scholarly journals Type-II nodal line fermions in the Z2 topological semimetals AV6Sb6 ( A =K, Rb, and Cs) with a kagome bilayer

2021 ◽  
Vol 104 (24) ◽  
Author(s):  
Y. Yang ◽  
R. Wang ◽  
M.-Z. Shi ◽  
Z. Wang ◽  
Z. Xiang ◽  
...  
Keyword(s):  
Nodal Line ◽  
Type Ii ◽  
Topological Semimetals

Spin–Orbit-Coupling-Induced Type-I/type-II Dirac Nodal-Line Metal in Nonsymmorphic CaSb2

2019 ◽  
Vol 88 (4) ◽  
pp. 044711 ◽  
Author(s):  
Kohei Funada ◽  
Ai Yamakage ◽  
Naoya Yamashina ◽  
Hiroshi Kageyama
Keyword(s):  
Nodal Line ◽  
Orbit Coupling ◽  
Type I ◽  
Spin Orbit Coupling ◽  
Type Ii ◽  
Spin Orbit

Topological Type-II Nodal Line Semimetal and Dirac Semimetal State in Stable Kagome Compound Mg3Bi2

2017 ◽  
Vol 8 (19) ◽  
pp. 4814-4819 ◽  
Author(s):  
Xiaoming Zhang ◽  
Lei Jin ◽  
Xuefang Dai ◽  
Guodong Liu
Keyword(s):  
Topological Type ◽  
Nodal Line ◽  
Type Ii ◽  
Dirac Semimetal

scholarly journals Magnetism-induced topological transition in EuAs3

2020 ◽  
Author(s):  
Erjian Cheng ◽  
Wei Xia ◽  
Jie Xu ◽  
Chengwei Wang ◽  
Chuanying Xi ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Berry Phase ◽  
Magnetic Moments ◽  
Surface States ◽  
Nodal Line ◽  
Chiral Anomaly ◽  
Topological Transition ◽  
Spin Polarized ◽  
Exotic Physics ◽  
Topological Semimetals

Abstract 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.

scholarly journals Topological Semimetals in Square-Net Materials

2019 ◽  
Vol 49 (1) ◽  
pp. 185-206 ◽  
Author(s):  
Sebastian Klemenz ◽  
Shiming Lei ◽  
Leslie M. Schoop
Keyword(s):  
Hall Effect ◽  
Electronic Properties ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Nodal Line ◽  
Topological Properties ◽  
Topological Materials ◽  
Integer Quantum Hall Effect ◽  
Integer Quantum ◽  
Topological Semimetals

Many materials crystallize in structure types that feature a square net of atoms. While these compounds can exhibit many different properties, some members of this family are topological materials. Within the square-net-based topological materials, the observed properties are rich, ranging, for example, from nodal-line semimetals to a bulk half-integer quantum Hall effect. Hence, the potential for guided design of topological properties is enormous. Here we provide an overview of the crystallographic and electronic properties of these phases and show how they are linked, with the goal of understanding which square-net materials can be topological, and predict additional examples. We close the review by discussing the experimentally observed electronic properties in this family.

Coexistence of open and closed type nodal line topological semimetals in two dimensional B2C

2018 ◽  
Vol 6 (5) ◽  
pp. 1206-1214 ◽  
Author(s):  
P. Zhou ◽  
Z. S. Ma ◽  
L. Z. Sun
Keyword(s):  
Nodal Line ◽  
Two Dimensional ◽  
Nodal Lines ◽  
Closed Type ◽  
Topological Semimetal ◽  
Topological Semimetals

The detection of open and closed type nodal lines in the bilayer topological semimetal B2C on the substrate of Cu(110).

Highly anisotropic type-II nodal line state in pure titanium metal

2018 ◽  
Vol 112 (12) ◽  
pp. 122403 ◽  
Author(s):  
Xiaoming Zhang ◽  
Lei Jin ◽  
Xuefang Dai ◽  
Guodong Liu
Keyword(s):  
Pure Titanium ◽  
Nodal Line ◽  
Type Ii ◽  
Titanium Metal

Three-dimensional borophene: A light-element topological nodal-line semimetal with direction-dependent type-II Weyl fermions

2020 ◽  
Vol 102 (15) ◽  
Author(s):  
Leyuan Cui ◽  
Tielei Song ◽  
Jiangtao Cai ◽  
Xin Cui ◽  
Zhifeng Liu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Light Element ◽  
Nodal Line ◽  
Type Ii ◽  
Dependent Type ◽  
Weyl Fermions

A nonsymmorphic-symmetry-protected hourglass Weyl node, hybrid Weyl node, nodal surface, and Dirac nodal line in Pd4X (X = S, Se) compounds

2020 ◽  
Vol 22 (39) ◽  
pp. 22399-22407
Author(s):  
Weizhen Meng ◽  
Ying Liu ◽  
Xiaoming Zhang ◽  
Xuefang Dai ◽  
Guodong Liu
Keyword(s):  
Nodal Line ◽  
Nodal Surface ◽  
Topological Semimetals ◽  
Symmetry Protected

Nonsymmorphic symmetry has been proved to protect band crossings in topological semimetals/metals.

scholarly journals Magneto-Optical Transport Properties of Type-II Nodal Line Semimetals

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3035
Author(s):  
Yanmei Sun ◽  
Jing Li ◽  
Hui Zhao ◽  
Meimei Wu ◽  
Hui Pan
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Polarized Light ◽  
Nodal Line ◽  
Landau Levels ◽  
Hall Conductivity ◽  
Type Ii ◽  
Circularly Polarized Light ◽  
Double Peaks ◽  
Optical Transport

We investigate the magneto-optical transport properties and Landau levels of type-II nodal line semimetals. The tilted liner dispersion in type-II nodal line semimetals makes the conduction band and valence band asymmetric, and Landau levels are coupling in the presence of a magnetic field. We find the background of absorption peaks is curved. The oscillation peaks are tailless with the change of magnetic field. Through tuning tilt term, we find the absorption peaks of optical conductivity change from incomplete degenerate structure to splitting double peaks structure. We also find interband absorption peaks is no longer zero in the imaginary part of Hall conductivity. With the change of the tilt term, the contribution of the absorption peak has two forms, one is that the negative peak only appears at high frequencies, and the other is two adjacent peaks with opposite signs. In addition, the resistivity, circularly polarized light and magnetic oscillation of Hall conductivity are studied.

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