The study of magnetic topological semimetals by first principles calculations

Zou, Jiezhong; He, Zhuoran; Xu, Gang

doi:10.1038/s41524-019-0237-5

Cited by 94 publications

(65 citation statements)

References 192 publications

(262 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This promise stems from a number of exotic quantum phenomena including the quantum anomalous Hall effect, topological *Corresponding authors (HongMing Weng, email: hmweng@iphy.ac.cn; EnKe Liu, email: ekliu@iphy.ac.cn; HuiQian Luo, email: hqluo@iphy.ac.cn) † These authors contributed equally to this work. axion state, and chiral Majorana fermions, etc [1][2][3][4][5][6]. In recent years, an increasing number of intrinsic magnetic materials has been theoretically predicted as magnetic Dirac semimetals (DSMs), Weyl semimetals (WSMs), and topological insulators (TIs) [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Spin excitations and spin wave gap in the ferromagnetic Weyl semimetal Co3Sn2S2

Liu

Gao

et al. 2020

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

We report a comprehensive neutron scattering study on the spin excitations in the magnetic Weyl semimetal Co3Sn2S2 with a quasi-two-dimensional structure. Both in-plane and out-of-plane dispersions of the spin waves were revealed in the ferromagnetic state. Similarly, dispersive but damped spin excitations were found in the paramagnetic state. The effective exchange interactions were estimated using a semi-classical Heisenberg model to consistently reproduce the experimental TC and spin stiffness. However, a full spin wave gap below Eg = 2.3 meV was observed at T = 4 K. This value was considerably larger than the estimated magnetic anisotropy energy (~0.6 meV), and its temperature dependence indicated a significant contribution from the Weyl fermions. These results suggest that Co3Sn2S2 is a three-dimensional correlated system with a large spin stiffness, and the low-energy spin dynamics can interplay with the topological electron states.

show abstract

Section: Introductionmentioning

confidence: 99%

Spin excitations and spin wave gap in the ferromagnetic Weyl semimetal Co3Sn2S2

Liu

Gao

et al. 2020

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

show abstract

“…Temperature-induced Lifshitz transitions are also observed in other TSMs, for example, MTe 5 (M = Zr, Hf)27,28 , which have been used to explain the origin of the resistivity anomaly. However, no such anomaly can be observed in EuAs3 , indicative of its unusual origin. Generally speaking, Lifshitz transitions are related to electronic transitions at zero temperature, and involve abrupt changes of the Fermi surface topology.…”

mentioning

confidence: 91%

“…good ability to manipulate the spin for spintronics applications 3 . Moreover, when magnetism is involved, interactions of the external magnetic field with the magnetic moments can result in exotic properties, such as Weyl states induced by magnetic exchange 4,5 .…”

mentioning

confidence: 99%

Magnetism-induced topological transition in EuAs3

Cheng

Xia

Shi

et al. 2020

Preprint

View full text Add to dashboard Cite

The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead to a variety of novel physics. We present ab initio band calculations, electrical transport and angle-resolved photoemission spectroscopy (ARPES) measurements on the magnetic semimetal EuAs3, demonstrating a magnetism-induced topological transition from a topological nodal-line semimetal in the paramagnetic or the spin-polarized state to a topological massive Dirac metal in the antiferromagnetic (AFM) ground state at low temperature, featuring a pair of massive Dirac points, inverted bands and topological surface states on the (010) surface. Shubnikov-de Haas (SdH) oscillations in the AFM state identify nonzero Berry phase and a negative longitudinal magnetoresistance (n-LMR) induced by the chiral anomaly, confirming the topological nature predicted by band calculations. When magnetic moments are fully polarized by an external magnetic field, an unsaturated and extremely large magnetoresistance (XMR) of ∼ 2×105 % at 1.8 K and 28.3 T is observed, likely arising from topological protection. Consistent with band calculations for the spin-polarized state, four new bands in quantum oscillations different from those in the AFM state are discerned, of which two are topologically protected. Nodal-line structures at the Y point in the Brillouin zone (BZ) are proposed in both the spin-polarized and paramagnetic states, and the latter is proven by ARPES. Moreover, a temperature-induced Lifshitz transition accompanied by the emergence of a new band below 3 K is revealed. These results indicate that magnetic EuAs3 provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology.

show abstract

“…Several intrinsically magnetic 2D materials have attracted considerable attention in recent years, including VX 2 (X = S, Se, Te) [3][4][5][6][7][8][9] , CrGeTe 3 [10][11][12][13] , Fe 3 GeTe 2 [14][15][16][17] , and CrX 3 (X = Cl, Br, I) [18][19][20][21][22][23][24] . Furthermore, the discovery of MnBi 2 Te 4 (MBT) represents another step forward, as it integrates topological feature and alternating ferromagnetic or antiferromagnetic ordering in a single system 1 .…”

Section: Introductionmentioning

confidence: 99%

Nanodevices engineering and spin transport properties of MnBi2Te4 monolayer

Wang

Gong

et al. 2021

npj Comput Mater

View full text Add to dashboard Cite

Two-dimensional (2D) magnetic materials are essential for the development of the next-generation spintronic technologies. Recently, layered van der Waals (vdW) compound MnBi2Te4 (MBT) has attracted great interest, and its 2D structure has been reported to host coexisting magnetism and topology. Here, we design several conceptual nanodevices based on MBT monolayer (MBT-ML) and reveal their spin-dependent transport properties by means of the first-principles calculations. The pn-junction diodes and sub-3-nm pin-junction field-effect transistors (FETs) show a strong rectifying effect and a spin filtering effect, with an ideality factor n close to 1 even at a reasonably high temperature. In addition, the pip- and nin-junction FETs give an interesting negative differential resistive (NDR) effect. The gate voltages can tune currents through these FETs in a large range. Furthermore, the MBT-ML has a strong response to light. Our results uncover the multifunctional nature of MBT-ML, pave the road for its applications in diverse next-generation semiconductor spin electric devices.

show abstract

The study of magnetic topological semimetals by first principles calculations

Cited by 94 publications

References 192 publications

Spin excitations and spin wave gap in the ferromagnetic Weyl semimetal Co3Sn2S2

Spin excitations and spin wave gap in the ferromagnetic Weyl semimetal Co3Sn2S2

Magnetism-induced topological transition in EuAs3

Nanodevices engineering and spin transport properties of MnBi2Te4 monolayer

Contact Info

Product

Resources

About