The Study Of InSe And MoTe₂ On Angle-resolved Photoelectron Spectroscopy

Two-dimensional materials are one of the most interesting discoveries in the past two decades.Their unique properties indicate a broad application prospect.The study of the properties of two-dimensional materials has greatly promoted the development of condensed matter physics.The study of two-dimensional materials is an important discipline that integrates sample growth,instrument characterization,and experimental and theoretical research.This article briefly introduces the development of two-dimensional materials in the introductory part,as well as some of the special properties of graphene.The second chapter mainly introduces the common synthesis methods and research methods of two-dimensional materials.The third chapter focuses on our experimental instruments,which have high momentum resolution and energy resolution,and the instrument performance is at the international advanced level.It will introduce the principle of ARPES and Spin-ARPES in detail,as well as the working process of the spectrometer.In Chapter 4,we study the electronic structure of InSe materials by using angle-resolved photoelectron spectroscopy.In order to obtain better energy resolution,we cooled the liquid nitrogen and found that its valence band shifted toward lower binding energy during cooling.The warming process is the opposite.In this regard,we make conjectures and assumptions and verify them with theoretical calculations.Finally,it is known that the change in temperature causes a change in the crystal lattice,thereby making the valence band move.In the fifth chapter,we observed the band splitting near the K-point in the study of the electronic structure of MoTe2,and confirmed that there is a strong spin signal through the spin-Mott detector.