RESONANCE PATTERN IN ELECTRONIC TRANSMITTANCE FOR 2 IDENTICAL COUPLEDRANDOM-DIMER CHAINS UNDER DIFFERENT LEAD CONFIGURATIONS

Electronic transmittance vs energy for two identical coupled random-di mer chains is investigated within the Anderson tight-binding model. Th e electronic transmittance is calculated by using the Block recursion algorithm proposed by Godin and Haydock. The single-chain random-dimer result such as occurrence of band of nonscattered states is recovered for very small interchain hopping parameter. The transmittance vs ene rgy curve shows a resonance pattern, which is highly sensitive to both interchain hopping and lead positions. Even for the moderate intercha in hopping the band of nonscattered states gets modified by appearance of strong fluctuations or irregular dips leading to a new pattern for the transmittance vs energy curve.