Anisotropic Nodal‐Line‐Derived Large Anomalous Hall Conductivity in ZrMnP and HfMnP (Adv. Mater. 48/2021)

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.

Download Full-text

HALL CONDUCTIVITY AS THE TOPOLOGICAL INVARIANT IN PHASE SPACE IN THE PRESENCE OF INTERACTIONS AND NON-UNIFORM MAGNETIC FIELD

Письма в Журнал экспериментальной и теоретической физики ◽

10.1134/s0370274x19190081 ◽

2019 ◽

Vol 110 (7-8 (10)) ◽

pp. 480-481 ◽

Cited By ~ 3

Author(s):

C.X. ZHANG ◽

M.A. ZUBKOV

Keyword(s):

Magnetic Field ◽

Phase Space ◽

Uniform Magnetic Field ◽

Topological Invariant ◽

Hall Conductivity

Download Full-text

Computation and data driven discovery of topological phononic materials

Nature Communications ◽

10.1038/s41467-021-21293-2 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jiangxu Li ◽

Jiaxi Liu ◽

Stanley A. Baronett ◽

Mingfeng Liu ◽

Lei Wang ◽

...

Keyword(s):

High Throughput Screening ◽

Electronic System ◽

Nodal Line ◽

Data Driven ◽

Single Type ◽

Type I ◽

Structure Property ◽

Topological Quantum ◽

Data Driven Approach ◽

Spin Electronic

AbstractThe discovery of topological quantum states marks a new chapter in both condensed matter physics and materials sciences. By analogy to spin electronic system, topological concepts have been extended into phonons, boosting the birth of topological phononics (TPs). Here, we present a high-throughput screening and data-driven approach to compute and evaluate TPs among over 10,000 real materials. We have discovered 5014 TP materials and grouped them into two main classes of Weyl and nodal-line (ring) TPs. We have clarified the physical mechanism for the occurrence of single Weyl, high degenerate Weyl, individual nodal-line (ring), nodal-link, nodal-chain, and nodal-net TPs in various materials and their mutual correlations. Among the phononic systems, we have predicted the hourglass nodal net TPs in TeO3, as well as the clean and single type-I Weyl TPs between the acoustic and optical branches in half-Heusler LiCaAs. In addition, we found that different types of TPs can coexist in many materials (such as ScZn). Their potential applications and experimental detections have been discussed. This work substantially increases the amount of TP materials, which enables an in-depth investigation of their structure-property relations and opens new avenues for future device design related to TPs.

Download Full-text

2D‐Berry‐Curvature‐Driven Large Anomalous Hall Effect in Layered Topological Nodal‐Line MnAlGe

Advanced Materials ◽

10.1002/adma.202006301 ◽

2021 ◽

pp. 2006301

Author(s):

Satya N. Guin ◽

Qiunan Xu ◽

Nitesh Kumar ◽

Hsiang‐Hsi Kung ◽

Sydney Dufresne ◽

...

Keyword(s):

Hall Effect ◽

Anomalous Hall Effect ◽

Nodal Line ◽

Berry Curvature ◽

Curvature Driven

Download Full-text

An improved holographic nodal line semimetal

Journal of High Energy Physics ◽

10.1007/jhep05(2021)141 ◽

2021 ◽

Vol 2021 (5) ◽

Author(s):

Yan Liu ◽

Xin-Meng Wu

Keyword(s):

Mass Term ◽

Nodal Line ◽

Duality Relation ◽

Strongly Coupled ◽

Nodal Lines ◽

Form Field ◽

Improved Model ◽

Fermionic Spectrum ◽

Chern Simons ◽

Tensor Operators

Abstract We study an improved holographic model for the strongly coupled nodal line semimetal which satisfies the duality relation between the rank two tensor operators $$ \overline{\psi}{\gamma}^{\mu v}\psi $$ ψ ¯ γ μv ψ and $$ \overline{\psi}{\gamma}^{\mu v}{\gamma}^5\psi $$ ψ ¯ γ μv γ 5 ψ . We introduce a Chern-Simons term and a mass term in the bulk for a complex two form field which is dual to the above tensor operators and the duality relation is automatically satisfied from holography. We find that there exists a quantum phase transition from a topological nodal line semimetal phase to a trivial phase. In the topological phase, there exist multiple nodal lines in the fermionic spectrum which are topologically nontrivial. The bulk geometries are different from the previous model without the duality constraint, while the resulting properties are qualitatively similar to those in that model. This improved model provides a more natural ground to analyze transports or other properties of strongly coupled nodal line semimetals.

Download Full-text