Simulations of capacitive contacts for magnetotransport characterization

Chuanle Zhou

Northwestern University, USA

The experimental work of N. Isik et al. shows that capacitive contacts can be used for magnetotransport measurements, allowing in principle for measurements of high contact-impedance samples, as well as permitting a 2D electron system to be thermally decoupled from the leads. I used the SPICE circuit simulation software to model these experimental capacitive contact results using an equivalent circuit to simulate four-point Hall bar measurements. By comparing to experiment, improvements in the circuit model were developed. Similarities and differences with the analytical calculations are presented.