Interaction Modulation By Electromagnetic Field Of Charged Particles Moving Above Two-dimensional Electron Gases

The interaction between charged particles and two-dimensional quantum electron gases(2DQEG)is an important research content in surface physics.It is also a typical cross-topic in the fields of plasma physics,solid-state and nuclear physics.With the development of modern microelectronics technology,the design scale of electronic devices is getting smaller,the thickness is getting thinner,and the density is getting higher.It is more and more essential to study the properties of solid surfaces.The study of the interaction between charged particles and 2DQEG has essential applications in the coating,etching,and modification of the material surface.Besides,the study of the interaction between charged particles and 2DQEG also has essential applications in the mass production of semiconductors and integrated circuits.In terms of studying the properties of the material surface,the use of incident-charged particles as probes to detect the material surface properties is also an important application field for studying the interaction between charged particles and 2DQEG.This article first introduces the research background of the interaction between charged particles modulated by electromagnetic field and 2DQEG.The focus is on the research history of the stopping power of charged particles in the interaction between charged particles and 2DQEG,the perturbation density of 2DQEG,and the research history of wake potential.Combined with the current theoretical and experimental research progress on the interaction between charged particles modulated by electromagnetic fields and 2DQEG,this article's research content is introduced.In chapter 2,the method of deriving the Quantum Hydrodynamics(QHD)equation from the Winger equation is briefly introduced.The continuity equation,momentum balance equation,and Poisson equation of QHD are obtained.Then we use the QHD to deduce the perturbation density of the 2DQEG and the stopping power of the charged particles when the charged particle interacts with the 2DQEG.Then,we introduced the exchange-correlation potential to modify the QHD and calculated the perturbation density of the 2DQEG and the stopping power of the incident charged particles after the exchange-correlation potential was introduced.The study found that the modified QHD is more accurate.In Chapter 3,we use the modified QHD to study the modulation of the interaction between charged particles and 2DQEG by the high-frequency oscillating electric field.Studies have found that the wavelength,amplitude,and phase of the high-frequency oscillating electric field have significant modulation effects on the stopping power of charged particles and the perturbation density of the 2DQEG.With the increase of the oscillating electric field's intensity,the perturbation density of the 2DQEG and the amplitude of the stopping power of the charged particles also increase.And because of the periodicity of the oscillating electric field,the perturbation density of the 2DQEG and the charged particles' stopping power will also oscillate periodically.Chapter 4 uses the QHD to study the modulation of the interaction between charged particles and 2DQEG by the steady magnetic field.The study found that applying a magnetic field to the 2DQEG along the-z or z direction does not affect the perturbation density of the 2DQEG and the incident-charged particles' stopping power.The magnetic field strength of the steady magnetic field has a significant modulation effect on the stopping power of charged particles and the perturbation density of the 2DQEG.As the intensity of the stable magnetic field increases,the value of the perturbation density of the 2DQEG gradually decreases,but the oscillation period of the perturbation density of the 2DQEG increases.The stopping power of charged particles decreases as the intensity of the steady magnetic field increases.Applying a strong and stable magnetic field to the 2DQEG can be used as an effective means to reduce the perturbation density of the 2DQEG,and the stopping power of incident charged particles.