Large magnetoresistance in the type-II Weyl semimetal semimetal WP[subscript 2]

The discovery of Dirac semimetal and Weyl semimetal has motivated a growing passion for investigating the unique magneto-transport properties in the topological materials. A Weyl semimetal can host Weyl fermions as its low-energy quasi-particle excitations, and therefore perform exotic features analogous to those in high-energy physics, such as the violation of the chiral charge conservation known as the chiral anomaly. One of the electrical transport signatures of the chiral anomaly is the Adler–Bell–Jackiw (ABJ) anomaly which presents as a negative magnetoresistance when the magnetic field and the current are parallel. Very recently, numerous experiments reported negative longitudinal magnetoresistance (NLMR) in topological materials, but the details of the measurement results are various. Here the materials and the corresponding experiment results are briefly reviewed. Besides the plausible explanation of the ABJ anomaly, some other origins of the NLMR are also discussed.

Weyl semimetal

Anomaly (physics)

10.1088/1674-1056/25/11/117204

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Large Hall Signal due to Electrical Switching of an Antiferromagnetic Weyl Semimetal State

Small Science (2021)

Hanshen Tsai Tomoya Higo Kouta Kondou Shoya Sakamoto A. Kobayashi

Developing a technology to electrically manipulate a Weyl semimetal state is a vital step for designing a nonvolatile memory using topologically robust properties. Recently, such manipulation is realized for the first time in the antiferromagnetic Weyl semimetal Mn 3 Sn using the readout signal of anomalous Hall effect in the Mn 3 Sn/heavy metal (Pt, W) heterostructures. Here, it is reported that the switching of Hall signal can be significantly enhanced by 1) removing the buffer layer of Ru to adjust the crystal orientation of Mn 3 Sn, and 2) annealing after deposition of the heavy metal to change the interfacial condition. The switching of the Hall resistance is 0.35 Ω in the Mn 3 Sn/W sample, which becomes one order of magnitude larger than the previously reported value using Ru/Mn 3 Sn/Pt heterostructures. Moreover, by increasing the read current, it is found that the readout voltage may go well beyond 1 mV, a milestone for future applications in memory technology.

Weyl semimetal

10.1002/smsc.202000025

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Kondo-Weyl semimetal behavior in Ce 3 Bi 4 Pd 3

Bulletin of the American Physical Society (2019)

Sami Dzsaber G. Eguchi D. A. Zocco А Д Сидоренко Xinlin Yan

Weyl semimetal

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Observation of a T d -1T’ structural phase transition at ambient pressure in Weyl semimetal WTe 2