Patent ID: 11867775
Assignee: UNIVERSITY OF MARYLAND, COLLEGE PARK
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 11:
12. A method for making a quantum Hall bar resistance apparatus to improve resistance standards, the method comprising:
providing a substrate;
epitaxially growing a graphene to form an electrical conduction layer on the substrate;
etching the graphene to make a plurality of Hall bars, each including a plurality of first contact patterns at edges thereof;
performing lithographic processes to lay a protective layer configured to protect the plurality of first contact patterns; and
adding a plurality of contacts over the protective layer, each contact having a second contact pattern to connect to a corresponding first contact pattern,
wherein the plurality of contacts become a superconductor at a temperature lower than or equal to a predetermined temperature and under up to a predetermined magnetic flux density.