Anisotropic magnetotransport in Dirac-Weyl magnetic junctions

Ominato, Yuya; Kobayashi, Koji; Nomura, Kentaro

doi:10.1103/physrevb.95.085308

Cited by 12 publications

(11 citation statements)

References 62 publications

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“…The bulk Hall effect with a large Hall angle can be achieved in magnetic Weyl semimetals (WSMs). The magnetic WSM [6][7][8][19][20][21][22][23][24] is a time-reversal-broken topological state and is one of the promising systems for next-generation spintronics devices due to its fancy transport properties (e.g., huge longitudinal magnetoresistance effects [25][26][27]). The magnetic WSM state is proposed in magnetic kagome layered materials (Fe 3 Sn 2 [28,29], Co 3 Sn 2 S 2 [30][31][32][33][34][35][36], and Mn 3 Sn [37][38][39]), and Heusler compounds (Ti 2 MnAl [40], Co 2 MnGa [41,42], and Co 2 MnAl [43]).…”

Section: Hall Magnetoresistancementioning

confidence: 99%

Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals

Kobayashi,

Nomura

2020

Preprint

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We propose an unconventional type of Hall effect in a topological Dirac semimetal with ferromagnetic electrodes. The topological Dirac semimetal itself has time-reversal symmetry, whereas attached ferromagnetic electrodes break it, causing the large Hall response. This induced Hall effect is a characteristic of the helical surface states of topological Dirac semimetals and the helical edge states of quantum spin Hall insulators. We compute the Hall conductance/resistance and the Hall angle by using a lattice model with four-terminal geometry. For topological Dirac semimetals with four electrodes, the induced Hall effect occurs whether the current electrodes or the voltage electrodes are ferromagnetic. When the spins in electrodes are almost fully polarized, the Hall angle becomes as large as that of quantum Hall states or ideal magnetic Weyl semimetals. We show the robustness of the induced Hall effect against impurities and also discuss the spin injection and spin decay problems. This Hall response can be used to detect whether the magnetizations of the two ferromagnetic electrodes are parallel or antiparallel.

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Section: Hall Magnetoresistancementioning

confidence: 99%

Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals

Kobayashi,

Nomura

2020

Preprint

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“…The system we will study is schematically shown in Figure 1, which is often called the Dirac–Weyl magnetic junction . The arrows denote the direction of electrons and L is the length of the ferromagnetic Weyl semimetal, which is sandwiched between two Dirac semimetals.…”

Section: In a Dirac–weyl Magnetic Junctionmentioning

confidence: 99%

“…This attractive field begins with the discovery of topological insulators (TIs) with various peculiar physical phenomena, such as the quantum spin Hall effect and the quantum anomalous Hall effect . The realizations of Dirac, Weyl, and nodal line semimetals give us the chance to paint a portrait on a much larger canvas . Particularly, a Dirac semimetal can exhibit double degeneration of the pseudorelativistic linear dispersions with time‐reversal and spatial‐inversion symmetries, while Weyl semimetals provide the gapless linear dispersions with broken time‐reversal or spatial‐inversion symmetries .…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19][20] The realizations of Dirac, Weyl, and nodal line semimetals give us the chance to paint a portrait on a much larger canvas. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Particularly, a Dirac semimetal can exhibit double degeneration of the pseudorelativistic linear dispersions with time-reversal and spatial-inversion symmetries, [25][26][27] while Weyl semimetals provide the gapless linear dispersions with broken time-reversal [33,34] DOI: 10.1002/andp.201900399 or spatial-inversion symmetries. [29,30] Therefore, the study of electron transport in topological materials has also become of interest in many literature.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Environment on the Scattering of Electrons by a Junction of Different Topological Materials

Shao

2020

Annalen der Physik

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The studies of electron transport through a junction of topological materials in the literature so far ignore the coupling of a topological material to its surrounding environment. Here, the dynamics of an open system through a stochastic Hamiltonian are simulated to investigate the influence of the environment on the scattering of electrons by a junction of different topological materials, such as a Dirac–Weyl magnetic junction and a topological insulator. It is found that, although the detrimental effect of the environment is inevitable, the Landauer conductance can be enhanced via adjusting the system–environment coupling strength. This result supplies the possibilty of changing the transport feature of topological materials by modulating the surrounded environment. It is also demonstrated that a non‐Hermitian Hamiltonian can be used to replace the stochastic Hamiltonian for this study, when the system and the environment coupling are weak.

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“…It was seen both analytically and numerically that a magnetic domain wall in a Weyl semimetal gives rise to a large domain wall magnetoresistance, due to the mismatch of the electron helicity beyond the domain wall. [160,161] One of the peculiar features of magnetic domain walls in Weyl semimetals is the emergence of 1D zero modes localized at the domain wall. [130,131] These zero modes can be regarded as the remnant of the surface Fermi arc of Weyl semimetal.…”

Section: Example: Magnetic Domain Wallsmentioning

confidence: 99%

Magnetic Textures and Dynamics in Magnetic Weyl Semimetals

Araki

2019

Annalen der Physik

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Recent theoretical and experimental attempts have been successful in finding magnetic Weyl semimetal phases, which show nodal‐point structure in the electronic bands as well as magnetic orders. Beyond uniform ferromagnetic or antiferromagnetic orders, nonuniform magnetic textures, such as domain walls and skyrmions, enrich the properties of the Weyl electrons even more in such materials. Here, a topical review on interplay between Weyl electrons and magnetic textures in those magnetic Weyl semimetals is given. The basics of magnetic textures in nontopological magnetic metals are reviewed first, and then the effect of magnetic textures in Weyl semimetals is discussed, regarding the recent theoretical and experimental progress therein. The idea of the fictitious “axial gauge fields” is pointed out, which effectively describes the effect of magnetic textures on the Weyl electrons and can well account for the properties of the electrons localized around magnetic domain walls.

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Anisotropic magnetotransport in Dirac-Weyl magnetic junctions

Cited by 12 publications

References 62 publications

Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals

Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals

Effect of Environment on the Scattering of Electrons by a Junction of Different Topological Materials

Magnetic Textures and Dynamics in Magnetic Weyl Semimetals

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