Angela Hight Walker3,Linsey Rodenbach1,2,Alireza Panna3,Shamith Payagala3,Ilan Rosen1,2,Joseph Hagmann3,Peng Zhang4,Lixuan Tai4,Kang Wang4,Dean Jarrett3,Randolph Elmquist3,Jason Underwood3,David Newell3,Albert Rigosi3,David Goldhaber-Gordon1,2
Stanford University1,SLAC National Accelerator Laboratory2,National Institute of Standards and Technology3,University of California, Los Angeles4
Angela Hight Walker3,Linsey Rodenbach1,2,Alireza Panna3,Shamith Payagala3,Ilan Rosen1,2,Joseph Hagmann3,Peng Zhang4,Lixuan Tai4,Kang Wang4,Dean Jarrett3,Randolph Elmquist3,Jason Underwood3,David Newell3,Albert Rigosi3,David Goldhaber-Gordon1,2
Stanford University1,SLAC National Accelerator Laboratory2,National Institute of Standards and Technology3,University of California, Los Angeles4
Since 2017, epitaxial graphene has been the base material for the US national standard for resistance. Due to a relaxed magnetic field and temperature requirement, these graphene-based devices enabled more user-friendly access to the quantum Hall effect and could more easily be deployed into US and global industries compared to GaAs-based devices. A future avenue of research within electrical metrology is to remove the need for strong magnetic fields, as is currently the case for devices exhibiting the quantum Hall effect. New materials, like magnetically doped topological insulators (MTIs), offer access to the quantum anomalous Hall effect, which in its ideal form, could become a future resistance standard needing only a small permanent magnet to activate a quantized resistance value. Furthermore, these devices could operate at zero-field for measurements, making the dissemination of the ohm more economical and portable. Here we present results on precision measurements of the h/e^2 quantized plateau of Cr-Doped (Bi<sub>x</sub>Sb<sub>1-x</sub>)<sub>2</sub>Te<sub>3</sub> and give them context by comparing them to modern graphene-based resistance standards. Ultimately, MTI-based devices could be combined in a single system with magnetic-field-averse Josephson voltage standards to obtain an alternative quantum current standard.<br/> <br/><b>This material is based upon work supported by the Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract DE-AC02-76SF00515.</b>