A Method for Controlling the Circular Polarization Dependent Photocurrent of Tellurium Antimonide Thin Films
A photocurrent, circularly polarized technology, applied in circuits, electrical components, sustainable manufacturing/processing, etc., can solve the problems of effective regulation of circularly polarized related photocurrents without a three-dimensional topological insulator antimonide telluride, and achieve low cost, regulation and control. The effect is obvious and the control range is large
Active Publication Date: 2021-08-31
FUZHOU UNIV
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[0003] However, there is no effective method to control the circular polarization-dependent photocurrent of the three-dimensional topological insulator tellurium antimonide
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[0025] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.
[0026] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0027] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components...
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Abstract
The invention relates to a method for adjusting and controlling the circular polarization-related photocurrent of a tellurium antimonide thin film. Paste the tellurium antimonide film on the copper block, and change the temperature of the tellurium antimonide film by changing the temperature of the copper block, because the laser will heat the area irradiated by the laser, and because the light intensity on the upper surface is greater than that reaching the substrate Light intensity, so there is a temperature gradient between the upper surface and the substrate; due to the thermoelectric effect, this temperature gradient will generate a thermoelectric potential energy perpendicular to the sample surface; under the action of this thermoelectric potential energy, a spin flow perpendicular to the sample surface will be generated ; Due to the inverse spin Hall effect, a transverse charge flow related to circular polarization is generated; when the temperature changes, the thermoelectric potential energy between the upper surface and the substrate will change, so that the inverse spin Hall effect The induced charge flow will also change, enabling the regulation of the circular polarization-dependent photocurrent. The control effect of the present invention is remarkable, simple and easy to implement, low in cost, and beneficial to popularization and application in the future.
Description
technical field [0001] The invention relates to the field of polarized photocurrent regulation, in particular to a method for regulating the photocurrent related to the circular polarization of a tellurium antimonide thin film. Background technique [0002] The surface states of three-dimensional topological insulators have strong spin-orbit coupling, so they have promising applications in spintronic devices and quantum computing. The three-dimensional topological insulator tellurium antimonide has the characteristics of simple energy band structure and strong pyroelectric effect, so it has attracted extensive attention. When the three-dimensional topological insulating tellurium antimonide is irradiated with circularly polarized light, due to the spin-orbit coupling effect, the direction of the photocurrent generated by the left-handed light and right-handed light will be directional. This current related to the degree of polarization of circularly polarized light is calle...
Claims
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IPC IPC(8): H01L31/18H01L31/032
CPCH01L31/032H01L31/18Y02P70/50
Inventor 俞金玲庄航赵宜升程树英
Owner FUZHOU UNIV