MEMS quantum woodpecker

In an integrated circuit, accuracy of resistors is limited by their cost of calibration, by ageing and thermal drift. A resistance reference with absolute accuracy can be derived from the quantum Hall effect, but that requires a table full of equipment and it is unpractical in any application that should be portable. Instead, we want to demonstrate a quantum resistance standard on a stand-alone chip. Recently [1,2], it has been shown that when gold contacts are pulled apart, they ultimately form single-atom bridges with quantized resistance levels. Those levels only depend on physical constants. Breaking the contact many times enables the acquisition of a robust signal. The aim of this project is to miniaturize the quantum conductance principle into a silicon-based microelectromechanical system (MEMS). The idea is to construct a relay-like structure with a very sharp gold-plated tip. Moreover, electronics will be designed to drive the actuator and read out the quantum conductance.

Assignment

In this project you will:
a) Perform a literature study on quantum conductance, MEMS relays and tips, and readout circuitry.
b) Choose an implementation form based on potential performance, available technology and ease of realization.
c) Design a MEMS structure and cleanroom fabrication process; assist in fabrication.
d) Design readout electronics.
e) Experimentally demonstrate the system.

Contact

dr. Fabio Sebastiano

Electronic Instrumentation Group

Department of Microelectronics

Last modified: 2018-01-26