Contact person
Naveen Shetty
Forskare
Contact Naveen
The project will further develop the use of graphene for the realization of the unit of resistance. By investigating how contact resistance and component geometry affect the quantum Hall effect, the project will generate knowledge needed for future guidelines, standards and practical use of graphene in quantum metrology.
The quantum Hall effect is used to realize the resistance unit, the ohm. Traditionally, this has been done using materials such as gallium arsenide, but graphene makes it possible to use quantum Hall standards at more practical temperatures, lower magnetic fields and higher currents. In the long term, this could make quantum-based resistance standards simpler, more compact and more accessible, including outside national metrology institutes.
RISE has worked for several years to develop the use of graphene in quantum metrology and is today a world leader in the field. But international guidelines that fully describe how graphene-based components should be designed and used are still lacking. This includes, for example, how high the contact resistance can be before accuracy is affected, and how the dimensions of the components affect the current that can be used.
The project will characterize and standardize important parameters for graphene-based quantum Hall standards. The focus is on two factors that affect how well resistance can be realized: the contact resistance between the metal contact and graphene, and the geometry and length of the components. The project will investigate how these parameters affect the quantum Hall effect and the robustness of the components. The results will be used to develop guidelines and standards for how graphene-based quantum Hall components should be designed and used.
SCOPE
Active
Project leader
2028-12-31
1 296 395 kr
Vinnova