Method for obtaining abnormal linearly polarized light current of topological insulator bismuth selenide

A technology of linearly polarized light and bismuth selenide, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc.

Active Publication Date: 2018-05-18
FUZHOU UNIV
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  • Method for obtaining abnormal linearly polarized light current of topological insulator bismuth selenide
  • Method for obtaining abnormal linearly polarized light current of topological insulator bismuth selenide
  • Method for obtaining abnormal linearly polarized light current of topological insulator bismuth selenide

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[0029] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0030] A method for obtaining topological insulator bismuth selenide anomalously linearly polarized photocurrent, comprising the following steps:

[0031] Step S1: Deposit a pair of titanium-gold electrodes on the surface of the bismuth selenide sample by electron beam evaporation, and the distance between the electrodes is 1.2 mm;

[0032] Step S2: Pass the laser through the chopper, polarizer, and half-wave plate in sequence, and then vertically incident on the midpoint of the line connecting the two electrodes of the sample; adjust the half-wave plate so that its main axis direction is the same as that of the polarizer The polarization direction of the device is parallel;

[0033] Step S3: Along the perpendicular bisector of the line connecting the two electrodes, gradually move the laser spot from the left side of the line connecting the t...

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Abstract

The invention discloses a method for obtaining abnormal linearly polarized light current of topological insulator bismuth selenide, laser passes a chopper, a polarizer and a half-wave plate in sequence, along a perpendicular bisector of a connecting line of two electrodes of a bismuth selenide sample, laser spots gradually move from the left side of the connecting line of the two electrodes to theright side according to a fixed distance, in each light spot position, the half-wave plate is rotated from 0 degree to 180 degrees, light current at each angle of the half-wave plate passes a pre-amplifier and a phase-locked amplifier, then enters a data acquisition card and is collected by a computer, fitting calculation is performed on the collected data, a relation between light current of topological insulator bismuth selenide under linearly polarized light vertical incidence in different light spot positions and the angle of the half-wave plate is obtained, and through formula fitting, abnormal linearly polarized light current in different light spot positions is extracted. The method provided by the invention is simple and is easy to realize.

Description

technical field [0001] The invention belongs to the field of topological insulator polarization optics, and in particular relates to a method for obtaining anomalous linearly polarized photocurrent of topological insulator bismuth selenide. Background technique [0002] A topological insulator is a new quantum state of matter, in which the bulk electronic state is an insulating state with an energy gap, and the surface state is a metallic state without an energy gap. Bismuth selenide is a typical representative of topological insulators, because it has a single Dirac cone, the energy band structure is relatively simple, and its bulk energy gap is large (about 0.3eV). Due to the many exotic properties of topological insulators, they have great application prospects in the fields of spintronics and quantum computing. At present, people have carried out a lot of research on topological insulators by photocurrent technology, including circularly polarized photocurrent research,...

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Application Information

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IPC IPC(8): G01R19/00
Inventor 俞金玲谷鹏曾晓琳赵宜升程树英
Owner FUZHOU UNIV
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