Novel circuit design for high-impedance and non-local electrical measurements of two-dimensional materials

The Review of Scientific Instruments
Adolfo De SanctisSaverio Russo

Abstract

Two-dimensional materials offer a novel platform for the development of future quantum technologies. However, the electrical characterisation of topological insulating states, non-local resistance, and bandgap tuning in atomically thin materials can be strongly affected by spurious signals arising from the measuring electronics. Common-mode voltages, dielectric leakage in the coaxial cables, and the limited input impedance of alternate-current amplifiers can mask the true nature of such high-impedance states. Here, we present an optical isolator circuit which grants access to such states by electrically decoupling the current-injection from the voltage-sensing circuitry. We benchmark our apparatus against two state-of-the-art measurements: the non-local resistance of a graphene Hall bar and the transfer characteristic of a WS2field-effect transistor. Our system allows the quick characterisation of novel insulating states in two-dimensional materials with potential applications in future quantum technologies.

References

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Jun 3, 2017·The Review of Scientific Instruments·Adolfo De SanctisSaverio Russo
Nov 4, 2017·Scientific Reports·Francesco RealeCecilia Mattevi

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Citations

Nov 27, 2018·Nano Letters·Adolfo De SanctisSaverio Russo

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