QUANTUM BOUND-STATES IN A DOUBLE-BEND QUANTUM CHANNEL

By use of the mode-matching technique the quantum bound states in a double-bend quantum channel of finite length connecting to two 2D electron gas reservoirs have been investigated in detail. The conductance G of the quantum system is calculated as a function of Fermi energy and the electron density associated with bound states. It is found that there exists one resonant peak in G corresponding to resonant tunneling via one quasibound state below the first conductance plateau for the quantum channel with double-bend continuity and two resonant peaks in G corresponding to resonant tunneling via two quasibound states which are symmetric and antisymmetric superposition of two local bound states localized at two right-angle bends below the first conductance plateau for the quantum channel with double-bend discontinuity. At finite temperature the results are compared with experimental results and are found to explain them well. © 1995 American Institute of Physics.