Shot Noise In Quantum Dot System Under The Perturbation Of Photon Field

With the developing of science and technology, the device is coming into micro-nanometer scaler. In the mesoscopic system, the Ohm’s Law is instead of Landauer-B¨uttiker formula.Compared to the resistance of the system, shot noise can give more information of the system.This paper has five parts. Firstly, we introduce the domestic and foreign development of this field. Then, the shot noise in a few kinds of quantum dot systems are investigated. At last,we give a summary and outlook.In the first chapter, we introduce the concept and principle of electron transport in the mesoscopic system. Then, development of the electron transport in the mesoscopic system in the last few years is reviewed and introduced. Different material of the electrode in the quantum dot system has different feature and application in transport. At last, shot noise is detail reviewed. In the second chapter, we introduce the non-equilibrium Green’s function more useful methods in mesoscopic systems. First of all, we introduce the based concept and theory. Then, application of the non-equilibrium Green’s function in the shot noise and phonon-electron interaction’s system are introduced.Our main work is content of the third chapter, fourth chapter and fifth chapter. In the third chapter, the shot noise of a quantum dot embedded in A-B interferometer under the perturbation of microwave field is investigated. Interference and correlation of the electrons induce the asymmetric resonant peak-valley behavior of the shot noise. The enhancement and suppression of the shot noise are resulting from the competition of incoherent correlation and destructive interference effects, and super-Poissonian and sub-Poissonian noise can be adjusted by the applied photon irradiation, gate-voltage and direct tunneling strength. In the fourth chapter, we investigate the quantum dot under the rotating and oscillating magnetic fields. Shot noise is enhanced from sub-Poissonian to super-Poissonian noise due to the application of the rotating magnetic field(RMF) and oscillating magnetic field(OMF), and it is controlled sensitively by the tilt angle θ of RMF. The magnitude of shot noise is increase as the photon energy ω of OMF, and its valley eventually is reversed to peaks as the photon energy large enough. Double-peak structure of Fano factor is exhibited as the frequency of OMF increase to cover a large regime. The Zeeman energy μ0B0acts as an effective gate voltage to exhibit resonant behavior, and novel peak emerges associated with the applied OMF. In fifth chapter, we study ferromagnetic electrodes coupling with molecular quantum dot under the microwave field in the Coulomb blockade regime. Finding that phonon peaks is only position at the right of the main-resonant peaks different to photon peaks. Compared to only the photon’s case, phonon-electron interaction induce the shot noise of system decrease.As the phonon energy increase, the shot noise is decrease, and large regime of bias eV and gate voltage eVgis sub-Possion noise.