the quantum anomalous Hall and topological magnetoelectric effects\nunder certain conditions. Their realization could open access to low power\nconsumpti…
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Giant planar Hall effect in topological metals Open
Much excitement has been generated recently by the experimental observation\nof the chiral anomaly in condensed matter physics. This manifests as strong\nnegative longitudinal magnetoresistance and has so far been clearly observed in\nNa$_…
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Giant Room Temperature Interface Spin Hall and Inverse Spin Hall Effects Open
The spin Hall angle (SHA) is a measure of the efficiency with which a transverse spin current is generated from a charge current by the spin-orbit coupling and disorder in the spin Hall effect (SHE). In a study of the SHE for a Pt|Py (Py=N…
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Strong Intrinsic Spin Hall Effect in the TaAs Family of Weyl Semimetals Open
Since their discovery, topological insulators have been expected to be ideal\nspintronic materials owing to the spin currents carried by surface states with\nspin--momentum locking. However, the bulk doping problem remains an obstacle\ntha…
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Quantum Valley Hall Effect, Orbital Magnetism, and Anomalous Hall Effect in Twisted Multilayer Graphene Systems Open
We study the electronic structures and topological properties of (M + N)-layer twisted graphene systems. We consider the generic situation that N-layer graphene is placed on top of the other M-layer graphene and is twisted with respect to …
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Orbital torque in magnetic bilayers Open
The orbital Hall effect describes the generation of the orbital current flowing in a perpendicular direction to an external electric field, analogous to the spin Hall effect. As the orbital current carries the angular momentum as the spin …
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Magnon Spin Nernst Effect in Antiferromagnets Open
We predict that a temperature gradient can induce a magnon-mediated spin Hall response in an antiferromagnet with nontrivial magnon Berry curvature. We develop a linear response theory which gives a general condition for a Hall current to …