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Weak measurement-based Weyl semimetal type identification and Weyl cone gradient measurement method

A Weyl semi-metal and type identification technology, applied in the field of topological semi-metal to achieve accurate measurement

Active Publication Date: 2021-06-25
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the role of the Weyl cone tilt in the process of affecting the optical spin Hall effect in all chemical potential ranges and related applications have not been reported so far.

Method used

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  • Weak measurement-based Weyl semimetal type identification and Weyl cone gradient measurement method

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Embodiment 1

[0079] In this embodiment, taking tantalum arsenide as an example, the Weyl semimetal type identification method based on weak measurement provided by the present invention is described in detail.

[0080] The optical spin Hall measurement device based on weak measurement adopted in this embodiment, such as Figure 5 As shown, it includes a laser 1, a half-wave plate 2, a first lens 3, a first polarizer 4, a second polarizer 5, a second lens 6 and a beam collector 7; the laser 1 is a helium-neon laser; the first lens 3 and the second lens 6 are convex lenses; the first polarizer 4 and the second polarizer 5 are Glan laser polarizers; the beam collector 7 is a CCD detector. Such as Figure 5 As shown, the Gaussian beam generated by the laser (incident frequency ω=2.97×10 15 m / s) through the half-wave plate, the first lens and the first polarizer to obtain the incident linearly polarized light, and incident on the surface of the sample 8 and reflected, the reflected light beam...

Embodiment 2

[0091] In this embodiment, the optical spin Hall effect measurement device based on weak measurement is further used to determine the Weyl cone inclination of the Weyl semimetal solid material to be measured according to the following steps:

[0092] L1 adjusts the chemical potential of the Weyl semimetal solid material to be measured

[0093] Under the condition of a given temperature T=0K, according to the method given above, a voltage is first applied between the drain and the source, and then an external gate voltage is applied between the Si substrate and the source, so that the external The chemical potential μ=0.098eV of semi-metallic solid material, at this time,

[0094] L2 Acquires Optical Spin Hall Effect Displacement

[0095] Under the same temperature conditions, with an incident angle of 57.4°, the optical spin Hall effect experiment is carried out through the optical spin Hall effect measurement device given above, and the optical spin Hall effect displacemen...

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Abstract

The invention discloses a weak-measurement-based Weyl semimetal type identification and Weyl cone gradient measurement method. Based on the difference of the influence of the inclination of a first type of Weyl semimetal and the inclination of a second type of Weyl semimetal on the light spin Hall effect, the amplification displacement of the light spin Hall effect in a to-be-measured Weyl semimetal solid material is obtained by using a light spin Hall effect measurement device based on weak measurement, and the type of the to-be-detected Weyl semimetal solid material is determined according to the change of the amplification displacement of the light spin Hall effect. Moreover, the gradient of a Weyl cone is accurately measured by further utilizing the extreme sensitivity of the amplification displacement of the light spin Hall effect to the gradient of the Weyl cone.

Description

technical field [0001] The invention belongs to the technical field of topological semimetals, and relates to Weyl semimetal materials, in particular to Weyl semimetal type identification based on weak measurement and Weyl semimetal Weyl cone inclination measurement technology. Background technique [0002] The Weyl semimetal is a novel topological quantum state with massless Weyl fermions as quasiparticles. It was theoretically predicted by Wan et al. in 2011, and has quickly become a research hotspot in the field of condensed matter physics. In 2015, researchers verified for the first time that TaAs is a Weyl semimetal that breaks space inversion symmetry, and observed the signature features of this type of material, namely the Weyl point and the Fermi arc connecting the two Weyl points. It is worth noting that since the Weyl cone near the Weyl point is usually upright, the Weyl fermions satisfy the Lorentz symmetry, so this kind of material is also called the first kind o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/55G01N21/21
CPCG01N21/39G01N21/55G01N21/21G01N2021/218
Inventor 罗朝明宋益飞刘硕卿
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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