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Updated: Aug 8, 2025

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
Negative transverse magnetoresistance due to the negative off-diagonal mass in linear dispersion materials
Yudai Awashima1, Yuki Fuseya1,2
1Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
Abstract:
This study calculated the magnetoresistance (MR) in the Dirac electron system, Dresselhaus-Kip-Kittel (DKK) model, and nodal-line semimetals based on the semiclassical Boltzmann theory, with particular focus on the detailed energy dispersion structure. The negative off-diagonal effective-mass was found to induce negative transverse MR owing to the energy dispersion effect. The impact of the off-diagonal mass was more prominent in case of a linear energy dispersion. Further, Dirac electron systems could realize negative MR even if the Fermi surface was perfectly spherical. The obtained negative MR in the DKK model may explain the long-standing mystery in p-type Si.
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