Analyzing Longitudinal Magnetoresistance Asymmetry to Quantify Doping Gradients: Generalization of the van der Pauw Method

Wang Zhou, H. M. Yoo, S. Prabhu-Gaunkar, L. Tiemann, C. Reichl, W. Wegscheider, M. Grayson

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A longitudinal magnetoresistance asymmetry (LMA) between a positive and negative magnetic field is known to occur in both the extreme quantum limit and the classical Drude limit in samples with a nonuniform doping density. By analyzing the current stream function in van der Pauw measurement geometry, it is shown that the electron density gradient can be quantitatively deduced from this LMA in the Drude regime. Results agree with gradients interpolated from local densities calibrated across an entire wafer, establishing a generalization of the van der Pauw method to quantify density gradients.

Original languageEnglish (US)
Article number186804
JournalPhysical review letters
Volume115
Issue number18
DOIs
StatePublished - Oct 28 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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