Magnetic field measuring meter based on topological insulator and magnetic field measuring method

A topological insulator and magnetic field measurement technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems of narrow linear range, limited application, impact of impurities, etc., and achieve the effect of widening the detection range of magnetic field

Active Publication Date: 2013-12-18
PEKING UNIV
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Problems solved by technology

However, traditional probes generally use semiconductor materials with a narrow linear range, can only work in a small temperature

Method used

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  • Magnetic field measuring meter based on topological insulator and magnetic field measuring method
  • Magnetic field measuring meter based on topological insulator and magnetic field measuring method
  • Magnetic field measuring meter based on topological insulator and magnetic field measuring method

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Embodiment Construction

[0025] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0026] figure 1 is the energy band structure diagram of topological insulators, where (a) is the energy band structure diagram of two-dimensional topological insulators, and (b) is the energy band structure diagram of three-dimensional topological insulators. Such as figure 1 As shown, there is an energy gap between the valence band and the conduction band in the body of the topological insulator, and there are Dirac cones with a linear dispersion relationship on the surface. Unlike graphene, the number of Dirac cones in topological insulators is odd. This surface state Protected by time-reversal symmetry.

[0027] Such as figure 2Shown, the magnetic field meter based on the topological insulator of the present embodiment, the topological insulator is on the xy plane, and the magnetic field is along the z direction, and a pair of current ele...

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Abstract

The invention discloses a magnetic field measuring meter based on a topological insulator and a magnetic field measuring method. The magnetic field measuring meter comprises a probe and an analyzer, wherein the probe is the flat-plate-shaped topological insulator and the analyzer is a magnetic resistance signal analyzer. The direction of a magnetic field is perpendicular to the surface of the topological insulator; a pair of current electrodes and a pair of magnetic resistance electrodes are arranged on the surface of the topological insulator, and the current electrodes and the magnetic resistance electrodes are in the same direction; the magnetic resistance electrodes are connected with a magnetic resistance signal analyzer. The topological insulator is insensitive to the temperature and can be used within a wide range. The magnetic field measuring meter based on the topological insulator greatly widens magnetic field probing interval of a traditional probe, can well work in a low-temperature region, and is very suitable for laboratory study under extreme conditions like medical nuclear magnetic resonance imaging, military electromagnetic pulse bomb effect measuring and astronautic extremely-low universe temperature and plasma storm high fields; combined with the Hall effect, the magnetic field measuring meter based on the topological insulator can be well applied to traditional fields.

Description

technical field [0001] The invention relates to a magnetic field measurement technology, in particular to a topological insulator-based magnetic field measuring meter and a measuring method thereof. Background technique [0002] The traditional magnetic field measurement uses a Tesla meter, which is based on the Hall effect. The Tesla meter includes a probe and a meter. However, traditional probes generally use semiconductor materials with a narrow linear range, can only work in a small temperature range and field strength, and are significantly affected by impurities, so their applications in extreme environments are limited. However, with the deepening of research and production, magnetic measurement under extreme conditions has become a necessary subject. [0003] Topological insulators, a state of matter with novel quantum properties, have been one of the important scientific frontiers of physics in recent years. Topological insulators are a new quantum state of matter...

Claims

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Application Information

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IPC IPC(8): G01R33/09G01R33/07
Inventor 王健马铮刘易赵弇菲王慧超
Owner PEKING UNIV
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