Electronic Transpotr Research For2D-systems

Firstly，we introduce briefly the mesoscopic physics and Landauer-Buttiker transporttheory. We give the conductance fonnula of two models at zero-temperature, The relationof conductivity and temperature is given too. A brief descirption of the peculiar quantumeffects and phenomena of mesoscopic physics，as well as its potential scientificsigniifcance and application value, are discussed.Secondly，the electronic transport for2D-systems is studied, which contains a pair ofinterlaced scatteirng impurity. This work is based on the scatteirng matrix theory. It showsthat the conductance of the system depends on the size of the impurity. At zerotemperature, the conductance is quantized and has the steps form with the energy increaseor the channel increase. The conductance is sharply reduced with the length of thescatteirng impurities firstly, but with the length increased to a certain degree, theconductance changes to a quasi-cyclical vibration. At non-zero temperature, theconductance irses like the steps form also, but it is out of lfatness. The conductancedecreases with the rise of the temperature. In the mean while, the properties of the electronprobability in the two dimensional system are discussed.Finally, we study the properties of the electronic transport for2D-system，whichcontains a number of interlaced scattering impurities. The phenomena are similar to theproperties of a pair of interlaced scattering impurity. The vibrance of the conductance ismore intensely. If the number of impurity increases，the conductance reduces sharplyfirstly, but with the number of the impurities increasing to a certain degree, theconductance changes to a quasi-cyclical volatility, which is similar to the result in thesingle impurity.