Additivity of the Quantized Conductance of Multiple Parallel Quantum Point Contacts

Abstract

We report on the first direct observation of the additivity of the quantized conductance for multiple parallel quantum point contacts. We have studied from 1 to 4 parallel quantum point contacts and find that the total conductance can be written in the form (2 e 2 N L N QPC / h ) as a function of the applied gate voltage, where N QPC is the number of parallel quantum point contacts. The processing of multiple parallel quantum point structures is also described.