High Q electromechanics with InAs nanowire quantum dots

Hari S. Solanki, Shamashis Sengupta, Sudipta Dubey, Vibhor Singh, Sajal Dhara, Anil Kumar, Arnab Bhattacharya, S. Ramakrishnan, Aashish A. Clerk, Mandar M. Deshmukh

Published 2011-08-16Version 1

In this report, we study electromechanical properties of a suspended InAs nanowire (NW) resonator. At low temperatures, the NW acts as the island of a single electron transistor (SET) and we observe a strong coupling between electrons and mechanical modes at resonance; the rate of electron tunneling is approximately 10 times the resonant frequency. Above and below the mechanical resonance, the magnitude of Coulomb peaks is different and we observe Fano resonance in conductance due to the interference between two contributions to potential of the SET. The quality factor ($Q$) of these devices is observed $\sim10^5$ at 100 mK.