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Method for distinguishing circularly polarized light induced current and photon dragging current of topological insulator Sb2Te3

A technology of topological insulators and circularly polarized light, applied in the field of spintronics, can solve problems such as no distinction, and achieve low cost and accurate measurement results

Inactive Publication Date: 2019-06-14
FUZHOU UNIV
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Problems solved by technology

In actual measurement, the photocurrent excited by circularly polarized light usually contains two components, CPGE and CPDE, but there is no effective means to distinguish them

Method used

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  • Method for distinguishing circularly polarized light induced current and photon dragging current of topological insulator Sb2Te3
  • Method for distinguishing circularly polarized light induced current and photon dragging current of topological insulator Sb2Te3
  • Method for distinguishing circularly polarized light induced current and photon dragging current of topological insulator Sb2Te3

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] This embodiment provides a method to distinguish topological insulator Sb 2 Te 3 method of circularly polarized photocurrent and photon drag current, characterized by the measured topological insulator Sb 2 Te 3 Grown on (111) plane InP substrate; topological insulator Sb 2 Te 3 Grow with MBE equipment; Described method comprises the following steps:

[0041] Step S1: Obtain topological insulator Sb 2 Te 3 samples, and in the topological insulator Sb 2 Te 3 A 10nm titanium electrode is grown on the sample by magnetron sputtering; a 100nm gold electrode is evaporated and plated with an electron beam, and the titanium electrode and the gold electrode form a square electrode with a side length of 0.5mm, and the titanium electrode and the gold electrode The electrode spacing of the electrodes is about 2.5mm;

[0042] Step S2: Using a 1064nm...

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Abstract

The invention relates to a method for distinguishing a circularly polarized light induced current and a photon dragging current of a topological insulator Sb2Te3. According to the technical scheme, 1064 nm laser is irradiated on a sample after passing through a polarizer and a quarter-wave plate; the quarter-wave plate is rotated to generate periodically-changed polarized light; and a generated light current is fitted to extract the light current generated by circular polarized laser. Light currents generated by the circular polarized laser under different positive and negative incidence angles are measured; and by utilizing a characteristic that even function components of the circularly polarized light current and the photon dragging current have different parity symmetry, and by utilizing different dependence relations of odd function components of the circularly polarized light current and the photon dragging current to the incident angles, the circularly polarized light current and the photon dragging current are distinguished. The method disclosed by the invention is accurate in measurement result, is simple and feasible, is low in cost and is beneficial to the popularizationand application in the future.

Description

technical field [0001] The invention relates to the field of spintronics, in particular to a method for distinguishing topological insulators Sb 2 Te 3 Circularly polarized photocurrent and photon dragging current methods. Background technique [0002] Topological insulators have attracted widespread attention due to their exotic physical properties and potential applications in quantum computing, spintronics and other fields. Sb 2 Te 3 It is a new type of three-dimensional topological insulator. Its surface state is a fully polarized Dirac electronic state, and the direction of its spin and momentum is locked. This surface state can greatly suppress the scattering of non-magnetic impurities, so its surface electrons have very high electron mobility. This makes surface states have very good application prospects in the fields of new electronic devices and quantum computing. [0003] Circularly polarized photocurrent technique (referred to as CPGE) is a very effective ...

Claims

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Application Information

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IPC IPC(8): G01N21/63G01R19/00
Inventor 俞金玲王雨濛赵宜升程树英赖云锋郑巧
Owner FUZHOU UNIV
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