Quantum Transport



Quantum Transport

 

Electrical transport in nanostructures and/or in low temperature differs from what ohmic laws predict.  Quantization of electrical conductance in coherent ballistic transport is one of the most fundamental behaviors in quantum transport. At present the most familiar method for calculation of coherent transport in nanostructures is the Landaur-Butticker formalism. In this formalism we are able to calculate the coherent conductance of a sample which its Hamiltonian is approximated in the tight-binding method.  

In a more advanced formalism known as non-equilibrium Green's function method (also known as Keldish method) we are able to include interaction effects and we can study the incoherent transport and also the transition behavior of the system as a function of time. It is also possible to study the spin transport in such systems. We are interested in applying these formalisms to study the transport in nanostructures such as polymers and biological molecules.

At present we have developed computational programs for calculation of non-equilibrium Green's function results for charge and spin transport through conducting polymers and multiple quantum dot systems.