Magnetic and noncentrosymmetric Weyl fermion semimetals in the 
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 family of compounds (
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Chang, Guoqing; Singh, Bahadur; Xu, Su; Bian, Guang; Huang, Shin Ming; Hsu, Chao‐Ping; Belopolski, Ilya; Alidoust, Nasser; Sanchez, Daniel S.; Zheng, Hao; Lu, Hong; Zhang, Xiao; Bian, Yi; Chang, Tay Rong; Jeng, Horng Tay; Bansil, Arun; Hsu, Han; Jia, Shuang; Neupert, Titus; Lin, Hsin; Hasan, M. Zahid

doi:10.1103/physrevb.97.041104

Cited by 172 publications

(105 citation statements)

References 71 publications

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“…If both inversion and time-reversal symmetries are broken, Weyl points may disappear by pair annihilation or they might still exist with changed position 36,37 . To examine the effect of the helical ordering on Weyl points, we performed a simple band calculation using the tight binding method (See Supplementary Fig.…”

Section: Discussionmentioning

confidence: 99%

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Park¹,

Oh²,

Uhlířová³

et al. 2018

npj Quant Mater

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Mn 3 Sn has recently attracted considerable attention as a magnetic Weyl semimetal exhibiting concomitant transport anomalies at room temperature. The topology of the electronic bands, their relation to the magnetic ground state and their nonzero Berry curvature lie at the heart of the problem. The examination of the full magnetic Hamiltonian reveals otherwise hidden aspects of these unusual physical properties. Here, we report the full spin wave spectra of Mn 3 Sn measured over a wide momentum -energy range by the inelastic neutron scattering technique. Using a linear spin wave theory, we determine a suitable magnetic Hamiltonian which not only explains the experimental results but also stabilizes the low-temperature helical phase, consistent with our DFT calculations. The effect of this helical ordering on topological band structures is further examined using a tight-binding method, which confirms the elimination of Weyl points in the helical phase. Our work provides a rare example of the intimate coupling between the electronic and spin degrees of freedom for a magnetic Weyl semimetal system. 1 arXiv:1811.07549v1 [cond-mat.str-el]

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Section: Discussionmentioning

confidence: 99%

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Park¹,

Oh²,

Uhlířová³

et al. 2018

npj Quant Mater

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“…The simplest examples of gapless topological phases are graphene [21] and d-wave superconductors [22][23][24] supporting topological flat bands at the edges. Three-dimensional topological semimetals with Dirac points [25][26][27], Weyl points [28][29][30][31][32][33][34][35][36][37], and Dirac lines [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] have been theoretically predicted and experimentally observed. Moreover, nodal topological band structures with topologically protected surface states can arise in superconductors with unconventional pairing symmetries [1,[54][55][56][57][58][59][60][61][62][63][64][65][66].…”

Section: Introductionmentioning

confidence: 99%

Momentum-space structure of surface states in a topological semimetal with a nexus point of Dirac lines

Hyart

Heikkilä

2016

Phys. Rev. B

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Three-dimensional topological semimetals come in different variants, either containing Weyl points or Dirac lines. Here we describe a more complicated momentum-space topological defect where several separate Dirac lines connect with each other, forming a momentum-space equivalent of the real-space nexus considered before for Helium-3. Close to the nexus the Dirac lines exhibit a transition from type I to type II lines. We consider a general model of stacked honeycomb lattices with the symmetry of Bernal (AB) stacked graphite and show that the structural mirror symmetries in such systems protect the presence of the Dirac lines, and also naturally lead to the formation of the nexus. By the bulk-boundary correspondence of topological media, the presence of Dirac lines lead to the formation of drumhead surface states at the side surfaces of the system. We calculate the surface state spectrum, and especially illustrate the effect of the nexus on these states.

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“…2019, 5, 1800466 Figure 9. [140,[143][144][145][146][147][148] Since the wavelengths of the Bloch waves of electrons in solidstate materials are comparable with the lattice constants of the crystals, the electronic properties of the solid-state materials based on the band structures of the electrons are rather sensitive to the lattice modulation, which in turn can be conveniently achieved by electric fields via functional FE materials. a,b) Schematics of the crystal and magnetic structures of the low-temperature noncollinear and the high-temperature collinear phases of Mn 3 Pt, respectively.…”

Section: What Is Beyondmentioning

confidence: 99%

Electric‐Field Control of Magnetic Order: From FeRh to Topological Antiferromagnetic Spintronics

Feng

Yan

Liu

2018

Adv Elect Materials

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approach that is capable of suppressing Joule heating is highly desirable from an energy perspective.Under this background, electric-field control of magnetism emerges in the field of multiferroics, which is expected to reduce the energy consumption of information storage by several orders of magnitude, to fJ bit −1 or even aJ bit −1 . [4][5][6][7][8][9][10][11] In single-phase multiferroic materials, which consists of more than one ferroic order, if there is coupling among different ferroic orders, for example, the magnetoelectric coupling between the ferroelectric (FE) and FM orders, the magnetism can be conveniently controlled by electrical switching of the ferroelectricity, such as in YMnO 3 , BiFeO 3 , and TbMnO 3 . However, the magnetic order in these materials is typically antiferromagnetic, which is difficult to detect, and the magnetoelectric coupling is rather weak; [12][13][14] moreover, intrinsic single-phase multiferroic materials are rare because of contradicting symmetry and physical requirements. [15] All these factors prevent single-phase multiferroic materials from practical device applications.Alternatively, the electric-field control of magnetism can be achieved in heterostructures via other means: (1) in FM/FE composite heterostructures, the magnetism of the FM thin films can be modulated by the piezoelectric strain triggered by electric fields applied onto the ferroelectric substrates; [8] (2) in FM/dielectric composite heterostructures with ultrathin FM thin films, the magnetism can be tailored by the electrostatic doping; [8] (3) in FM/multiferroic composite heterostructures, the magnetism of the FM thin film layers can be varied by electric fields through the interfacial magnetic exchange coupling, such as in Co 0.9 Fe 0.1 /BiFeO 3 heterostructures. [16] Typically, the modulation of magnetism by electric fields in multiferroic heterostructures results in variations in the magnetization, coercivity fields, or magnetic anisotropy of the ferromagnetic materials. In addition, the key scientific issue of controlling magnetic properties using an electric field has been carefully elaborated in previous Reviews. [17,18] Among them, the change of magnetization (ΔM) upon external electric fields (ΔE) yields the simplified magnetoelectric coupling coefficient (strictly speaking, the magnetoelectric coupling coefficient should be described as a tensor; please refer to the previous Reviews) [17,18] α = μ 0 ΔM/ΔE, where μ 0 is the permittivity of free space. Compared with single-phase multiferroics, α in multiferroic heterostructures can be significantly greater, for example, it reaches 1.08 × 10 −7 s m −1 Using an electric field instead of an electric current (or a magnetic field) to tailor the electronic properties of magnetic materials is promising for realizing ultralow-energy-consuming memory devices because of the suppression of Joule heating, especially when the devices are scaled down to the nanoscale. Here, recent results on giant magnetization and resistivity modulation in a metamagnetic inte...

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Magnetic and noncentrosymmetric Weyl fermion semimetals in the RAlGe family of compounds ( R=rareearth

Cited by 172 publications

References 71 publications

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3Sn

Momentum-space structure of surface states in a topological semimetal with a nexus point of Dirac lines

Electric‐Field Control of Magnetic Order: From FeRh to Topological Antiferromagnetic Spintronics

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