Ballistic Transport in Y-Typed Quantum Channels
Y型量子线中电子弹道输运性质

The quantum mechanical calculations of ballistic transport in finite Y typed quantum channels are carried out.The channels connect to two semi infinite quantum channels,which serve as the emitter and collector respectively when a potential difference is applied.The calculations are based on the transfer matrix method and a truncating approximation.The numerical results show that,when the structure is symmetry related to the x direction,there exist two peaks in the conductance at the energy of electrons less than the eigenvalue of the first transverse mode,and,when the structure is asymmetry related to the x direction,there exist three peaks.It must be pointed out that these peaks are due to the resonant tunneling via bound states in the quantum structure which is a classical unbound system.When the structure is symmetry related to the x direction,the higher energy level has double degeneracy,otherwise the degeneracy of the level is removed.